Aug 12 – 18, 2012
US/Eastern timezone

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Higher moments of net-charge multiplicity distributions at RHIC energies from STAR

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Exploring the QCD phase diagram Poster Session Reception


NIHAR R SAHOO (Variable Energy Cyclotron Centre)


To prob e the critical p oint (CP) of QCD phase transition, the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory has undertaken the beam energy scan program, colliding high energy heavy-ions corresponding to baryonic chemical potentials within the range of 20 - 550 MeV. QCD based model calculations reveal that the correlation length of the system diverges at the CP. The higher order moments (such as standard deviation ($\sigma$), skewness (S) and kurtosis ($\kappa$)) of the net-charge, net-baryon and net-strangeness multiplicity distributions are related to the corresponding higher order susceptibilities and also to the correlation length of the system. The non-monotonic behavior of these higher moments as a function of colliding energy could be considered as a signal of the CP. The STAR experiment has taken data for Au+Au collisions at 200 GeV, 62.4 GeV, 39 GeV, 27 GeV, 19.6 GeV, 11.5 GeV and 7.7 GeV center of mass energies. Here we report the mid-rapidity measurement of the higher order moments of the net-charge multiplicity distribution using the STAR time projection chamber detector for above beam energies. The energy and centrality dependence of higher moments and their products (such as $\frac{\sigma^{2}}{M}, S$\sigma$ and $\kappa\sigma^{2}$) will be presented. The data will also be compared to Poisson expectations and Hadron Resonance Gas model calculations

Primary author

NIHAR R SAHOO (Variable Energy Cyclotron Centre)

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