Probability distribution of conserved charges and the QCD phase transition QCD phase boundary, its O(4) „scaling” & relation to freezeout in HIC Moments.

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Presentation transcript:

Probability distribution of conserved charges and the QCD phase transition QCD phase boundary, its O(4) „scaling” & relation to freezeout in HIC Moments and probablility distributions of conserved charges as probes for proximity to O(4) criticality STAR data & expectiations With: P. Braun-Munzinger, B. Friman F. Karsch, V. Skokov

Relating freezeout and QCD critical line at small chemical potential Particle yields and their ratios as well as LGT thermodynamics at are well described by the HRG Partition Function ! QCD crossover line- remnant of the O(4) criticality A. Andronic et al., Nucl.Phys.A837:65-86,2010. O(4) universality Chemical freezeout and QCD crtitical line

3 LGT and phenomenological HRG model C. Allton et al., The HRG partition function provides and excellent approximation of the QCD thermodynamics at S. Ejiri, F. Karsch & K.R. See also: C. Ratti et al., P. Huovinen et al., B. Muller et al.,…….

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

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

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

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 ! Ratio of cumulants at finite density HRG

C. Schmidt, HotQCD F. Karsch & K.R. Phys. Rev. D Rap. Com, (2011)

Deviations of the ratios from their asymptotic, low T-value, are increasing with the order of the cumulant order and with increasing chemical potential Properties essential in HIC to discriminate the phase change by measuring baryon number fluctuations ! Ratio of higher order cumulants at finite density

Properties of fluctuations in HRG Calculate generalized susceptibilities: from Hadron Resonance Gas (HRG) partition function: and resulting in: Compare these HRG model predictions with STAR data at RHIC: and

Coparison 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

Mean, variance, skewness and kurtosis obtained by STAR and rescaled HRG STAR Au-Au these data, due to restricted phase space: Account effectively for the above in the HRG model by rescaling the volume parameter by the factor 1.8/8.5

Moments obtained from probability distributions Moments obtained form the probability distribution Probability quantified by all moments In statistical physics Moments generating function:

Probability quantified by :mean numbers of charged 1,2 and 3 particles & their antiparticles conservation on the average exact conservation

The probability distribution for net baryon number N is governed in HRG by the Skellam distribution The probability distribution for net proton number N is entirely given in terms of (measurable) mean number of protons b and anti-protons P(N) in the Hadron Resonance Gas for net- proton number

Probability distribution obtained form measured particle spectra: STAR data Mean proton and anti-proton calculated in the HRG with taken at freezeut curve and Volume obtained form the net-mean proton number broken lines

Comparing HRG Model with Preliminary STAR data: efficiency uncorrected Data consistent with Skellam distribution: No sign for criticality Data presented at QM’11, H.G. Ritter, GSI Colloquium

Centrality dependence at 39 and 200 GeV Preliminary STAR data STAR data Phys. Rev. Lett. 105 (2010) Data consitent with Skellam distribution: No sign for criticality Xiaofeng Luo for the STAR Collaboration arXiv: Data efficiency uncorrected !

Centrality dependence at 39 and 200 GeV Preliminary STAR data STAR data Data consitent with Skellam distribution HRG shows broader distribution

Centrality dependence at 39 and 200 GeV Preliminary STAR data STAR data-efficiency uncorected Data consitent with Skellam distribution HRG shows broader distribution

See also: Claudia Ratti for LGT Data of Budapest-Wuppertal Coll.

Data versus UrQMD UrQMD provide much too narower probability distribution of net proton number V. Skokov et al..

Probability distributions and their energy dependence for The maxima of have very similar values for all thus const. for all

Moments energy dependence: Skellam distribution Weak dependence of even order cummulants on energy!!

Conclusions: Higher order moments and probability distributions are excellent probes of criticality in HIC The 6th and 8th order moments negative already at the LHC Deviation of P(N) sets in at and increases with centrality: remnant of O(4) criticality This might indicate that critical line decouples from the freezeout line near The above need to be checked with efficiency corrected data ? J. Cleymans &K.R.