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华中师范大学 付菁华

Statistical interpretation of multiplicity distributions and forward-backward multiplicity correlations in relativistic heavy ion collisions. 华中师范大学 付菁华. . 0. Forward-backward multiplicity correlations. STAR 0-10% Au+Au. Total b. Long range. Short. Int. J. Mod. Phys. E16, 3371(07).

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华中师范大学 付菁华

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  1. Statistical interpretation of multiplicity distributions and forward-backward multiplicity correlations in relativistic heavy ion collisions 华中师范大学 付菁华

  2. 0 Forward-backward multiplicity correlations STAR 0-10% Au+Au Total b Long range Short Int. J. Mod. Phys. E16, 3371(07) Long-range correlations b almost stays constant as a function of  ⇒

  3. Long range correlations is not the only explanation When there is no correlations between particles, b also could be constant as a function of 

  4. 0 Binomial with probability 1/2 to fall into either hemisphere b is also determined by the multiplicity distributions

  5. PHENIX 0-10% PRC76,034903(07) Multiplicity distributions The solid curves: fit results of Negative Binomial Distribution

  6. Fitting results

  7. 0 :total multiplicity of an event :multiplicity in any smaller phase space interval Multiplicity fluctuations in small phase space Are largely determined by Overall multiplicity fluctuations Overall multiplicity fluctuations Are closely related to fluctuations in nuclear geometry

  8. STAR 0-10% Au+Au Total b K is always constant <n> is constant in central rapidity region ⇒ b is constant

  9. Conclusion: When there is no correlations between particles, Geometry fluctuations induced overall multiplicity fluctuations could also lead to Nonzero constant b as a function of  Measure both 0-5% and 0-10% centrality Dynamical: 0-5% larger Geometry: 0-10% larger Thanks!

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