Baryon Anomaly in Heavy-Ion Collisions and Colour Correlations in QGP

Autor: K. Šafařík, E. Levin, M. G. Ryskin, Gustaw Matulewicz
Rok vydání: 2013
Předmět:
Zdroj: NUCLEAR PHYSICS A
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
ISSN: 0375-9474
DOI: 10.1016/j.nuclphysa.2013.02.040
Popis: A baryon anomaly – an increased baryon-to-meson production ratio at intermediate p T in heavyion collisions when compared to pp collisions – is observed at RHIC and the LHC. This effect is usually explained by recombination of constituent quarks during QGP hadronization, or as a consequence of a strong radial flow developed during the heavy-ion collision. In this contribution, an additional mechanism to favour baryon over meson production is proposed: when hadrons are formed in the recombination of nearby quarks and antiquarks, only colour-singlet combinations can be chosen. Hadron formation, in particular the probability to create baryons or mesons, depends on the distribution of colour charges among quarks. If the distribution is random – a reasonable assumption for Quark–Gluon Plasma (QGP) – the baryon-to-meson ratio is nearly twice higher than in the situation where quark colours are pre-arranged to obtain a white hadron in the combination of nearest quarks and antiquarks. The correlation of colour charges in the QGP also influences the distance over which recombination occurs. A study of the dependence of the baryon-to-meson ratio on the size of the colour correlation domain is presented.
Databáze: OpenAIRE
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