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

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

2012-01-30

arxiv.org/abs/1201.6382v2

Phys. Rev. C 85, 034907 (2012)

Physics

Nuclear Physics

Nuclear Theory

7 pages, 6 figures; v2: updated references and a few minor modifications, to appear in PRC

Scientific paper

10.1103/PhysRevC.85.034907

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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