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SUMMARY:Conventional effects in higher cumulant ratios of conserved charge
s in relativistic heavy ion collisions
DTSTART;VALUE=DATE-TIME:20120816T200000Z
DTEND;VALUE=DATE-TIME:20120816T220000Z
DTSTAMP;VALUE=DATE-TIME:20200402T104321Z
UID:indico-contribution-308733@indico.cern.ch
DESCRIPTION:Speakers: Yuanfang Wu (Institute of Particle Physics\, CCNU\,
wuhan China)\nHigher cumulant ratios of conserved charges are suggested to
be sensitive probe of QCD critical end point [1] in relativistic heavy io
n collisions. Their behaviors at current relativistic heavy ion collisions
are highly interested and studied intensively [2\,3]. Before we draw the
critical-like fluctuations from the measured higher cumulants\, it is nece
ssary to know what the contributions of conventional effects are. \n I
n the present work\, we firstly derive the Poisson-like statistical fluctu
ations of net-proton number [4]\, and net-electric charge. It shows that n
et-proton kurtosis at top incident energy of RHIC [3] is dominated by Pois
son-liked statistical fluctuations [4]. So dynamical higher moments\, subt
racting the statistical parts\, are suggested. \n Secondly\, the influ
ences of the centrality\, the efficiency of the detector\, and the cuts of
transverse momentum (pT) and rapidity in higher cumulant ratios of net-pr
oton are systematically studied by using the sample of Au + Au collisions
at 39GeV generated by APMT default model. It is found: (1) Both dynamical
and directly measured cumulant ratios are sensitive to the definitions of
centrality. (2) Dynamical cumulant ratios are little efficiency dependent.
(3) Both dynamical and directly measured cumulant ratios are the cuts of
phase-space dependent. \n\nReferences:\n[1] Volker Koch\, arXiv:0810.2520.
\nM.A. Stephanov\, Phys. Rev. Lett. 102\, 032301 (2009)\;\nMasayuki Asakaw
a et al.\, PRL 103\, 262301 (2009)\;\n M.A. Stephanov\,Phys. Rev. Lett 1
07\, 052301(2011)\;\n[2] A.M. Halasz\, A.D. Jackson\, R.E. Shrock\, M.A. S
tephanov and J.J.M. Verbaarschot\, \n Phys. Rev. D 58\, 096007(1998)\; S
.Gupta et al.\, Science 332\, 6037(2011).\n[3] M.M.Aggarwal et al.\, (STAR
Coll.)\, Phys.Rev.Lett. 105\, 022302(2010). Talks at the Workshop \n On
Fluctuations\, Correlations and RHIC Low Energy Runs\, http://www.bnl.gov
/fcrworkshop/\, \n and the 7th International Workshop onâ€¨Critical Poin
t and Onset of Deconfinement\, \n http://conf.ccnu.edu.cn/~cpod2011/.\n[
4] Lizhu Chen et al.\, J.Phys.G:Nucl.Part.Phys. 38\, 115004(2011).\n\nhttp
s://indico.cern.ch/event/181055/contributions/308733/
LOCATION: Regency 1/3 and Ambassador
URL:https://indico.cern.ch/event/181055/contributions/308733/
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