Two freeze-out model for the hadrons produced in the Relativistic Heavy-Ion Collisions. New Frontiers in QCD 28 Oct, 2011, Yonsei Univ., Seoul, Korea Suk.

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Presentation transcript:

Two freeze-out model for the hadrons produced in the Relativistic Heavy-Ion Collisions. New Frontiers in QCD 28 Oct, 2011, Yonsei Univ., Seoul, Korea Suk Choi, Kang Seog Lee Chonnam National University

What can we know from particle spectra? Hadron yield : chemical freeze-out temperature baryon and strange chemical potential strange saturation factor P t -spectra : thermal freeze-out temperature chemical potentials(baryon, strange,…) system size, transverse expansion velocity

1.Chemical analysis Multiplicities or ratios of hadrons are nicely fitted with statistical distributions. parameters : T ch,  B,ch,  s,ch,  s = T ch at RHIC energy is close to the phase transition temperature to QGP. = The hadrons are chemically frozen out just after the hadronization. =  s close to 1, and the strangeness is nearly equilibrated. Analysis 1.

2. Thermal analysis The slopes of p t spectra are well explained with expanding fireball model when absolute magnitude for each hadrons is arbitrary adjusted. parameters : T th,  B,th,  s,th,  = The success of thermal analysis (p t < 2GeV/c) is the evidence of the radial expansion. Analysis 2. J. Adams et al. [STAR Collaboration] 2004, Phys. Rev. Lett

1.The temperatures of the two analysis are different, T ch  T th. 2.The magnitudes and slopes of transverse momentum spectra of various hadrons cannot be fitted simultaneously. ?  Chemical freeze-out occurs earlier at high temperature than thermal freeze- out.  The inelastic collisions becomes less frequent.  The numbers of each hadron species are no more changing thus kept fixed.  The system expand continuing with elastic collisions. U. Heinz, AIP conf. Proc. 602: , 2001

Cooper-Frye Formula H. Dobler, J. Sollfrank, U. Heinz, P. L. B457,353(1999) J. D. Bjorken, Phys. Rev. D Vol. 27, 1 F. Cooper and G. Frye, Phys. Rev. D 10, 140(1974) For an ellipsoidally expanding fireball Blast-wave model

Hadron yields, slopes and magnitude of m t spectra of various hadrons can be simultaneously explained within a single model. Consistent way of analyzing both the ratios and p t spectrum N i th is fixed. Calculate chemical potential of each particles mi from N i th. Thermal freeze-out Find thermal freeze out parameters to fit m t spectra using  i. Resonance contribution should be included. T ch T th  Chemical freeze out : Number of each particles is fixed.

Chemical analysis Total Particle Number Chemical Potential T>T ch : The hot and dense system is chemically equilibrated. T<T ch : All kind of hadrons are frozen out and the number of hadrons are fixed.

Transverse Mass Spectrum Chemical Potential from particle ratios fixed at T ch. Thermal analysis Hadron ratios at chemical freeze-out time

Strength of two freeze-out model 1.Two freeze-out model causes a small errors but reduces the computation significantly since the coupled equations for the chemical potentials now reduces to independent equations. 2.Two freeze-out model can explain ratios of hadrons, transverse momentum spectrum of each hadrons without arbitrary normalizations and rapidity distribution of charged hadrons.

Results of chemical analysis T ch =173.4 MeV  B =18.5 MeV  s =7.9 MeV  s =0.986  2 /n=1.4 T ch =173.9 MeV  B =26.4 MeV  s =6.0 MeV  s =1.01  2 /n=0.12

Result of thermal analysis T th =121.1 MeV   =126.4 MeV  max =5.0  0 =1.03  s =0.986  2 /n=5.3

Result of rapidity distribution T th =121.1 MeV   =126.4 MeV  max =5.0  0 =1.03  s =0.986

Conclusion 1.In an cylindrically expanding fireball model, both the hadron ratios, magnitude and slopes of the p t spectra at RHIC are described assuming two freeze-outs. 2. Particle p t and rapidity spectra are nicely fitted without arbitrary normalization. 3. We are eagerly waiting for LHC data to analyze.

I’ll give you chance which you can give me the LHC data (rapidity, Pt, ratios of particles). Contact to me : Thanks ! ^.*

Reference [1] K. S. Lee, U. Heintz, E. Schnedermann : Z. Phys. C - Particles and Fields 48(1990) [2] K. S. Lee, U. Heintz, Z. Phys. C43 (1989) [3] H. Dobler, J. Sollfrank, U. Heintz, [nucl-th/ ] [4] B. Pin-zhen, J Rafalski, [nucl-th/ ] [5] J. D. Bjorken, Physical Review D Vol. 27, Num. 1, January(1983) [6] J. Sollfrank, P. Koch, U. Heintz, Z. Phys. Rev. Lett (1997) [7] L. Landau, Izv. Akg. Nauk SSSR, 17, 51 (1953). [8] F. Cooper and G. Frye, Phys. Rev. D 10, 140(1974) [9] U. Heinz, AIP Conf. Proc. 602, 281 (2001), [hep-ph/ ] [10] J. Adams et al. (STAR), Phys. Rev. Lett. 92 (2004) [nucl-ex/ ]. [11] J. Adams et al. (STAR), Phys. Lett. B 612 (2005) 181[nucl-ex/ ]. [12] J. Adams et al. (STAR), Phys. Rev. C 71 (2005) [nucl-ex/ ]. [13] A. Billmeier et al. (STAR), J. Phys. G 30 (2004) S363. [14] H. Zhang (STAR) [nucl-ex/ ]. [15] O. Barannikova (STAR) [nucl-ex/ ]. [16] Quark Gluon Plasma [17] STAR collaboration, Nucl. Phys. A757 : (2005) [18] J. L. Klay et al.[E-0895] Collaboration], Phys. Rev. C 68, (2003) [nucl-ex/ ]