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arXiv · 1201.6382

KNO scaling of fluctuations in pp and pA, and eccentricities in heavy-ion collisions

Adrian Dumitru·Yasushi Nara
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Abstract

Multiplicity fluctuations at midrapidity in p+p collisions at high energies are described by a negative binomial distribution and exhibit approximate Koba-Nielsen-Olesen (KNO) scaling. We find that these KNO fluctuations are important also for reproducing the multiplicity distribution in d+Au collisions observed at RHIC, adding to the Glauber fluctuations of the number of binary collisions or participants. We predict that the multiplicity distribution in p+Pb collisions at the LHC also deviates little from the KNO scaling function. Finally, we analyze various moments of the eccentricity of the particle production zone in A+A collisions at RHIC and LHC and find that particle production fluctuations increase fluctuation dominated moments such as the triangularity epsilon_3 substantially.

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Adrian Dumitru, Yasushi Nara. 2012-03-09. KNO scaling of fluctuations in pp and pA, and eccentricities in heavy-ion collisions. https://doi.org/10.1103/physrevc.85.034907

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