Dergi makalesi Açık Erişim
CERN İşbirliği
The multi-strange baryon yields in Pb Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, pT , in p Pb collisions at a centre-of-mass energy of sNN=5.02 TeV . The results cover the kinematic ranges 0.6 GeV/c<pT<7.2 GeV/c and 0.8 GeV/c<pT<5 GeV/c , for Ξ and Ω respectively, in the common rapidity interval −0.5<yCMS<0 . Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pT spectra are analysed as a function of event charged-particle multiplicity, which in p Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pb Pb collisions. The measured pT distributions are compared to the expectations from a Blast-Wave model. The parameters which describe the production of lighter hadron species also describe the hyperon spectra in high multiplicity p Pb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pb Pb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in p Pb data, the values of which range from those measured in minimum bias pp to the ones in Pb Pb collisions. A statistical model qualitatively describes this multiplicity dependence using a canonical suppression mechanism, in which the small volume causes a relative reduction of hadron production dependent on the strangeness content of the hyperon.
Dosya adı | Boyutu | |
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j.physletb.2016.05.027.pdf
md5:71738a88fef07c5bc6ff713c11c958f3 |
1.1 MB | İndir |
Görüntülenme | 19 |
İndirme | 12 |
Veri hacmi | 13.3 MB |
Tekil görüntülenme | 18 |
Tekil indirme | 12 |