Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Fundamental Symmetries
HK 26.7: Talk
Tuesday, March 15, 2016, 18:15–18:30, S1/01 A02
Extraction of moments of net-particle event-by-event fluctuations in the CBM experiment — •Volodymyr Vovchenko1,2,3 and Ivan Kisel1,2 for the CBM collaboration — 1Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany — 2Goethe University, Frankfurt am Main, Germany — 3Taras Shevchenko University, Kyiv, Ukraine
The future CBM experiment at FAIR will employ high intensity beams and large acceptance detectors in order to study the properties of the strongly interacting matter produced in heavy-ion collisions at high baryon densities. The search for the conjectured critical point of QCD is one the important tasks. It is predicted from statistical physics that higher moments of event-by-event fluctuations are very sensitive to the proximity of the critical point. This argument is explicitly demonstrated with the van der Waals equation of state. Thus, it was suggested that higher moments of fluctuations of conserved charges can be used as probes for the critical behavior.
The statistical convergence of cumulants of different order is explored. The extraction of scaled variance, skewness, and kurtosis of proton distribution from simulated UrQMD events is performed and the efficiency correction described by binomial distribution is accounted for. The validity of this correction is tested with different modelings of the CBM detector response: from binomial distribution with fluctuating event-by-event efficiency to a full-scale GEANT simulation. The obtained results indicate that a more elaborate efficiency correction is needed in order to accurately reconstruct moments of higher orders.