nDST QA for singlemuon analysisnDST QA for singlemuon analysis
WooJin J. ParkWooJin J. Park
Korea UniversityKorea University
Santa Fe Workshop, Jun. 22th 2004
Santa Fe Meeting, Jun. 22th 20042
Contents
Muon Event Vertex Analysis– Vertex dependence – Variation within a run– Run by Run variation
Last Gap Muon Analysis– Last Gap Muon and Open charm– Last gap muon and total momentum– Comparison of Run3 and Run4 data– Comparison of North and South arm
Santa Fe Meeting, Jun. 22th 20043
Z vertex Dependence
z [cm]
Normalized Muon Biased Z vertex
Beam
Absorber
Filter out decay muon by Z-vertex analysis
Muon yield increasing linearly as function of distance from the absorber, indicates /K decay muon is detected.
Linear shape of z vertex slope is because c~100 [m].
/K decay dominates single muons.
Prompt or punch through background has no vertex dependent.
Fe Cu
Beam
MuTr
BBC
Need to find Good Reference Vertex distribution!!
Santa Fe Meeting, Jun. 22th 20044
Reference Vertex Distribution – Run3 dAu
From Ming’s analysis note
Santa Fe Meeting, Jun. 22th 20045
Vertex Distribution – Run3 dAu
1. Use pro.48 Minbias nDST2. Total 504 runs3. Merge all segments for each run4. cut : abs(BBC_Z_vertex)<265. Fit with single gaussian function
Santa Fe Meeting, Jun. 22th 20046
Example Plot – Run3 dAu
Run # : 78633
Santa Fe Meeting, Jun. 22th 20047
Variation within a run – Run3 dAu
Quite Stable!!!
Santa Fe Meeting, Jun. 22th 20048
Variation over all runs – Run3 dAu
Santa Fe Meeting, Jun. 22th 20049
Vertex Distribution – Run4 AuAu
1. Use private repass Minimum Bias nDST samples
2. Total 162 runs3. Use first segment for each run4. The number of events per run is 70005. Fit with single gaussian function
Santa Fe Meeting, Jun. 22th 200410
Example Plot – Run4 AuAu
Santa Fe Meeting, Jun. 22th 200411
Variation within a run – Run4 AuAu
Santa Fe Meeting, Jun. 22th 200412
Run by Run Variation – Run4 AuAu
Santa Fe Meeting, Jun. 22th 200413
Last Gap Muon for Open Charm
?
Last Gap Muon
Gap3 Muon
Gap4 Muon
• Muon from the open charm has large momentum as compared with other muons
• There is every probability that it can be reached to the MuID last gap
• But we cannot measure the number of last gap muons directly
Santa Fe Meeting, Jun. 22th 200414
Last Gap Muon for Run3 dAu
Santa Fe Meeting, Jun. 22th 200415
Last Gap Muon for Run4 AuAu
Santa Fe Meeting, Jun. 22th 200416
Number of Gap3, Gap4 and Last Gap Muon – Run4 AuAu
108000 110000 112000 114000 116000 118000 120000 122000
600
900
1200
1500
1800
2100
2400
2700
3000
3300
3600
3900
Nu
mb
er
of M
uo
n
Run Number
Last Gap Muon Gap4 Muon Gap3 Muon
Santa Fe Meeting, Jun. 22th 200417
Last Gap Muon vs Total Momentum
Santa Fe Meeting, Jun. 22th 200418
Santa Fe Meeting, Jun. 22th 200419
To Do List from now on
Vertex Analysis– Need more study on Run4 AuAu data– Reference vtx distribution : run by run? seg by seg?– Make reference vtx distribution after production– Goodrun list based on vertex analysis
Last Gap Muon Analysis– Need to find good quality cut– Need to understand the correlation between gap3, gap
4, and last gap muon
Santa Fe Meeting, Jun. 22th 200420
Summary
Vertex Analysis– We can separate decay muon and prompt muon by verte
x analysis small variation within a run large variation over the run large variation within a run small variation over the run
Last Gap Muon Analysis– We can separate open charm decay muons and hadron
decay muons by last gap muon analysis– Need more study on Run4 data
- Run 3 run by run reference
- Run 4 need more study!!
Santa Fe Meeting, Jun. 22th 200421
BACKUP SLIDESBACKUP SLIDES
Santa Fe Meeting, Jun. 22th 200422
Estimation of the Number of Last Gap Muon
iL
eNiN
0)(
Where, is the number of gap i pion
is the number of pion at vertex
is the total thicknesses of the absorber
is the slope
)(iN
0N
iL
Santa Fe Meeting, Jun. 22th 200423
Estimation of the Number of Last Gap Muon
3
0)3(L
eNN
4
0)4(L
eNN
We can get and0N
5
0)5(L
eNN
Santa Fe Meeting, Jun. 22th 200424
Run3 dAu
Run4 AuAu
Santa Fe Meeting, Jun. 22th 200425
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