# Pseudorapidity distributions of charged hadrons in xenon-xenon collisions at root S-NN=5.44 TeV

 Preview
PDF - Accepted Version - article

 Preview
PDF - Published Version - article

## Abstract

Measurements of the pseudorapidity distributions of charged hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of $\sqrt{; ; s_\mathrm{; ; NN}; ; }; ; =$ 5.44 TeV are presented. The measurements are based on data collected by the CMS experiment at the LHC. The yield of primary charged hadrons produced in xenon-xenon collisions in the pseudorapidity range $|\eta|$ $&lt;$ 3.2 is determined using the silicon pixel detector in the CMS tracking system. For the 5% most central collisions, the charged-hadron pseudorapidity density in the midrapidity region $|\eta|$ $&lt;$ 0.5 is found to be 1187 $\pm$ 36 (syst), with a negligible statistical uncertainty. The rapidity distribution of charged hadrons is also presented in the range $|y|$ $&lt;$ 3.2 and is found to be independent of rapidity around $y =$ 0. Existing Monte-Carlo event generators are unable to simultaneously describe both results. Comparisons of charged-hadron multiplicities between xenon-xenon and lead-lead collisions at similar collision energies show that particle production at midrapidity is strongly dependent on the collision geometry in addition to the system size and collision energy.

Item Type: Article High energy physics ; Experimental particle physics ; LHC ; CMS ; Physics ; Beyond two generations ; Excited top quark ; Hadron-Hadron scattering (experiments) ; Supersymmetry ; Beyond Standard Model ; Lepton production ; Data acquisition concepts ; Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases) ; Modular electronics ; Optical detector readout concepts ; Particle Physics Experiments ; Data ; Higgs ; Muon NATURAL SCIENCES > Physics Division of Experimental Physics Dinko Ferenček 05 May 2020 12:20 05 May 2020 12:22 http://fulir.irb.hr/id/eprint/5726 10.1016/j.physletb.2019.135049

### Actions (login required)

 View Item