oss section D AA 30-50% centrality Open Heavy Flavourgrell101/HFDmesonsRAA_JanQMApproval.… ·...
Transcript of oss section D AA 30-50% centrality Open Heavy Flavourgrell101/HFDmesonsRAA_JanQMApproval.… ·...
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
D meson RAA in Pb-Pb, 30-50% centrality
Alessandro Grellifor the D2H group
Open Heavy Flavour at LHC with
ALICE detector
03/12/09 - Pavia Alessandro Grelli
The jet-alignment method
for event mixing
Alessandro Grelli!
ERC-Starting Independent Research Group QGP17/1/2017 Grelli Alessandro
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Outline
Dataset and analysis setup Signal and efficiencies Systematics:
Cut variation yield extraction PID and pT shape η positive vs η negative, low vs high interaction rate Tracking Eloss and feed down
D meson yields RAA vs pT (D0,D+,D*+ and D+s) D meson ratios Conclusions
ARC committee: Cristina Bedda, Philippe Crochet
Analysis Note uploaded here:https://aliceinfo.cern.ch/Notes/node/576
17/1/2017 Grelli Alessandro 1
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Outline
Dataset and analysis setup Signal and efficiencies Systematics:
Cut variation (additional sets for D*+) yield extraction PID and pT shape (D*+ finalized) η positive vs η negative, low vs high interaction rate Tracking (additional checks wrt last week ) Eloss and feed down
D meson yields RAA vs pT (D0,D+,D*+ and D+s) D meson ratios Conclusions
ARC committee: Cristina Bedda, Philippe Crochet
Analysis Note uploaded here:https://aliceinfo.cern.ch/Notes/node/576
17/1/2017 Grelli Alessandro 1
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Analysis setup
Data analysis: LHC15o_pass1 (RunList_LHC15o_pass1_CentralBarrelTracking_hadronPID_20161130_v6)
LHC15o_pass1_pidfix (RunList_LHC15o_pass1_pidfix_Tracklets_20161018_v0)
LHC15o_pass3_lowIR_pidfix (RunList_LHC15o_pass3_lowIR_pidfix_CentralBarrelTracking_hadronPID_20161109_v0)
MC for 2015: LHC16i2b
~24M minimum-bias events analysed (kINT7)
Analysis strategy similar to the one for 2010 RAA paper
pp reference: D-meson pp pass4 analysis (paper plans to be out by QM)
→Results from LEGO train
17/1/2017 Grelli Alessandro 2
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Signal extraction, comparison with MC and efficiencies
Mass plots D0
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 4
MeV
/c
0
500
1000
1500
2000
2500
3000
3500
4000
4500 0.001±Mean = 1.866
0.002±Sigma = 0.011 0.000±ReflOverS = 0.231
1.2 ±) 9.3 σSignificance (3
273 ±) 2043 σS (3
87±) 46267 σB (3
) 0.0442 σS/B (3
<2.0T
1.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 1
2 M
eV/c
0
2000
4000
6000
8000
10000
12000 0.001±Mean = 1.869
0.001±Sigma = 0.013 0.000±ReflOverS = 0.230
1.2 ±) 24.4 σSignificance (3
306 ±) 5966 σS (3
100±) 53733 σB (3
) 0.1110 σS/B (3
<3.0T
2.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2 2.05
2En
trie
s / 1
0 M
eV/c
0
500
1000
1500
2000
2500
3000
3500 0.000±Mean = 1.868
0.000±Sigma = 0.014 0.000±ReflOverS = 0.231
0.9 ±) 32.8 σSignificance (3
152 ±) 4762 σS (3
57±) 16298 σB (3
) 0.2922 σS/B (3
<4.0T
3.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 1
2 M
eV/c
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200 0.001±Mean = 1.868
0.001±Sigma = 0.016 0.000±ReflOverS = 0.207
0.9 ±) 31.2 σSignificance (3
116 ±) 3433 σS (3
45±) 8665 σB (3
) 0.3962 σS/B (3
<5.0T
4.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2 2.05
2En
trie
s / 1
0 M
eV/c
0
100
200
300
400
500
600
700
800
900 0.001±Mean = 1.868
0.001±Sigma = 0.017
0.000±ReflOverS = 0.188
0.8 ±) 29.1 σSignificance (3
78 ±) 2172 σS (3
28±) 3383 σB (3
) 0.6419 σS/B (3
<6.0T
5.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2 2.05
2En
trie
s / 6
MeV
/c
0
50
100
150
200
250
300
350
400 0.001±Mean = 1.868
0.001±Sigma = 0.018
0.000±ReflOverS = 0.178
0.9 ±) 25.6 σSignificance (3
69 ±) 1627 σS (3
25±) 2405 σB (3
) 0.6766 σS/B (3
<7.0T
6.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 1
2 M
eV/c
0
50
100
150
200
250
300
350 0.001±Mean = 1.868
0.001±Sigma = 0.018
0.000±ReflOverS = 0.165
0.8 ±) 21.5 σSignificance (3
45 ±) 908 σS (3
14±) 867 σB (3
) 1.0474 σS/B (3
<8.0T
7.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 1
2 M
eV/c
0
100
200
300
400
500
