Aug 12 – 18, 2012
US/Eastern timezone

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Baryon anomaly in heavy-ion collisions and colour correlations in QGP

Aug 15, 2012, 11:40 AM
Regency 2/3

Regency 2/3


Karel Safarik (CERN)


A baryon anomaly – an increase baryon-to-meson production ratio at intermediate transverse momenta in heavy-ion collisions when compared to proton–proton collisions – is observed at RHIC and the LHC. This effect is usually explained by recombination of constituent quarks during QGP hadronisation, or as a consequence of a strong radial flow developed during the heavy-ion collision. In this contribution, a different 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 dependencies of the baryon-to-meson ratio and of the size of the recombination domain on the colour-correlation configuration will be presented.

Primary authors

Prof. Eugene Levin (Tel Aviv University and Universidad Tecnica Federico Santa Maria Valparaiso) Karel Safarik (CERN) Mikhail Ryskin (Petersburg Nuclear Physics Institute)

Presentation materials

Peer reviewing


Paper files: