Fluctuations and QCD Phase Structure Masakiyo Kitazawa (Osaka U.)

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Presentation transcript:

Fluctuations and QCD Phase Structure Masakiyo Kitazawa (Osaka U.)

My Messages  Fluctuations are invaluable observables in HIC  But, we must understand them in more detail  It’s possible, interesting, and important

Why Fluctuations?

Brownian Motion from Wikipedia A. Einstein 1905 Fluctuations opened atomic physics

Shot Noise X. Jehl+, Nature405,50 (2000) at Normal-Superconductor Junction super normal current Similar experiments for fractional QHE ex. Saminadayar+, PRL79,2526(1997) Normal Super Normal

Conserved-Charge Fluctuations Fluctuations of CC : rigorously defined in a theory Fluctuations of CC LAT-HIC crossover = They are lattice observables operators as the Noether current as derivatives of the partition function QCD phase diagram 3, Wed. 11:00-13:30

Electric Charge Fluctuation Asakawa,Heinz,Muller; Jeon,Koch,2000 D-measure D ~ 3-4 Hadronic D ~ QGP

Electric Charge Fluctuation PHENIX (2002); STAR (2003) ALICE, PRL 110, (2013) D measure D ~ 3-4 Hadronic D ~ QGP No suppression at RHIC energy LHC cannot be described by hadronic d.o.f. LHC energy hadronic STAR

Rapidity Window Dependence Smaller  more hadronic Larger  more QGP like Same information in balance function to be studied by fluctuating hydro. Stochastic Diffusion eq. Shuryak,Stephanov,2001 ALICE, PRL 110, (2013) hadronic

Various Contributions  Initial fluctuations  Effect of jets  Negative binomial (?)  Final state rescattering  Coordinate vs pseudo rapidities  Particle missID  Efficiency correction  Global charge conservation Enhance Enhance to Poisson Suppress

Global Charge Conservation For equilibrated medium Jeon,Koch,2000 Bleicher,Jeon,Koch,2001

Global Charge Conservation GCC effect on the hadronic diffusion is negligible in the ALICE result! Sakaida, Poster I-35 For equilibrated medium Solving the time evolution… Jeon,Koch,2000 Bleicher,Jeon,Koch,2001 GCC effect detector coverage

Electric-Charge Fluctuations  Electric charge fluctuations is suppressed at LHC!  The suppression is most probably attributed to primordial physics  Qualitative difference b/w RHIC and LHC … but why?

Non Gaussianity

Non-Gaussianity CMB Cosmic Microwave Background Mesoscopic Systems No statistically-significant signalsFull counting statistics Cumulants up to 5 th order Planck, 2013 Gustavsson+, Surf.Sci.Rep.64,191(2009)

Non-Gaussianity in HIC  Ratio of conserved charges  Critical enhancement  Sign change  Strange confinement  Distribution funcs themselves Morita+(2013); Nakamura (Wed.) Asakawa,Ejiri,MK (2009); Friman+(2011); Stephanov(2011) Stephanov(2009) Ejiri,Karsch,Redlich(2005) BNL-Bielefeld(2013)

Ratio of Cumulants Ejiri, Karsch, Redlich, 2005 hadronic quark-gluon

Strange Confinement Baryonic Strangeness baryons confined something else strangeness confined something else BNL-Bielefeld,PRL(2013) H.T. Ding, This Morning Many lattice studies (LAT-HIC crossover): Budapest-Wuppertal, 2013; BW, ; BNL-Bi., ; Gupta+, ; Ratti, Wed.; Schmidt, Wed.; Nakamura, Wed.; Sharma, J-13

Proton Number Cumulants at RHIC-BES STAR 2012 STAR, PRL112,032302(2014)  Exp. results are close to and less than Poissonian values.  Something interesting around

Effects of Various Contributions  Initial fluctuations  Effect of jets  Negative binomial (?)  Final state rescattering  Coordinate vs pseudo rapidities  Particle missID  Efficiency correction  Global charge conservation Enhance Enhance to Poisson Suppress

Caution!! proton number cumulants baryon number cumulants Let’s clarify their relation! MK, Asakawa (2012;2012)

Nucleon isospin and a coin N p n MK, Asakawa,2012 Nucleon has two isospin states. A coin has two sides. a coin

Slot Machine Analogy = +

Reconstructing Total Coin Number

Charge Exchange Reaction mean reaction time < 5fm/c :1 1:2 cross sections of p decay rates of  Isospin of N is not frozen at chemical freezeout!