600 0.001±Mean = 1.870
0.001±Sigma = 0.018
0.000±ReflOverS = 0.160
0.8 ±) 24.8 σSignificance (3
58 ±) 1334 σS (3
20±) 1554 σB (3
) 0.8588 σS/B (3
<10.0T
8.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2 2.05
2En
trie
s / 1
4 M
eV/c
0
20
40
60
80
100
120
140
160
180 0.001±Mean = 1.867
0.001±Sigma = 0.018
0.000±ReflOverS = 0.161
0.7 ±) 17.6 σSignificance (3
28 ±) 485 σS (3
8±) 275 σB (3
) 1.7633 σS/B (3
<12.0T
10.0<p
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2 2.05
2En
trie
s / 1
4 M
eV/c
0
20
40
60
80
100
120
140 0.002±Mean = 1.866
0.002±Sigma = 0.022
0.000±ReflOverS = 0.150
0.8 ±) 14.7 σSignificance (3
30 ±) 397 σS (3
10±) 330 σB (3
) 1.2024 σS/B (3
<16.0T
12.0<p
)2) (GeV/cπInvariant Mass (K1.7 1.8 1.9 2 2.1
2En
trie
s / 1
6 M
eV/c
0
10
20
30
40
50
60
70
80 0.003±Mean = 1.872
0.003±Sigma = 0.022
0.000±ReflOverS = 0.222
0.8 ±) 9.8 σSignificance (3
20 ±) 185 σS (3
8±) 169 σB (3
) 1.0977 σS/B (3
<24.0T
16.0<p
)2) (GeV/cπInvariant Mass (K1.7 1.75 1.8 1.85 1.9 1.95 2
2En
trie
s / 2
6 M
eV/c
0
5
10
15
20
25
30
35
40
45 0.005±Mean = 1.860
0.004±Sigma = 0.023
0.000±ReflOverS = 0.267
0.8 ±) 5.3 σSignificance (3
12 ±) 57 σS (3
5±) 59 σB (3
) 0.9701 σS/B (3
<36.0T
24.0<p
1-2
24-36
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
2-3 3-4 4-5
6-7 7-8 8-10
10-12 12-16 16-24
5-6
17/1/2017 Grelli Alessandro 3
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Mass plots D+
)2 (GeV/cππKM
1.8 1.85 1.9 1.95 2
)2En
tries
/ (8
MeV
/c
0200400600800
10001200140016001800200022002400
< 3.0 (GeV/c)Tp2.0 <
0.001±Mean = 1.869 0.001±Sigma = 0.011
1.1 ±) 10.2 σSignificance (3 151 ±) 1385 σS (3
61±) 16875 σB (3) 0.0820 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2)2
Entri
es /
(10
MeV
/c0
200400600800
1000120014001600180020002200
< 4.0 (GeV/c)Tp3.0 <
0.001±Mean = 1.871 0.001±Sigma = 0.013
1.1 ±) 18.3 σSignificance (3 135 ±) 2116 σS (3
52±) 11260 σB (3) 0.1879 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
0 M
eV/c
0200400600800
10001200140016001800
< 5.0 (GeV/c)Tp4.0 <
0.001±Mean = 1.872 0.001±Sigma = 0.012
1.0 ±) 19.5 σSignificance (3 118 ±) 2022 σS (3 45±) 8727 σB (3
) 0.2317 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
0 M
eV/c
0
200
400
600
800
1000 < 6.0 (GeV/c)
Tp5.0 <
0.001±Mean = 1.871 0.001±Sigma = 0.014
1.0 ±) 18.3 σSignificance (3 89 ±) 1476 σS (3 38±) 5066 σB (3
) 0.2914 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
0 M
eV/c
0
100
200
300
400
500
600
700
800 < 7.0 (GeV/c)
Tp6.0 <
0.001±Mean = 1.871 0.001±Sigma = 0.013
0.9 ±) 17.1 σSignificance (3 71 ±) 1135 σS (3 29±) 3261 σB (3
) 0.3481 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
2 M
eV/c
0
100
200
300
400
500
600 < 8.0 (GeV/c)
Tp7.0 <
0.001±Mean = 1.871 0.001±Sigma = 0.016
0.9 ±) 16.1 σSignificance (3 60 ±) 890 σS (3 25±) 2157 σB (3
) 0.4124 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
2 M
eV/c
0
100
200
300
400
500
600
700 < 10.0 (GeV/c)
Tp8.0 <
0.001±Mean = 1.871 0.001±Sigma = 0.015
0.9 ±) 18.6 σSignificance (3 64 ±) 1111 σS (3 27±) 2464 σB (3
) 0.4511 σS/B (3
)2 (GeV/cππKM
1.7 1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
6 M
eV/c
0
100
200
300
400
500 < 12.0 (GeV/c)
Tp10.0 <
0.001±Mean = 1.870 0.001±Sigma = 0.015
0.8 ±) 15.9 σSignificance (3 43 ±) 666 σS (3 17±) 1090 σB (3
) 0.6112 σS/B (3
)2 (GeV/cππKM
1.7 1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
6 M
eV/c
0
50
100
150
200
250
300
350
400
< 16.0 (GeV/c)Tp12.0 <
0.001±Mean = 1.870 0.001±Sigma = 0.017
0.8 ±) 17.5 σSignificance (3 43 ±) 703 σS (3 17±) 906 σB (3
) 0.7765 σS/B (3
)2 (GeV/cππKM
1.7 1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (1
6 M
eV/c
020406080
100120140160180200
< 24.0 (GeV/c)Tp16.0 <
0.002±Mean = 1.871 0.002±Sigma = 0.021
0.9 ±) 13.7 σSignificance (3 34 ±) 416 σS (3 14±) 508 σB (3
) 0.8177 σS/B (3
)2 (GeV/cππKM
1.75 1.8 1.85 1.9 1.95 2
)2En
tries
/ (2
0 M
eV/c
0
10
20
30
40
50
60
70 < 36.0 (GeV/c)
Tp24.0 <
0.003±Mean = 1.869 0.003±Sigma = 0.018
0.8 ±) 6.2 σSignificance (3 15 ±) 93 σS (3
7±) 136 σB (3) 0.6859 σS/B (3
2-3
24-36
3-4 4-5 5-6
6-7 7-8 8-10 10-12
12-16 16-24
17/1/2017 Grelli Alessandro 4
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Mass plots D*+
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
