Centrality dependence of freeze-out temperature fluctuations in Pb-Pb collisions at the LHC


Many data in the High Energy Physics are, in fact, sample means. It is shown that when this exact meaning of the data is taken into account and the most weakly bound states are removed from the hadron resonance gas, the whole spectra of pions, kaons and protons measured at midrapidity in Pb-Pb collisions at \( \sqrt{s_{NN}} = 2.76\) TeV can be fitted simultaneously. The invariant distributions are predicted with the help of the single-freeze-out model in the chemical equilibrium framework. The method is applied to the measurements in centrality bins of Pb-Pb collisions and gives acceptable fits for all but peripheral bins. The comparison with the results obtained in the framework of the original single-freeze-out model is also presented. Some more general, possible implications of this approach are pointed out.


  1. 1

    S. Leupold et al., Lect. Notes Phys. 814, 39 (2011)

    ADS  Article  Google Scholar 

  2. 2

    P. Huovinen, Int. J. Mod. Phys. E 22, 1330029 (2013)

    ADS  Article  Google Scholar 

  3. 3

    P. Braun-Munzinger, K. Redlich, J. Stachel, Quark-Gluon Plasma 3 (World Scientific, Singapore, 2004) pp. 491--599

    Google Scholar 

  4. 4

    U.W. Heinz, arXiv:hep-ph/0407360, unpublished

  5. 5

    W. Broniowski, W. Florkowski, Phys. Rev. Lett. 87, 272302 (2001)

    ADS  Article  Google Scholar 

  6. 6

    W. Broniowski, W. Florkowski, Phys. Rev. C 65, 064905 (2002)

    ADS  Article  Google Scholar 

  7. 7

    ALICE Collaboration (B. Abelev et al.), Phys. Rev. Lett. 109, 252301 (2012)

    ADS  Article  Google Scholar 

  8. 8

    ALICE Collaboration (B. Abelev et al.), Phys. Rev. C 88, 044910 (2013)

    ADS  Article  Google Scholar 

  9. 9

    J. Stachel, A. Andronic, P. Braun-Munzinger, K. Redlich, J. Phys. Conf. Ser. 509, 012019 (2014)

    Article  Google Scholar 

  10. 10

    I. Melo, B. Tomasik, J. Phys. G 43, 015102 (2016)

    ADS  Article  Google Scholar 

  11. 11

    M. Floris, Nucl. Phys. A 931, 103 (2014)

    ADS  Article  Google Scholar 

  12. 12

    P. Huovinen, P.M. Lo, M. Marczenko, K. Morita, K. Redlich, C. Sasaki, Phys. Lett. B 769, 509 (2017)

    ADS  Article  Google Scholar 

  13. 13

    V. Vovchenko, M.I. Gorenstein, H. Stoecker, Phys. Rev. C 98, 034906 (2018)

    ADS  Article  Google Scholar 

  14. 14

    D. Prorok, J. Phys. G 43, 055101 (2016)

    ADS  Article  Google Scholar 

  15. 15

    D. Prorok, Acta Phys. Pol. B 40, 2825 (2009)

    ADS  Google Scholar 

  16. 16

    L. Milano, CERN-THESIS-2012-251, unpublished

  17. 17

    G. Cowan, Statistical Data Analysis (Oxford University Press, Oxford, 1998)

  18. 18

    F. James, Statistical Methods in Experimental Physics (World Scientific, Singapore, 2006)

    Google Scholar 

  19. 19

    Particle Data Group Collaboration (K.A. Olive et al.), Chin. Phys. C 38, 090001 (2014)

    Article  Google Scholar 

  20. 20

    W. Broniowski, F. Giacosa, V. Begun, Phys. Rev. C 92, 034905 (2015)

    ADS  Article  Google Scholar 

  21. 21

    E. Schnedermann, J. Sollfrank, U. Heinz, Phys. Rev. C 48, 2462 (1993)

    ADS  Article  Google Scholar 

Download references

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Correspondence to Dariusz Prorok.

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Prorok, D. Centrality dependence of freeze-out temperature fluctuations in Pb-Pb collisions at the LHC. Eur. Phys. J. A 55, 37 (2019). https://doi.org/10.1140/epja/i2019-12709-3

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