PAO-TI CHANGStathes PaganisKAI-FENG CHENRONG-SHYANG LUWEI-SHU HOU2020-01-152020-01-152019https://scholars.lib.ntu.edu.tw/handle/123456789/449566Measurements of the pseudorapidity distributions of charged hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of s 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< 3.2 is determined using the silicon pixel detector in the CMS tracking system. For the 5% most central collisions, the chargedhadron pseudorapidity density in the midrapidity region< 0.5 is found to be 1187 36 (syst), with a negligible statistical uncertainty. The rapidity distribution of charged hadrons is also presented in the range |y| < 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.[SDGs]SDG7journal article10.1016/j.physletb.2019.1350492-s2.0-85074402046https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074402046&doi=10.1016%2fj.physletb.2019.135049&partnerID=40&md5=d06587d86cec19c8ec48a61136c8ad2e