Nucleons in Hadronic Medium time hadronize mesons baryons so many pions rare NN collisions no quantum corr. chem. f.o. kinetic f.o. NOTE:

Difference b/w N B and N p genuine info.noise net-cumulants deviate from thermal value But, are Poissoian Assumptions: Proton number cumulants are dominated by Poissonian noise cf.) Nahrgang+, arXiv:

Efficiency Correction for Particle missID: Ono,Asakawa,MK, PRC,2013 MK, Asakawa, 2012 Bdzak, Koch, 2012 STAR, 2013 If efficiency for each particle is uncorrelated binomial correction to distribution function STAR, arXiv: Electric charge

More Information on/from Fluctuations  dependence MK, Asakawa, Ono,PLB728, 386 (2014)

 Dep. of Non-Gaussianity How does the 4-th order cumulant behave as a function of  ? enhance? suppress?

Fluctuating Hydrodynamics?  Distributions in experiments are close to Poissonian  Cumulants are expected to increase in the hadronic medium These behaviors cannot be described by the theory of hydrodynamic fluctuations

Nucleons in Hadronic Medium time hadronize mesons baryons chem. f.o. kinetic f.o. Baryons in hadronic medium behave like Browinian pollen

Diffusion Master Equation Divide spatial coordinate into discrete cells Master Equation probability Solve the DME exactly, and take a  0 limit MK,Asakawa,Ono,PLB728,386(2014)

hadronization chemical freezeout kinetic freezeout Brownian diffusion Initial condition boost invariance locality of fluctuations small cumulants Comments: agreement with stochastic diffusion eq. up to Gaussian fluctuaion Poisson (Skellam) distribution in equilibrium: consistent with HRG

4 th order Cumulant at ALICE MK, Asakawa,Ono (2014) Sakaida+, poster I-35 rapidity coverage at ALICE 4 th order cumulant is sensitive to initial fluctuation / transport property / confinement It can be non-monotonic and negative!

 Dep. of Non-Gaussianity How does the 4-th order cumulant behave as a function of  ? enhance? suppress?

Suggestions to Experimentalists  many conserved charges   window dependences primordial thermodynamics, transport property, confinement no normalization  various cumulants electric charge, baryon number, (and strangeness?) with different diffusion constans second, third, fourth, mixed, (and much higher?)  Beam Energy Scan LHC, RHIC-BES, FAIR, NICA, J-PARC, …

My Messages  Fluctuations are invaluable observables in HIC  But, we must understand them in more detail  It’s possible, interesting, and important primordial thermodynamics, confinement nature, transport property, LAT-HIC crossover, etc. qualitative difference between RHIC and LHC real baryon number fluc. / various corrections / thermal or non-thermal We are just arriving at the starting point to explore QCD phase structure with fluctuations!

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 Dependence at STAR  Dependence at STAR STAR, QM2012 decreases as  becomes larger at RHIC energy.

3 rd & 4 th Order Fluctuations 3 rd & 4 th Order Fluctuations

Strange Baryons Strange Baryons Decay modes: Decay Rates: Regarding these ratios even, protons from these decays is incorporated into the binomial distribution. Then, N N  N B

 Dependence at Freezeout  Dependence at Freezeout Initial fluctuations: 2nd 4th parameter sensitive to hadronization

Total Charge Number Total Charge Number In recombination model, 6 quarks 6 antiquarks  can fluctuate, while does not.