100
200
300
400
500
0.000 Mean = 0.145 0.000 Sigma = 0.001
1.0 ) 3.2 Significance (3 49 ) 150 S (3 13 ) 2047 B (3
) 0.0734 S/B (3
< 2 (GeV/cT
1 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
100
200
300
400
500
600
700
800
900
0.000 Mean = 0.145 0.000 Sigma = 0.000
1.0 ) 4.6 Significance (3 57 ) 240 S (3 12 ) 2537 B (3
) 0.0945 S/B (3
< 3 (GeV/c)T
2 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
200
400
600
800
1000
1200
1400
1600
1800
0.000 Mean = 0.145 0.000 Sigma = 0.001
1.2 ) 7.8 Significance (3 102 ) 648 S (3
21 ) 6226 B (3) 0.1041 S/B (3
< 4 (GeV/cT
3 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
20
40
60
80
100
120
140
160
180
200
220
240
0.000 Mean = 0.145 0.000 Sigma = 0.001
1.1 ) 11.7 Significance (3 48 ) 443 S (3 8 ) 994 B (3
) 0.4457 S/B (3
< 5 ( GeV/cT
4 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
20
40
60
80
100
120
140
160
0.000 Mean = 0.145 0.000 Sigma = 0.001
0.9 ) 11.3 Significance (3 30 ) 313 S (3 6 ) 458 B (3
) 0.6820 S/B (3
< 6 (GeV/cT
5 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
20
40
60
80
100
120
140
0.000 Mean = 0.145 0.000 Sigma = 0.001
0.8 ) 12.0 Significance (3 28 ) 311 S (3 5 ) 361 B (3
) 0.8619 S/B (3
< 7 (GeV/cT
6 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
10
20
30
40
50
60
70
80
90 0.000 Mean = 0.145 0.000 Sigma = 0.001
0.9 ) 10.4 Significance (3 24 ) 215 S (3 4 ) 210 B (3
) 1.0202 S/B (3
< 8 (GeV/cT
7 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
20
40
60
80
100
120
0.000 Mean = 0.145 0.000 Sigma = 0.001
0.8 ) 14.2 Significance (3 27 ) 358 S (3 4 ) 275 B (3
) 1.2988 S/B (3
< 10 (GeV/cT
8 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
10
20
30
40
50
60
70 0.000 Mean = 0.146 0.000 Sigma = 0.001
0.7 ) 12.1 Significance (3 18 ) 204 S (3 2 ) 80 B (3
) 2.5349 S/B (3
< 12 (GeV/cT
10 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
10
20
30
40
50
60
70
0.000 Mean = 0.145 0.000 Sigma = 0.001
0.7 ) 11.1 Significance (3 15 ) 162 S (3 2 ) 49 B (3
) 3.3070 S/B (3
< 16 (GeV/cT
12 < p
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
2
4
6
8
10
12
14
16
18
2022
24
0.000 Mean = 0.146 0.000 Sigma = 0.001
0.7 ) 7.2 Significance (3 10 ) 68 S (3 2 ) 22 B (3
) 3.0814 S/B (3
16 < pT < 24 (GeV/c
0.14 0.142 0.144 0.146 0.148 0.15 0.152 0.1540
5
10
15
20
25
0.000 Mean = 0.145 0.000 Sigma = 0.001
0.6 ) 7.9 Significance (3 10 ) 70 S (3 1 ) 9 B (3
) 8.0544 S/B (3
< 36 (GeV/c)T
24 < p
1-2
24-36
2-3 3-4
4-5 5-6 6-7
7-8 8-10 10-12
12-16 16-24
17/1/2017 Grelli Alessandro 5
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Mass plots Ds
)2) (GeV/c M(KK1.8 1.9 2 2.1
2En
tries
/ 13
MeV
/c
20406080
100120140160180
c<4 GeV/T
p2<
2 0.003 GeV/c = 1.969 2 0.000 GeV/c = 0.010
17 S = 79 6 ) = 259 B (3
) 0.3061 S/B = (3 0.8 ) = 4.3 Signif (3
)2) (GeV/c M(KK1.8 1.9 2 2.1
2En
tries
/ 13
MeV
/c0
50
100
150
200
250
c<6 GeV/Tp4<
2 0.003 GeV/c = 1.970 2 0.000 GeV/c = 0.011
20 S = 127 8 ) = 355 B (3
) 0.3574 S/B = (3 0.8 ) = 5.8 Signif (3
)2) (GeV/c M(KK1.8 1.9 2 2.1
2En
tries
/ 15
MeV
/c
50
100
150
200
250
300
c<8 GeV/Tp6<
2 0.002 GeV/c = 1.966 2 0.000 GeV/c = 0.012
24 S = 150 11 ) = 581 B (3
) 0.2591 S/B = (3 0.8 ) = 5.6 Signif (3
)2) (GeV/c M(KK1.8 1.9 2 2.1
2En
tries
/ 13
MeV
/c
0
20
40
60
80
100
120 c<12 GeV/Tp8<
2 0.002 GeV/c = 1.968 2 0.000 GeV/c = 0.013
16 S = 136 6 ) = 152 B (3
) 0.8966 S/B = (3 0.7 ) = 8.0 Signif (3
)2) (GeV/c M(KK1.8 1.9 2 2.1
2En
tries
/ 15
MeV
/c
10
20
30
40
50 c<16 GeV/Tp12<
2 0.003 GeV/c = 1.969 2 0.000 GeV/c = 0.015
10 S = 58 3 ) = 37 B (3
) 1.5657 S/B = (3 0.7 ) = 5.9 Signif (3
2-4
12-16
4-6 6-8
8-12
17/1/2017 Grelli Alessandro 6
Width: comparison data-MC
Pt (GeV/c)5 10 15 20 25 30 35
)2
Sig
ma (
GeV
/c
0.0002
0.0004
0.0006
0.0008
0.001
0.0012
0.0014
Data
MC
)c (GeV/T
p5 10 15 20 25 30 35
Sigm
a
0
0.01
0.02
0.03
0.04MC
data
(GeV/c)Tp
5 10 15 20 25 30 35
)2w
idth
(GeV
/c
68
101214161820222426
3−10×
Data
MC
)2Sigma (GeV/c2 4 6 8 10 12 14 16
)2Si
gma
(GeV
/C
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
Peak width
FreeMC+15%MC
Peak width
)2Mass (GeV/c2 4 6 8 10 12 14 16
)2M
ean
(GeV
/C
1.962
1.964
1.966
1.968
1.97
1.972
1.974
1.976
Peak position
DataMCPDG
Peak position
D0 D+
D*+ Ds
Plots with position in data and MC in backup!
