Simulation of the K/? Ratio Fluctuations

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Simulation of the K/? Ratio Fluctuations

• D. Kresan
• CBM Software Week
• May 10-15, 2004
• GSI, Darmstadt

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Outline

• What is the acceptance of the CBM detector for
  ?, K, p, D0, J/Psi as a function of beam energy
  ?
• Is hadron ID by TOF sensitive for measurement of
  event-by-event particle ratio fluctuations ?

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Simulation input
STS - standard setup TOF 10 meters Field ? 1T
D0 ?y1.0, T300MeV
J/Psi ?y1.0, T170MeV
?, K, p central AuAu collision by UrQMD
4
?
K
p
pt GeV/c
y
5
D0
J/Psi
Almost constant acceptance from 10 to 45 AGeV
pt GeV/c
y
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K/? ratio in each event
Simulated 10 fluctuations of true data
accepted
identified (60ps, 70)
true
10k UrQMD events
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Measured dynamical fluctuations
True value 5 10
pu-rity, ?dyn, ?dyn,
40 4.01.4 6.9 2.4
50 4.3 1.7 9.8 3.9
60 5.5 2.5 8.5 4.0
70 6.0 3.0 10.4 5.2
80 - -
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To do

• More events ( gt 40k) are needed
• Study the sensitivity of HID to the fluctuations
  of K/? ratio
• Take the non-fluctuated ratios from the mixed
  events data, instead of UrQMD