Pseudorapidity dependence of multiplicity and transverse momentum fluctuations in pp collisions at SPS energies

Abstract

A search for the critical behavior of strongly interacting matter was performed at the NA61/SHINE experiment by studying event-by-event fluctuations of multiplicity and transverse momentum of charged hadrons produced in inelastic p+p collisions at 20, 31, 40, 80 and 158 GeV/c beam momentum. Results for the energy dependence of the scaled variance of the multiplicity distribution and for two families of strongly intensive measures of multiplicity and transverse momentum fluctuations $\Delta [P_T,N]$ and $\Sigma [P_T,N]$ are presented. These quantities were studied in different pseudorapidity intervals, which correspond to changing the baryon chemical potential and the temperature at the freeze-out stage. The strongly intensive measures $\Delta [N_F,N_B]$ and $\Sigma [N_F,N_B]$ were also used in the analysis of short- and long-range multiplicity correlations. Results on multiplicity and transverse momentum fluctuations significantly depend on the charges of the selected hadrons and the width and/or location of pseudorapidity intervals. The event generator EPOS does not describe the data for the $\Delta [P_T,N]$ measure, but provides a fair description of $\Sigma [P_T,N]$. The measure $\Sigma [N_F,N_B]$ of forward-backward fluctuations is reproduced reasonably well by the EPOS model.

5 pages, 4 figures, to appear in the proceedings of the 3rd International Conference on Particle Physics and Astrophysics, Moscow, Russia, 2-5 October 2017

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