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 817/1/2017 Grelli Alessandro 7
Efficiencies
5 10 15 20 25 30 35
Effic
ienc
y
2−10
1−10
0Prompt D
0Feed-down D
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.20.40.60.811.21.41.61.822.22.4
(GeV/c)Tp
5 10 15 20 25 30 35fid
effic
ienc
y x
acce
ptan
ce x
2y
2−10
1−10
+Prompt D (w/o PID)+Prompt D
+Feed-down D
Pt (GeV/c)5 10 15 20 25 30 35
Effic
ienc
y x
Acce
ptan
ce
4 10
3 10
2 10
1 10
1
PromptFeed-down
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
D+D0
D*+
Efficiencies range from 0.1 to 60% depending on pT
and meson
Results “reasonably” smooth versus pT. Remember we use pT dependent topological cuts!
pt2 4 6 8 10 12 14 16
3 10
2 10
1 10
(PID)sPrompt D
(PID)sFeed-down D
Ds
17/1/2017 Grelli Alessandro 8
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Systematics
Cut variation
Pt (GeV/c)5 10 15 20 25 30 35
cros
s se
ctio
n ra
tio0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2loose 5%tight 5%loose 10%tight 10%loose 15%tight 15%loose 20%tight 20%
5 10 15 20 25 30 35
Raa
_ref
.Nb
0
0.5
1 centrallosser1losser2tighter1tighter2
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.70.80.9
11.11.21.31.4
D0 and D*+ as example, D+ and Ds results in the Analysis note!.
We vary our cuts of 20% with respect the standard set in both directions and in steps of 5%. For each step we check the agreement of our final results
Typically 0-10% depending on pT
D0
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Pt (GeV/c)5 10 15 20 25 30 35
prom
pt ra
tio
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2tight 5%loose 5%tight 10%loose 10%tight 15%loose 15%tight 20%loose 20%
step9 projection pt projection pt
D*+
efficiency variation
dN/dpT ratio in Pb-Pb
17/1/2017 Grelli Alessandro 9
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Yield extraction
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
800100012001400160018002000220024002600
< 3 (GeV/c)Tp2 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 3 (GeV/c)Tp2 <
raw yield1000 1200 1400 1600 1800 2000
Entri
es
0
50
100
150
200
250
300
< 3 (GeV/c)Tp2 <
mean = 1324.8RMS = 74.6 (5.4%)
= 122.6 (8.8%)12
max-min
mean = 1444.9RMS = 100.3 (7.2%)
= 173.1 (12.5%)12
max-min
mean = 1397.7RMS = 84.0 (6.1%)
= 144.3 (10.4%)12
max-min
< 3 (GeV/c)Tp2 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.006
0.008
0.01
0.012
0.014
0.016
< 3 (GeV/c)Tp2 < < 3 (GeV/c)
Tp2 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2 χ
00.20.40.60.8
11.21.41.61.8
2 < 3 (GeV/c)
Tp2 < < 3 (GeV/c)
Tp2 <
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
1500
2000
2500
3000
3500
4000 < 4 (GeV/c)
Tp3 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 4 (GeV/c)Tp3 <
raw yield1400 1600 1800 2000 2200 2400 2600 2800 3000
Entri
es
0
50
100
150
200
250
300
< 4 (GeV/c)Tp3 <
mean = 1947.4RMS = 127.7 (6.0%)
= 209.5 (9.9%)12
max-min
mean = 2116.3RMS = 177.3 (8.4%)
= 264.6 (12.5%)12
max-min
mean = 2042.3RMS = 121.9 (5.7%)
= 220.5 (10.4%)12
max-min
< 4 (GeV/c)Tp3 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.008
0.01
0.012
0.014
0.016
0.018
< 4 (GeV/c)Tp3 < < 4 (GeV/c)
Tp3 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2 χ
00.20.40.60.8
11.21.41.61.8
2 < 4 (GeV/c)
Tp3 < < 4 (GeV/c)
Tp3 <
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
1000
1500
2000
2500
3000
3500
< 5 (GeV/c)Tp4 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 5 (GeV/c)Tp4 <
raw yield1400 1600 1800 2000 2200 2400 2600 2800 3000
Entri
es
0
50
100
150
200
250
300
350
< 5 (GeV/c)Tp4 <
mean = 1920.1RMS = 104.1 (5.1%)
= 168.6 (8.3%)12
max-min
mean = 2070.7RMS = 166.7 (8.2%)
= 242.3 (12.0%)12
max-min
mean = 1991.7RMS = 120.3 (5.9%)
= 189.7 (9.4%)12
max-min
< 5 (GeV/c)Tp4 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.008
0.01
0.012
0.014
0.016
0.018 < 5 (GeV/c)
Tp4 < < 5 (GeV/c)
Tp4 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2χ
00.20.40.60.8
11.21.41.61.8
2 < 5 (GeV/c)
Tp4 < < 5 (GeV/c)
Tp4 <
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
8001000120014001600180020002200240026002800
< 6 (GeV/c)Tp5 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 6 (GeV/c)Tp5 <
raw yield1000 1200 1400 1600 1800 2000 2200
Entri
es
0
50
100
150
200
250
300
350
400
< 6 (GeV/c)Tp5 <
mean = 1384.0RMS = 71.7 (4.8%)
= 115.4 (7.8%)12
max-min
mean = 1511.9RMS = 123.9 (8.4%)
= 169.2 (11.4%)12
max-min
mean = 1405.0RMS = 86.5 (5.8%)
= 146.2 (9.9%)12
max-min
< 6 (GeV/c)Tp5 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.008
0.01
0.012
0.014
0.016
0.018
0.02
< 6 (GeV/c)Tp5 < < 6 (GeV/c)
Tp5 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2 χ
00.20.40.60.8
11.21.41.61.8
2 < 6 (GeV/c)
Tp5 < < 6 (GeV/c)
Tp5 <
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
600
800
1000
1200
1400
1600
< 8 (GeV/c)Tp7 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 8 (GeV/c)Tp7 <
raw yield600 700 800 900 1000 1100 1200 1300
Entri
es
0
100
200
300
400
500
< 8 (GeV/c)Tp7 <
mean = 872.7RMS = 56.4 (6.3%)
= 69.5 (7.8%)12
max-min
mean = 872.9RMS = 43.8 (4.9%)
= 74.2 (8.3%)12
max-min
mean = 911.7RMS = 33.0 (3.7%)
= 51.0 (5.7%)12
max-min
< 8 (GeV/c)Tp7 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.008
0.01
0.012
0.014
0.016
0.018
0.02
0.022
< 8 (GeV/c)Tp7 < < 8 (GeV/c)
Tp7 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2 χ
00.20.40.60.8
11.21.41.61.8
2 < 8 (GeV/c)
Tp7 < < 8 (GeV/c)
Tp7 <
Trial #0 200 400 600 800 1000 1200 1400 1600
raw
yie
ld
600
800
1000
1200
1400
1600
1800
2000
2200 < 7 (GeV/c)
Tp6 <
Central valueFit method
)σBin counting (5.0)σBin counting (3.0
< 7 (GeV/c)Tp6 <
raw yield800 1000 1200 1400 1600
Entri
es
0
100
200
300
400
500
600
700
800
< 7 (GeV/c)Tp6 <
mean = 1114.3RMS = 27.5 (2.4%)
= 65.0 (5.7%)12
max-min
mean = 1151.4RMS = 47.8 (4.2%)
= 82.8 (7.3%)12
max-min
mean = 1134.3RMS = 34.8 (3.1%)
= 71.0 (6.2%)12
max-min
< 7 (GeV/c)Tp6 <
Trial #0 200 400 600 800 1000 1200 1400 1600
)2w
idth
(GeV
/c
0.008
0.01
0.012
0.014
0.016
0.018
< 7 (GeV/c)Tp6 < < 7 (GeV/c)
Tp6 <
Trial #0 200 400 600 800 1000 1200 1400 1600
2 χ
00.20.40.60.8
11.21.41.61.8
2 < 7 (GeV/c)
Tp6 < < 7 (GeV/c)
Tp6 <
D+
Multi trial fit procedure: different bin widths different fit ranges different background shapes free width parameters fixed width parameters to MC values fixed mean parameters to MC values fit rejected if chi2/ndf>2uncertainty evaluated as rms of raw yield distributionscentral value of the raw yield compatible with mean of yielddistributions within uncertainty-> no shift bin counting signal extraction
Typically 2-20% depending on meson and pT
https://indico.cern.ch/event/597358/contributions/2417713/attachments/1393183/2122972/PF_170110.pdf
For more details see the PF presentation:
17/1/2017 Grelli Alessandro 10
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
PID systematic
(GeV/c)Tp
5 10 15 20 25 30 35
(w/o
PID
)TpddN
(with
PID
) /
TpddN
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
)c (GeV/T
p5 10 15 20 25 30 35
PID
/ no
PID
0.5
1
1.5PID efficiency from Data
PID efficiency from MC
pt (GeV/c)5 10 15 20 25 30
Eff_
data
/Eff_
MC
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
PID syst: Data/MC
from fit: 0.9994
D0
D*+
D+
Using 3 sigma strategy in TOF and TPC. For Ds the number of sigmas in TOF is reduced to 2.
Comparison of the corrected yield without and with PID or of the PID efficiencies in data and MC (D*+)
Negligible in the whole pT range
17/1/2017 Grelli Alessandro 11
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
pT-shape
pt5 10 15 20 25 30 35 40 45 500.9
0.92
0.94
0.96
0.98
1
1.02
1.04
1.06
1.08
1.1
RecoPID: projection on pt
D*+
D*+ and D0 as example.
Evaluated as the ratio of the shapes obtained re-weighting pithya by using BAMPSxFONLL and FONLL
Typically extremely small, of the order of 0-1% above 3 Gev/c but non negligible at low pT: 5-10% below 3 GeV/c, depending on the meson
5 10 15 20 25 30 35
Prom
pt e
ffici
ency
2−10
1−10
FONLL+BAMPS weight(default)
FONLL weight
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.981
1.021.041.061.08
1.11.121.141.161.18
D0
17/1/2017 Grelli Alessandro 12
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
η positive vs η negativepositive and negative eta check
Xinye D2H meeting 1
5 10 15 20 25 30 35
Raa
_ref
.Nb
0
0.5
1central
negative eta
postive eta
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.20.40.60.8
11.21.41.61.8
fix the sigma to MC
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2E
ntr
ies
/ 4
Me
V/c
0
200
400
600
800
1000 0.003±Mean = 1.864 0.000±Sigma = 0.012
0.000±ReflOverS = 0.237
0.8 ±) 4.6 σSignificance (3 88 ±) 470 σS (3
41±) 9842 σB (3) 0.0477 σS/B (3
<2.0T
1.0<p
negative eta
positive and negative eta check
Xinye D2H meeting 1
5 10 15 20 25 30 35
Raa
_ref
.Nb
0
0.5
1central
negative eta
postive eta
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.20.40.60.8
11.21.41.61.8
fix the sigma to MC
)2) (GeV/cπInvariant Mass (K1.75 1.8 1.85 1.9 1.95 2
2E
ntr
ies / 4
MeV
/c
0
200
400
600
800
1000 0.003±Mean = 1.864 0.000±Sigma = 0.012
0.000±ReflOverS = 0.237
0.8 ±) 4.6 σSignificance (3 88 ±) 470 σS (3
41±) 9842 σB (3) 0.0477 σS/B (3
<2.0T
1.0<p
negative eta
We repeated the D0 analysis (the one among D analyses with the highest statistical precision) splitting it in positive and negative η. The comparison with respect the full η analysis does not show any “visible” effect.
