Centrality dependence of charged-neutral particle fluctuations in 158A (GeVPb)-Pb-208+Pb-208 collisions

0185782 - UJF-V 20033102 RIV US eng J - Článek v odborném periodiku
Aggarwal, M. M. - Ahammed, Z. - Angelis, A. L. S. - Antonenko, V. - Hřivnáčová, Ivana - Kugler, Andrej - Šumbera, Michal
Centrality dependence of charged-neutral particle fluctuations in 158A (GeVPb)-Pb-208+Pb-208 collisions.
Physical Review. C. Roč. 67, č. 4 (2003), s. -044901. ISSN 0556-2813
Grant CEP: GA ČR GA202/95/0217
Výzkumný záměr: CEZ:AV0Z1048901
Klíčová slova: heavy ion collisions * disoriented chiral condensate
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 2.708, rok: 2003

Results on the study of localized fluctuations in the multiplicity of charged particles and photons produced in 158A GeV/c Pb+Pb collisions are presented for varying centralities. The charged versus neutral particle multiplicity correlations in common phase space regions of varying azimuthal sizes are analyzed by two different methods. Various types of mixed events are constructed to probe fluctuations arising from different sources. The measured results are compared to those from simulations and from mixed events. The comparison indicates the presence of nonstatistical fluctuations in both the charged particle and photon multiplicities in limited azimuthal regions. However, no correlated charged-neutral fluctuations, a possible signature of formation of disoriented chiral condensates, are observed. An upper limit on the production of disoriented chiral condensates is set.
Trvalý link: http://hdl.handle.net/11104/0082157