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FIZIKA B 19 (2010) 2, 113-124
 
DEPENDENCE OF THE CORRELATION COEFFICIENT ON THE SIZE OF THE PHASE-SPACE
INTERVAL IN HIGH-ENERGY INTERACTIONS
DIPAK GHOSHa, ARGHA DEBa, SWARNAPRATIM BHATTACHARYYAb,
and UTPAL DATTAa
aNuclear and Particle Physics Research Centre, Department of Physics,
Jadavpur University, Kolkata - 700 032, India
bDepartment of Physics, New Alipore College, L Block, New Alipore,
Kolkata 700053, India
Received 4 February 2010; Revised manuscript received 19
April 2010
Accepted 7 July 2010 Online 8 October 2010
We calculated the cumulant moments in order to find the genuine two-particle
short-range correlations among the produced pions and also the correlation
coefficients in order to quantify the correlations. We studied the cumulant
moments and their variation with the pseudorapidity phase-space interval for
nucleus-nucleus interactions (24Mg-AgBr at 4.5A GeV and 28Si-AgBr
at 14.5A GeV), hadron nucleus interactions (p-AgBr at 800 GeV) and hadron-hadron
collisions (p[`
(p)] at
Ös=200 GeV and
Ös=900 GeV). The analysis reveals the presence of
genuine two-particle short-range correlations among the produced pions in the
multi-particle production processes. It is found that the cumulant moments
decrease with the increase of the width of the rapidity phase-space intervals.
The decrease of cumulant moments with the increase of phase-space interval
signifies that the short-range correlation decreases. We investigated the
variation of the correlation coefficients in order to study the correlation
effects in some more detail in the above mentioned interactions. The nature of
variations of the correlation coefficients with the phase-space interval size is
different for different types of interactions.
PACS numbers: 23.20.En, 25.75-q
UDC 539.126
Keywords: correlation, NBD fit, correlation coefficient
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