Speaker
Frithjof Karsch
(Brookhaven National Laboraoty)
Description
Fluctuations of conserved charges, i.e. baryon number, strangeness
and electric charge, are sensitive probes for the transition from
the confined hadronic to the deconfined partonic phase of strong
interaction matter. Rapid changes of, e.g. quadratic fluctuations
of net baryon number, net strangeness as well as correlations
between these conserved charges, signal the change of degrees of
freedom that carry the corresponding quantum numbers. The
magnitude of these charge correlations and fluctuations provides
information not only on the mass of the carriers of these quantum
numbers (hadrons or quarks), they also are sensitive to the
overall number of these degrees of freedom.
We show that the analysis of correlations between net baryon number
and net strangeness or net charm, respectively, provides evidence
for the presence of many, experimentally yet unobserved, strange
and charmed baryons in hadronic matter at temperatures close to the
transition to the quark-gluon plasma [1,2]. We furthermore show that the
inclusion of these resonances in the modeling of the hadronic phase
of strong interaction matter leads to modifications in the prediction
of freeze-out conditions in heavy ion collisions.
[1] A. Bazavov et al., The melting and abundance of open charm hadrons,
arXiv:1404.4043 [hep-lat].
[2] A. Bazavov et al., More strange hadrons from QCD thermodynamics and
strangeness freeze-out in heavy ion collisions, arXiv:1404.6511 [hep-lat].
Primary author
Frithjof Karsch
(Brookhaven National Laboraoty)