Some tension in the bin 1-2 but most probaly is a statistical fluctuation
D0
17/1/2017 Grelli Alessandro 13
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Low vs high interaction rate
We checked the results vs the high and low interaction rate runs.
The final RAA in all the 3 cases looks well compatible. Some fluctuation at high pT but it may well be due to the very large stastistical error
low or high interaction rate check
Xinye D2H meeting 3
5 10 15 20 25 30 35
Raa
_ref
.Nb
0.5
1central(24.6M normalized events)
low interaction rate(10.9M normalized events)
high interaction rate(13.4M normalized events)
)c (GeV/Tp
5 10 15 20 25 30 35R
atio
0.80.9
11.11.2
fix the sigma to MC
5 10 15 20 25 30 35
Prom
pt e
ffici
ency
2−10
1−10
mixed allhigh ratelow rate
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.940.960.98
11.021.041.06
D0
low or high interaction rate check
Xinye D2H meeting 4
5 10 15 20 25 30 35
sign
al/e
nv
5−10
4−10
central
low rate runs
high rate runs
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.60.70.80.9
11.11.21.31.41.5 5 10 15 20 25 30 35
Back
grou
nd/e
nv
5−10
4−10
3−10
central
low rate runs
high rate runs
)c (GeV/Tp
5 10 15 20 25 30 35R
atio
0.60.70.80.9
11.11.21.31.41.5
raw signal vs pT RAA vs pT
17/1/2017 Grelli Alessandro 14
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Tracking systematic (additional checks)
17/1/2017 Grelli Alessandro 15
The method to estimate the systematic on tracking for the D meson analyses was explained in detail at the last forum
https://indico.cern.ch/event/597358/contributions/2417713/attachments/1393183/2122972/PF_170110.pdf
track efficiency check
Xinye D2H meeting 2
5 10 15 20 25 30 35
Raa
_ref
.Nb
0
0.5
1central
Crossed rows/findable cls = 0.9
-depT
Crossed row TPC p
TPC cls/crossed rows = 0.65
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.960.98
11.021.041.06 5 10 15 20 25 30 35
Raa
_ref
.Nb
0
0.5
1centralCrossed rows/findable cls = 0.9
-dep T
pCrossed row TPC TPC cls/crossed rows = 0.65
)c (GeV/Tp
5 10 15 20 25 30 35
Rat
io
0.970.980.99
11.011.021.031.04
fix the sigma to MC
~1% per track is OK
three variations: 1. stdcuts +TPC crossed rows > 120 - (5/pT) 2. stdcuts +TPC N clusters > 0.5 * TPC crossed rows 3. stdcuts +TPC crossed rows/TPC findable clusters > 0.9
Additional checks, on the variation of the track quality selections, were performed in the last week. The checks confirmed a ~1% per track from this source, to be added to the ITS-TPC matching efficiency.
D0
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Feed down systD meson nuclear modification factor in Pb–Pb collisions at
psNN = 5.02 TeV in 30- . . . 47
prompt)AAR feed-down)/(AARHypothesis on (1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
pro
mpt
(%)
AAR
Rel
ativ
e va
riatio
n of
20−
15−
10−
5−
0
5
10
15
20
c<3 GeV/Tp2<
c<4 GeV/Tp3<
c<6 GeV/Tp5<
c<8 GeV/Tp7<
c<16 GeV/Tp12<
c<24 GeV/Tp16<
ALICE = 5.02 TeVNNsPb-Pb, 30-50%,
meson+D
prompt)AAR feed-down)/(AARHypothesis on (1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
pro
mpt
(%)
AAR
Rel
ativ
e va
riatio
n of
20−
15−
10−
5−
0
5
10
15
20
c<3 GeV/Tp2<
c<4 GeV/Tp3<
c<6 GeV/Tp5<
c<8 GeV/Tp7<
c<16 GeV/Tp12<
ALICE = 5.02 TeVNNsPb-Pb, 30-50%,
meson+D
Figure 46: D+: Variation of the R
prompt
AA as a function of the hypothesis on R
feed�downAA /R
promptAA in the varius pT bins.
In the left panel is shown the result obtained applying the default set of topological selections, while in the rightone the cuts on d
xy
0 and |d0 �d
exp
0 |prong(ns) were not applied.
prompt)AAR feed-down)/(AARHypothesis on (
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
pro
mp
t (%
)A
AR
Re
lativ
e v
aria
tion
of
20−
15−
10−
5−
0
5
10
15
20
c<2 GeV/T
p1<c<3 GeV/
Tp2<
c<5 GeV/T
p4<c<7 GeV/
Tp6<
c<12 GeV/T
p10<c<16 GeV/
Tp12<
c<36 GeV/T
p24<
ALICE = 5.02 TeVNNsPb-Pb, 30-50%,
meson0D
Figure 47: D0: Systematic uncertainty from feed-down and R
f eed�down
AA hypothesis in the varius pT bins.
