1201.6382 (Adrian Dumitru et al.)

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

Adrian Dumitru, Yasushi Nara

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.

View original: http://arxiv.org/abs/1201.6382