Probing QCD Phase Diagram with Fluctuations of conserved charges Krzysztof Redlich University of Wroclaw & EMMI/GSI QCD phase boundary and its O(4) „scaling”

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Probing QCD Phase Diagram with Fluctuations of conserved charges Krzysztof Redlich University of Wroclaw & EMMI/GSI QCD phase boundary and its O(4) „scaling” Higher order moments of conserved charges as probe of QCD criticality in HIC STAR data & expectations HIC K. Fukushima

Particle yields and their ratio, as well as LGT results at are well described by the Hadron Resonance Gas Partition Function ( F. Karsch, A. Tawfik & K.R.). A. Andronic et al., Nucl.Phys.A837:65-86,2010. O(4) universality Budapest-Wuppertal LGT data Chiral crosover Temperature from LGT Chemical Freezeout LHC (ALICE) HotQCD Coll. (QM’12) P. Braun-Munzinger (QM’12) HRG model

Particle yields and their ratio, as well as LGT results are well described by the Hadron Resonance Gas Partition Function. S. Ejiri, F. Karsch & K.R. O(4) universality HRG model

O(4) scaling and critical behavior Near critical properties obtained from the singular part of the free energy density Phase transition encoded in the “equation of state” pseudo-critical line with F. Karsch et al

O(4) scaling of net-baryon number fluctuations The fluctuations are quantified by susceptibilities Resulting in singular structures in n-th order moments which appear for and for since in O(4) univ. class From free energy and scaling function one gets with

Kurtosis as an excellent probe of deconfinement HRG factorization of pressure: consequently: in HRG In QGP, Kurtosis=Ratio of cumulants with is an excellent probe of deconfinement S. Ejiri, F. Karsch & K.R.: Phys.Lett. B633 (2006) 275 Kurtosis F. Karsch, Ch. Schmidt The measures the quark content of particles carrying baryon number

Kurtosis of net quark number density in PQM model For the assymptotic value due to „ confinement” properties Smooth change with a very weak dependence on the pion mass For B. Friman, V. Skokov &K.R.

Kurtosis as an excellent probe of deconfinement HRG factorization of pressure: consequently: in HRG In QGP, Kurtosis=Ratio of cumulants excellent probe of deconfinement Ch. Schmidt at QM’12 Kurtosis F. Karsch, Ch. Schmidt The measures the quark content of particles carrying baryon number

Deviations of the ratios of odd and even order cumulants from their asymptotic, low T-value, are increasing with and the cumulant order Properties essential in HIC to discriminate the phase change by measuring baryon number fluctuations ! Ratios of cumulants at finite density: PQM +FRG HRG B. Friman, V. Skokov &K.R.

Comparison of the Hadron Resonance Gas Model with STAR data Frithjof Karsch & K.R. RHIC data follow generic properties expected within HRG model for different ratios of the first four moments of baryon number fluctuations Error Estimation for Moments Analysis: Xiaofeng Luo arXiv: v

STAR data: Deviations from HRG Critical behavior? Conservation laws? A. Bzdak, V. Koch, V.Skokov ARXIV: Volume fluctuations? B. Friman, V.Skokov &K.R.

Deviations of the ratios from their asymptotic, low T-value, are increasing with the order of the cumulant Ratio of higher order cumulants B. Friman, V. Skokov &K.R.

13 The range of negative fluctuations near chiral cross-over: PNJL model results with quantum fluctuations being included : These properties are due to O(4) scaling, thus should be also there in QCD. Range of deviations from HRG Fluctuations of the 6 th and 8 th order moments exhibit strong deviations from the HRG predictions: => Such deviations are to be expected in HIC already at LHC and RHIC energies B. Friman, V. Skokov &K.R.

Theoretical predictions and STAR data 14 Deviation from HRG if freeze-out curve close to Phase Boundary/Cross over line Lattice QCD Polyakov loop extended Quark Meson Model STAR Data STAR Preliminary L. Chen, BNL workshop, CPOD 2011 Strong deviations of data from the HRG model (regular part of QCD partition function) results: Remnant of O(4) criticality!!??

STAR DATA Presented at QM’12 Lizhu Chen for STAR Coll. V. Skokov

Moments obtained from probability distributions Moments obtained from probability distribution Probability quantified by all cumulants In statistical physics Cumulants generating function:

Probability distribution of the net baryon number For the net baryon number P(N) is described as Skellam distribution P(N) for net baryon number N entirely given by measured mean number of baryons and antibaryons In HRG the means are functions of thermal parameters at Chemical Freezeout

Shrinking of the probability distribution already expected due to deconfinement properties of QCD HRG In the first approximation the quantifies the width of P(N) LGT hotQCD Coll. Similar: Budapest-Wuppertal Col l At the critical point (CP) the width of P(N) should be larger than that expected in the HRG due to divergence of in 3d Ising model universality class Influence of criticality on the shape of P(N)

Influence of O(4) criticality on P(N) Consider Landau model: Scaling properties: Mean Field O(4) scaling

Contribution of a singular part to P(N) Got numerically from: For MF broadening of P(N) For O(4) narrower P(N) K. Morita, B. Friman, V. Skokov &K.R.

Conclusions: Hadron resonance gas provides reference for O(4) critical behavior in HIC and LGT results Probability distributions and higher order cumulants are excellent probes of O(4) criticality in HIC Observed deviations of the from the HRG as expected at the O(4) pseudo-critical line Shrinking of P(N) from the HRG follows expectations of the O(4) criticality

Influence of volume fluctuations on cumulants V Probability distribution at fixed V Moments of net charge Cumulants central moment

Volume fluctuations and higher order cumulants in PQM model in FRG approach General expression for any P(N): - Bell polynomials V. Skokov, B. Friman & K.R.