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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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Statistical interpretation of multiplicity distributions and forward-backward multiplicity correlations in relativistic heavy ion collisions

华中师范大学

付菁华


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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  ⇒


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Long range correlations is not the only explanation

When there is no correlations between particles,

b also could be constant as a function of 


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Binomial with probability 1/2 to fall into either hemisphere

b is also determined by the multiplicity distributions


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PHENIX 0-10%

PRC76,034903(07)

Multiplicity distributions

The solid curves:

fit results of Negative Binomial Distribution


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Fitting results


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: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


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STAR 0-10% Au+Au

Total b

K is always constant

<n> is constant in

central rapidity

region

⇒ b is constant


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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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