BARC/PUB/2017/0403

 
 

Conserved charge fluctuations using the D measure in heavy-ion collisions

 
     
 
Author(s)

Mishra, D. K.; Netrakanti, P. K.; Garg, P.
(NPD)

Source

Physical Review-C, 2017. Vol. 95 (5): pp. 054905.1-054905.8

ABSTRACT

We study the net-charge fluctuation D-measure variable, in high-energy heavy-ion collisions in heavy-ion jet interaction generator (HIJING), ultrarelativistic quantum molecular dynamics (UrQMD), and hadron resonance gas (HRG) models for various center-of-mass energies (√sNN). The effects of kinematic acceptance and resonance decay, in the pseudorapidity acceptance interval (η) and lower transverse momentum (pminT ) threshold, on fluctuation measures are discussed. A strong dependence of D with the η in HIJING and UrQMD models is observed as opposed to results obtained from the HRG model. The dissipation of fluctuation signal is estimated by fitting the D measure as a function of the Δη. An extrapolated function for higher Δη values at lower √sNN is different from the results obtained from models. Particle species dependence of D and the effect of the pminT selection threshold are discussed in HIJING and HRG models. The comparison of D, atmidrapidity, of net-charge fluctuations at various √sNN obtained from the models with the data from the A Large Ion Collider Experiment (ALICE) experiment is discussed. The results from the present paper as a function of Δη and √sNN will provide a baseline for comparison to experimental measurements.

 
 
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