1. Run4 f K+K- analysis: analysis train
Dipali Pal
Vanderbilt University
Light/Heavy PWG
April 21, 2005

2. Status of fK+K- Analysis Module
Location of codes in CVS :
offline/AnalysisTrain/CabanaBoy/DPDSMphiCutter.h
offline/AnalysisTrain/CabanaBoy/DPDSMphiCutter.C
offline/AnalysisTrain/CabanaBoy/DPDSMphiHistos.h
offline/AnalysisTrain/CabanaBoy/DPDSMphiHistos.C
Location of macro in CVS :
offline/AnalysisTrain/CabanaBoy/macros/analyze_phikk_train.C
Valgrind output :
Valgrind summary file:
Input File Type :
CNT
Output histograms (defined in DPDSMphiHistos.C):
1D : Invariant mass,
2D : Invariant mass vs. mT,
3D : mass vs. mT vs (Y12 – phi)
Job status [ event class (cent, z, RP) = (10, 5, 1)] :
Wall time: 132 sec/file, Cpu time: 84 sec/file
Max Memory usage ~490 M

3. Goals for May 12 analysis fest
Invariant mass spectrum in TOF-TOF, TOF-EAST, EAST-EAST, WEST-WEST and Full dataset.
Line shape analysis plots (mass centroid vs centrality and width vs centrality)
mT spectra (from at least TOF-TOF combination) in different centralities (more bins than run2).
v2 analysis update (from at least TOF-TOF)
- v2 vs pT
- v2 vs centrality
- v2 vs pT at different centralities

4. Simulation status
50 M PISA events each for ++ and - - B-field configuration has been generated at Vanderbilt Computing facility ACCRE.
PISA  nDST reconstruction is in progress at ACCRE.
Project 58 at

5. What is still needed? EMCAL hadron PID -- work in progress
SUNY Phys: timing recalibration
SUNY Chem: Beam motion correction
VU: isK, isPi and isP function calibrations
Hadron QA

6. First look at fKK spectra
 ~10K f mesons from ~66 M
events
Presented in 24th Feb
PWG meeting
Using both East and
West arms.

7. Comparison of f yields with Run2 Au-Au dataset - I
Run2 TOF-TOF f yield per M min bias evt ~ 1482/20 ~ 74
Run4 TOF-TOF f yield per M min bias evt ~ 1496/66 ~ 23
 Run4 f yield / Run2 f yield ~ 31%
 TOF pair efficiency has been reduced to about 30%

8. Comparison of f yields with Run2 Au-Au dataset - II
MC results:
Analyzed ~10M pisa events for Run4 ++ field configuration and compared that with Run2.
Ratio of f mesons accepted by TOF (in PISA)
in Run4 and Run2 setup
~45% efficiency loss in Run4 compared to Run2 by central arm magnetic field configurations
Need to compare dead areas
-- Comparisons are in
progress at the DST level.