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SUMMARY:Recent results on cumulant ratios at nonzero temperature and densi
ty from lattice QCD
DTSTART;VALUE=DATE-TIME:20180515T171000Z
DTEND;VALUE=DATE-TIME:20180515T174000Z
DTSTAMP;VALUE=DATE-TIME:20200805T083729Z
UID:indico-contribution-2871185@indico.cern.ch
DESCRIPTION:Speakers: Christian Schmidt (University of Bielefeld)\nWe pres
ent recent results on the distributions of conserved charge fluctuations.
In particular\, we discuss ratios of the shape parameters mean\, variance\
, skewness and kurtosis of the net baryon- number\, electric charge and st
rangeness distributions. For the net baryon-number fluctuations we find
– using a next-to-leading order Taylor expansion – that qualitative fe
atures of these ratios closely resemble the corresponding experimentally m
easured cumulants ratios of net proton-number fluctuations for beam energi
es down to collision energies of 19.6 GeV. We show that the observed diffe
rence in cumulant ratios for the mean net baryon-number and the normalized
skewness arises naturally in QCD thermodynamics. Moreover\, we establish
a close relation between skewness and kurtosis ratios\, at small values of
the baryon chemical potential. In the case of electric charge and strange
ness fluctuations we show that these ratios are sensitive to the presence
of multiple charged particles.\nThe calculations are based on lattice QCD
simulations with physical quark masses and a highly improved staggered qua
rk (HISQ) action. The lattice size is $N_\\sigma^3\\times N_\\tau$\, with
an aspect ratio $N_\\sigma/N_\\tau=4$ and three different lattice spacings
\, corresponding to the number of temporal sites $N_\\tau=8\, 12$ and $16$
. Continuum extrapolations have been performed for most of our observables
.\n\n 1. A. Bazavov *et al.* [HotQCD Collaboration]\, “Skewness and kurt
osis of net baryon-number distributions at small values of the baryon chem
ical potential\,” Phys. Rev. D 96 (2017)\, 074510 [arXiv:1708.04897].\n
2. A. Bazavov *et al.*\, “The QCD Equation of State to $\\mathcal{O}(\\m
u_B^6)$ from Lattice QCD\,” Phys. Rev. D 95 (2017)\, 054504 [arXiv:1701.
04325].\n\nhttps://indico.cern.ch/event/656452/contributions/2871185/
LOCATION:Palazzo del Casinò First floor and third floor
URL:https://indico.cern.ch/event/656452/contributions/2871185/
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