Naslov
K*(892)0 and K̅ *(892)0 production in central Pb + Pb, Si + Si, C + C, and inelastic p + p collisions at 158A GeV

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

Izvornik
Physical Review C - Nuclear Physics (0556-2813) 84 (2011); 064909-1

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

Ključne riječi
NA49; CERN; SPS; K(892); production

Sažetak
Production of the K*(892)0 and K̅*(892)0 resonances was studied via their K+π− and K−π+ decay modes in central Pb+Pb, Si+Si, C+C, and inelastic p+p collisions at 158A GeV(√sNN=17.3 GeV) with the NA49 detector at the CERN SPS. Transverse momentum and rapidity distributions were measured and total yields were estimated. The yield of K* exceeds that of K̅* by about a factor of two in nucleus-nucleus reactions. The total yield ratios 〈K*〉/〈K+〉 and 〈K̅*〉/〈K−〉 are strongly suppressed in central Pb+Pb compared to p+p, C+C, and Si+Si collisions, in agreement with the expected attenuation of these short-lived resonance states in the hadronic phase of the expanding fireball. The UrQMD model, although incorporating such a scenario, does not provide a quantitative description of the experimental results. The statistical hadron gas model assuming the same freeze-out parameters for stable hadrons and resonances overestimates the 〈K*〉/〈K〉 ratios in central Pb+Pb collisions by about a factor of 2.5.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
NA49 Collaboration

POVEZANOST RADA