Naslov
System-size dependence of particle-ratio fluctuations in Pb+Pb collisions at 158A GeV

Autori
Antičić, Tome ; ... ; Kadija, Krešo ; ... ; Šuša, Tatjana ; ... ; Wojtaszek-Szwarc A.

Izvornik
Physical Review C - Nuclear Physics (0556-2813) 87 (2013), 2; 024902-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
NA49; SPS; system-size particle; -ratio; fluctuation; critical endpoint
(NA49; SPS; system-size; particle-ratio; fluctuation; critical endpoint)

Sažetak
New measurements by the NA49 experiment of the centrality dependence of event-by-event fluctuations of the particle yield ratios (K+ + K−)/(π+ + π−), (p + bar-p)/(π+ + π−), and (K+ + K−)/(p + bar-p) are presented for Pb+Pb collisions at 158A GeV. The absolute values of the dynamical fluctuations of these ratios, quantified by the measure σdyn, increase by about a factor of two from central to semiperipheral collisions. Multiplicity scaling scenarios are tested and found to apply for both the centrality and the previously published energy dependence of the (K+ + K−)/(π + + π−) and (p + bar-p)/(π+ + π−) ratio fluctuations. A description of the centrality and energy dependence of (K+ + K−)/(p + bar-p) ratio fluctuations by a common scaling prescription is not possible since there is a sign change in the energy dependence.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA