Sensitivity of Phenix to Multiplicity Fluctuation

John P. Sullivan

Los Alamos National Laboratory

• dN/deta for many events (top) and a single event (bottom)--from the CDR
• dn/deta for 10 individual sample events from a PISA calculation
• dN/deta for 10 individual sample events -- true value before instrumental effects
• How the plots which follow were constructed
• dN/deta values in deta=0.25 bins for -2.5 < eta < 2.5 -- PISA calculation
• dN/deta values in deta=0.25 bins for -2.5 < eta < 2.5 -- true values
• dN/deta values in deta=0.25 bins for 8 eta values -- PISA calculation
• dN/deta values in deta=0.25 bins for 8 eta values -- true values
• "sigma/mean" plots of dN/eta fluctuation vs. eta -- PISA vs. true
• "sigma/mean" vs. width of eta bins for -2.5 < eta < 2.5 -- PISA and true values
• Scaled factorial moments calculated from PISA events
• Negative binomial analysis (suggested by M. Tannenbaum) for PISA events
• Conclusions