8 D meson corrected yield in Pb–Pb collisions561
Once the invariant mass analysis is performed and the efficiencies and B feed-down studied we can562
correct our raw yield to extract the fully corrected yield in our PbPb sample. In figures 49, 50, and 51563
the corrected yield of D0, D+ and Ds is compared with the proton-proton reference scaled by TAA.564
(GeV/c)T
p2 4 6 8 10 12
0.8
0.85
0.9
0.95
1
1.05
promptf
Feed-down systematics
21
(GeV/c)Tp
5 10 15 20 25 30 35
prom
ptf
0
0.2
0.4
0.6
0.8
1
1.2
)c (GeV/Tp
0 2 4 6 8 10 12 14 16 18 20 22
prom
ptf
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
D+D0
prompt)AAR feed-down)/(AARHypothesis on (0.5 1 1.5 2 2.5 3
pro
mpt
(%)
AAR
Rel
ativ
e va
riatio
n of
20−
15−
10−
5−
0
5
10
15
20
c<4 GeV/Tp2<
c<6 GeV/Tp4<
c<8 GeV/Tp6<
c<12 GeV/Tp8<
ALICE = 2.76 TeVNNsPb-Pb, 30-50%,
meson+sD
Systematic on RAA in 30-50% vs hypothesis on the B feed-down
prompt)AAR feed-down)/(AARHypothesis on (1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
pro
mpt
(%)
AAR
Rel
ativ
e va
riatio
n of
20−
15−
10−
5−
0
5
10
15
20
c<3 GeV/Tp2<
c<4 GeV/Tp3<
c<6 GeV/Tp5<
c<8 GeV/Tp7<
c<16 GeV/Tp12<
c<24 GeV/Tp16<
ALICE = 5.02 TeVNNsPb-Pb, 30-50%,
meson+D
1 < Rb/Rc < 3 for non-strange D 1/3 < Rb/Rc < 3 for Ds
prompt fraction
Ds
D+sD+
D0
D0 D+ Ds
17/1/2017 Grelli Alessandro 16
D*+
Prompt fraction >80% in the whole pt range.
For non strange D mesons 1<RAAc/RAAb<3 with central value 2. For Ds RAAb = RAAc and 1/3<RAAc/RAAb<3
Prompt fraction
prompt)AAR feed-down)/(AARHypothesis on (1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
pro
mpt
(%)
AAR
Rel
ativ
e va
riatio
n of
20
15
10
5
0
5
10
15
20
c<2 GeV/Tp1<
c<3 GeV/Tp2<
c<5 GeV/Tp4<
c<7 GeV/Tp6<
c<12 GeV/Tp10<
c<16 GeV/Tp12<
c<36 GeV/Tp24<
ALICE = 5.02 TeVNNsPb-Pb, 30-50%,
meson0D
D0 as example
Typically 5-15% depending on meson and pT
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
dN/dpT, RAA and D meson ratios
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
D mesons - dN/dpT
)c (GeV/T
p0 5 10 15 20 25 30 35
)c
(1
/Ge
V/
|<0
.5y ||
Tp
/dNd
6−10
5−10
4−10
3−10
2−10
1−10
1
10
Centrality 30-50
p-p rescaled reference
6% norm. unc. not shown)±(
Pb-Pb
Syst. unc. from Data
Syst. unc. from FONLL feed-down corr.
feed-downAARSyst. unc. from
= 5.02 TeVNNs +ALICE D
)c (GeV/T
p0 5 10 15 20 25 30 35
)c
(1
/Ge
V/
|<0
.5y ||
Tp
/dNd
6−10
5−10
4−10
3−10
2−10
1−10
1
10
Centrality 30-50
p-p rescaled reference
6% norm. unc. not shown)±(
Pb-Pb
Syst. unc. from Data
Syst. unc. from FONLL feed-down corr.
feed-downAARSyst. unc. from
= 5.02 TeVNNs +sALICE D
)c (GeV/Tp
0 5 10 15 20 25 30 35
)c (1
/GeV
/|<
0.5
y || Tp/d
Nd
6−10
5−10
4−10
3−10
2−10
1−10
1
10
Centrality 30-50
p-p rescaled reference 6% norm. unc. not shown)±(
Pb-Pb
Syst. unc. from Data
Syst. unc. from FONLL feed-down corr.
feed-downAARSyst. unc. from
= 5.02 TeVNNs 0ALICE D
Preliminary requests
D mesons pp reference using the scaled pp 7 TeV pass4 results (factor about 2 reduced systematics, extended pT range and improved statistical precision).
D0 D+ D*+
Ds
https://aliceinfo.cern.ch/ArtSubmission/sites/aliceinfo.cern.ch.ArtSubmission/files/draft/cterrevo/2016-Dec-21-paper_draft-Dpp7pass4_20Dec2016.pdf
17/1/2017 Grelli Alessandro 17
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
D mesons RAA : 30-50%
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
|<0.5y meson,|+Dtotal syst. uncertaintiespp reference syst. uncertainties[ ]
ALICE Preliminary = 5.02 TeVNNsPb-Pb,
30-50% centrality
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.5
1
1.5
2
2.5
3
3.5
|<0.5y meson,|s+D
total syst. uncertaintiespp reference syst. uncertainties[ ]
ALICE Preliminary = 5.02 TeVNNsPb-Pb,
30-50% centrality
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
|<0.5y meson,|0Dtotal syst. uncertaintiespp reference syst. uncertainties[ ]
ALICE Preliminary = 5.02 TeVNNsPb-Pb,
30-50% centrality
Preliminary requests
We would remove the D* in 1-2 GeV/c from the preliminary since the efficiency is <10^-3. We aim to work on it for the final.
We would remove the Ds in 2-4 GeV/c from the preliminary due to yield extraction not stable, efficiencies very low as well as S/B. We aim to work on it for the final.
