Post on 17-Jan-2016
QuickTime™ and aTIFF (Uncompressed) decompressor
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HIGHLIGHTS
BRAHMS
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Outline
• BRAHMS
• Intermediate PT
• Soft physics
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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BRAHMS Collaboration
I. C. Arsene12, I. G. Bearden7, D. Beavis1, S. Bekele12, C. Besliu10, B. Budick6, H. Bøggild7, C. Chasman1, C. H. Christensen7, P. Christiansen7, H.Dahlsgaard7,
R. Debbe1, J. J. Gaardhøje7, K. Hagel8, H. Ito1, A. Jipa10, E.B.Johnson11, J. I. Jørdre9,
C. E. Jørgensen7, R. Karabowicz5, N. Katrynska5 ,E. J. Kim11, T. M. Larsen7, J. H. Lee1,
Y. K. Lee4,S. Lindahl12, G. Løvhøiden12, Z. Majka5, M. J. Murray11,J. Natowitz8, C.Nygaard7
B. S. Nielsen7, D. Ouerdane7, D.Pal12, F. Rami3, C. Ristea8, O. Ristea11, D. Röhrich9, B. H. Samset12, S. J. Sanders11, R. A. Scheetz1, P. Staszel5,
T. S. Tveter12, F. Videbæk1, R. Wada8, H. Yang9, Z. Yin9, I. S. Zgura2
1. Brookhaven National Laboratory, Upton, New York, USA2. Institute of Space Science, Bucharest - Magurele, Romania3. Institut Pluridisciplinaire Hubert Curien et Université Louis Pasteur, Strasbourg, France4. Johns Hopkins University, Baltimore, USA5. M. Smoluchkowski Institute of Physics, Jagiellonian University, Krakow, Poland6. New York University, New York, USA7. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark8. Texas A&M University, College Station, Texas, USA9. University of Bergen, Department of Physics and Technology, Bergen, Norway10. University of Bucharest, Romania11. University of Kansas, Lawrence, Kansas, USA12. University of Oslo, Department of Physics, Oslo, Norway
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Broad RAnge Hadronic Magnetic SpectrometerS
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Acceptance for charged hadrons
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Pushing to forward y
• What changes? – dN/dy– pbar/p– Chemistry
– V2 (integral)
– Initial state? (d+Au)
• What doesn’t?– Suppression
(A+A)
– V2 (pt)
– B2
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Intermediate (2-6GeV)Pt
• h+,h- from eta=0 to 3.5
• Identified particles to yp≈3.1-3.5
(depending on system)• Au+Au (200GeV, 62GeV) Cu+Cu
(200,62), p+p (200, 62)
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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200 GeV Au+Au (Run IV)
10%
40-60%
p+p
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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spectra as f(pseudo rapidity)
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Identified particle RAA, 200GeV Au+Au
y=0 y=1 y=3.1
pions
kaons
protons
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Identified particle RAA, 200GeV Au+Au
See Poster by Catalin Ristea
See Poster by Catalin Ristea
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Cu+Cu 62 GeV charged hadrons
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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p+p 62GeV
Reference for RAA
Kinematic limit
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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RAA 62 GeV midrapidity top, Cu+Cu; bottom Au+Au
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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RAA Cu+Cu,Au+Au 62 GeV,
=3.1
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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RAA Cu+Cu,Au+Au 62 GeV,
=3.1
See talk(||1.1) by Truls Larsen
See talk(||1.1) by Truls Larsen
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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RdAu vs eta
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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RdAu vs eta
See talk(||1.1) by Hongyan Yang
See talk(||1.1) by Hongyan Yang
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Other BRAHMS contributions
• J.H.Lee talk on suppression vs. xF
– Parallel session 1.1 Wednesday
• S. Bekele poster 200GeV Cu+Cu @ forward rapidity
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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V2 Identified particles 200GeV Au+Au
=0 ≈3
K
p
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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V2 Identified particles 200GeV Au+Au
See talk(||3.4) by Steve Sanders
See talk(||3.4) by Steve Sanders
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Coalescence: p+n d
• Characterize source via B2
• Assume B2≈V-1
• Details: • C. Nygaard • (||3.4 Sun.)
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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What can we say about size vs. Rapidity?
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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What can we say about size vs. Rapidity?
See talk(||3.4) by Casper N
ygaard
See talk(||3.4) by Casper N
ygaard
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Stopping: where are the baryons?
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Stopping 62 GeV Au+Au
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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K/p vs. y 62 GeV Au+Au
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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K/p vs. y 62 GeV Au+Au
See Poster by Ionut Arse
ne
See Poster by Ionut Arse
ne
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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How about vs. pbar/p?
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Stopping: systematic
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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LHC?
“net”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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LHC?
“net”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)“n
et”
pro
ton
AGS
SPS
RHIC 62
RHIC 200
LHC 5500
dN
/dy
(BRAHMS preliminary)
See Poster by Hans Dahlsgaard
See Poster by Hans Dahlsgaard
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Summary
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.• What changes? – dN/dy– pbar/p– Chemistry– V2 (integral)– Initial state? (d+Au)
• What doesn’t?– Suppression (A+A)
– V2 (pt)
– B2
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Backup Slides
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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Inverse slope vs pbar/p
36I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
14.11.06
⎟⎟⎠
⎞⎜⎜⎝
⎛−= 1
L
TOFcpm
2
2222
TIME-OF-FLIGHT
RICH: Cherenkov light focusedon spherical mirror ring on image plane
Ring radius vs momentum gives PID / K separation 20 GeV/cProton ID up to 35 GeV/c
CHERENKOV
(2 settings)
Particle Identification
14.11.06 I.G. Bearden, Niels Bohr Institute QM'06 Shanghai
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K
p
BRAHMS Acceptance: