fK K analysis in run4 AuAu collisions at sNN 200 GeV

1
f?KK- analysis in run4 Au-Au collisions at ?sNN
200 GeV

• Dipali Pal
• Vanderbilt University
• Analysis Fest
• Light/ Heavy PWG
• May 12, 2005

2
Introduction Analysis goals

• f ? KK- line shape analysis Large number of
  centrality bins.
• f meson yield analysis (mT spectra, dN/dy and T)
  over at least 10 centrality bins and larger
  number of mT bins than Run2.
• Centrality dependence of the f yield.
• Needed to study transition of f meson
  yield in
• p-p ? d-Au ? Au-Au systems.
• Rcp, RAA of f mesons
• 5. f/p and f/K ratios over 10 centrality bins
  and different pT bins.
• 6. Elliptic flow analysis of the f mesons.

3
f? KK- invariant mass spectrum
Uncalibrated momenta
ltmgt 1.02006 /- 0.00010 GeV G 5.30 /- 0.31
MeV
ltmgt 1.01997 /- 0.00009 GeV G 4.75 /-
0.24 MeV
Applied 2 Momentum scale recalibration
ltmgt 1.01880 /- 0.000135 GeV G 4.82 /- 0.40
MeV
ltmgt 1.01892 /- 0.00010 GeV G 4.37 /- 0.28
MeV
Momentum corrections improved the f width by 0.4
MeV Improvement in width expected with a more
accurate momentum value
4
Line shape analysis
mf 1.019456 GeV
G 4.24 MeV
5
mT spectrum from TOF-TOF analysis
Minimum-bias

• -- Embedding and run-by-run corrections were
  taken from Run2
• -- PPG016 TOF-TOF dN/dy 1.16 /- 0.17 (stat)
  /- 0.19 (syst)
• T (MeV) 380
  /- 18 /- 22
• Need to apply run4 embedding corrections
• data MC tuning
  corrections (fiducial cuts)
• run-by-run
  corrections

6
v2 of f
We shall compute v2 of f mesons by measuring
azimuthal asymmetries with respect to the
reaction plane.
For example Run2 Au-Au collisions _at_ ?sNN 200
GeV

• Run2 analysis showed large
• statistical errors.
• Expect to get 30 times more f
• than Run2.
• Reduction of statistical error
• by a factor of 5 6.

Note The CabanaBoy system still has problems
with handling the needed number of event
classes (Z vertex, Centrality, Reaction Plane).
The extraction of v2 depends upon having the
adding reaction plane dimension.
7
Tasks done

• Code is ready to go for analysis train
• Simulation (Event ? PISA ? (n)DST) is completed.
• Initial data scan for f meson reconstruction is
  completed (shown to PWG).
• Hadron PID calibration with EMCAL is finished.

Tasks to be done

• Run-by-run QA
• Embedding
• Simulation studies to calculate f mass
  resolution.
• Data MC tuning ? Fiducial studies for data and
  MC.
• Systematic errors.
• v2 analysis (following the techniques discussed
  during Run2 analysis).

8
Other issues

• Need help with getting a good run list on the
  basis of subsystem QA.
• The first version of the analysis note is
  anticipated in early June.
• Will request for preliminary after that.

9
Backup slide-1
(before applying 2 momentum scale)
(after applying 2 momentum scale)
10
f meson line shape before 2 momentum scale
recalibration
Backup slide 2
11
Data and MC fiducial checks
Data
MC
field
MC
Data
- - field