17/1/2017 Grelli Alessandro 18
https://indico.cern.ch/event/604215/
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Comparison with 2011 results
17/1/2017 Grelli Alessandro 19
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
= 5.02 TeVNNs
= 2.76 TeVNNs
Total syst.
|<0.5y, |±*Prompt D30-50% centrality
30
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
= 5.02 TeVNNs
= 2.76 TeVNNs
Total syst.
|<0.5y, |±Prompt D30-50% centrality
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
= 5.02 TeVNNs
= 2.76 TeVNNs
Total syst.
|<0.5y, |0D, 0Prompt D30-50% centrality
) c (GeV/Tp
0 5 10 15 20 25 30 35 40
pro
mpt
DAA
R
0
0.5
1
1.5
2
2.5
3
3.5
= 5.02 TeV, centrality 30-50%NNs
= 2.76 TeV, centrality 20-50%NNs
Total syst.
|<0.5y, |s±Prompt D
RAA in 30-50%: 2.76 vs 5.02 TeV
Good agreement even only at statistical error level in the whole pt range
The comparison make clear the large improvement in statistical and systematic precision with 2015 sample
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
D mesons RAA: Comparison
Plot with missing D*+ and Ds bins for a visual comparison
Very good agreement among D0, D*+ and D+. Ds agrees writhing uncertainties
Derived preliminary
w D*+ RAA in 1-2 GeV/cw Ds RAA in 2-4 GeV/c
17/1/2017 Grelli Alessandro 20
)c (GeV/Tp
0 2 4 6 8 10 12 14 16
0/D
*+ D
0
0.2
0.4
0.60.8
1
1.2
1.4
1.61.8
2ALICE |<0.5y|
= 5.02 TeVNNs30-50% Pb-Pb, = 7 TeVspp,
= 5.02 TeVNNs30-50% Pb-Pb, = 7 TeVspp,
2.0% BR uncertainty not shown
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Non-strange D meson ratios
Preliminary requests
to be re-done without Pb-Pb D* in 1-2 GeV/c
17/1/2017 Grelli Alessandro 21
)c (GeV/Tp
0 2 4 6 8 10 12 14 16
0/D+ D
0
0.2
0.4
0.6
0.8
1
1.2
1.4 ALICE |<0.5y| = 5.02 TeVNNs30-50% Pb-Pb,
= 7 TeVspp, = 5.02 TeVNNs30-50% Pb-Pb,
= 7 TeVspp,
2.7% BR uncertainty not shown
)c (GeV/Tp
0 2 4 6 8 10 12 14 16
+/D+ sD
0
0.5
1
1.5
2
2.5
3
3.5ALICE |<0.5y|
= 5.02 TeVNNs30-50% Pb-Pb, = 7 TeVspp,
= 5.02 TeVNNs30-50% Pb-Pb, = 7 TeVspp,
4.3% BR uncertainty not shown
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Preliminary requests
Ds ratios
to be re-done without Pb-Pb Ds in 2-4 GeV/c
17/1/2017 Grelli Alessandro 22
)c (GeV/Tp
0 2 4 6 8 10 12 14 16
0/D+ sD
0
0.2
0.4
0.6
0.8
1
1.2
1.4 ALICE |<0.5y| = 5.02 TeVNNs30-50% Pb-Pb,
= 7 TeVspp, = 5.02 TeVNNs30-50% Pb-Pb,
= 7 TeVspp,
3.7% BR uncertainty not shown
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Technical preliminaries
RAA analyses:3 mass plots in 3 different canvases: D0 (1-2), D+ (5-6) and D*+ (24-36)
2 mass plots for Ds (low and high pt)
4 efficiencies in 4 different canvases: D0, D+, D*+ and Ds
for a total of 9 technical preliminary
In order to help in building the QM talks and posters we would like to ask for the following technical preliminaries:
D+ as example
17/1/2017 Grelli Alessandro 23
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Conclusions
Signal extracted in the range 1-36 GeV/c for D0, 2(1)-36 GeV/c for D*+ and D+ and 2-16 GeV/c for Ds
good agreement data-MC for width and position in the whole pT range
Systematic evaluated. Improvment up to factor 2 for all the D mesons.Small refiment needed for D*+ tracking systematic. Ready in 2-3 days, the difference, if any, will not modify the physics message (most probably invisible by eye)
dN/dpT and RAA evaluated for all the 4 D meson species. Results are (very close to) final. Minor
D meson ratios evaluated
NOTE: in addition we aim to prepare the “average” D mesons RAA (D0, D+ and D*+). It imply just running one macro since the procedure is exactly the same as for the run I papers
17/1/2017 Grelli Alessandro 24
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Backup
Mean position vs pT - comparison data-MC
)c (GeV/T
p5 10 15 20 25 30 35
Mas
s
1.85
1.855
1.86
1.865
1.87
1.875MC
data
(GeV/c)Tp
5 10 15 20 25 30 35
)2m
ean
(GeV
/c
1.866
1.868
1.87
1.872
1.874
1.876
1.878
1.88DataMCPDG value
What about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
)2Sigma (GeV/c2 4 6 8 10 12 14 16
)2Si
gma
(GeV
/C
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
Peak width
FreeMC+15%MC
Peak width
)2Mass (GeV/c2 4 6 8 10 12 14 16
)2M
ean
(GeV
/C
1.962
1.964
1.966
1.968
1.97
1.972
1.974
1.976
Peak position
DataMCPDG
Peak position
D0
D+
Ds
Pt (GeV/c)5 10 15 20 25 30 35
)2
Mass
(G
eV
/c
0.143
0.1435
0.144
0.1445
0.145
0.1455
0.146
0.1465
0.147
0.1475
0.148
Data
MC
D*+
Yield extractionWhat about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
For Ds: signal shape (mean and σ free/fixed to MC values), fit ranges, bin widths
Ds: 8-12 GeV/c
https://indico.cern.ch/event/597358/contributions/2417713/attachments/1393183/2122972/PF_170110.pdf
For more details see the PF presentation:
Mean position vs pt - comparison data-MCWhat about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Mean position vs pt - comparison data-MCWhat about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8
Mean position vs pt - comparison data-MCWhat about RHIC results
Disagreement STAR-PHENIX factor 2 in cross section measurement.
Data in agreement with binary scaling - negligible initial state nuclear effects.
Charm with non photonic electrons.
High suppression of charm, at the level of light quark. Predictions
contradicted!.
EPS2009 - Krakow Alessandro Grelli 8 03/12/09 - Pavia Alessandro Grelli 8