학술논문
Production of pions, kaons, (anti-)protons and ϕsNN mesons in Xe–Xe collisions at ϕsNN = 5.44 TeV
Document Type
Original Paper
Author
Source
The European Physical Journal C: Particles and Fields. 81(7)
Subject
Language
English
ISSN
1434-6044
1434-6052
1434-6052
Abstract
The first measurement of the production of pions, kaons, (anti-)protons and ϕsNN=5.44TeVpTpTϕ mesons at midrapidity in Xe–Xe collisions at ϕsNN=5.44TeVpTpTϕ is presented. Transverse momentum (ϕsNN=5.44TeVpTpTϕ) spectra and ϕsNN=5.44TeVpTpTϕ-integrated yields are extracted in several centrality intervals bridging from p–Pb to mid-central Pb–Pb collisions in terms of final-state multiplicity. The study of Xe–Xe and Pb–Pb collisions allows systems at similar charged-particle multiplicities but with different initial geometrical eccentricities to be investigated. A detailed comparison of the spectral shapes in the two systems reveals an opposite behaviour for radial and elliptic flow. In particular, this study shows that the radial flow does not depend on the colliding system when compared at similar charged-particle multiplicity. In terms of hadron chemistry, the previously observed smooth evolution of particle ratios with multiplicity from small to large collision systems is also found to hold in Xe–Xe. In addition, our results confirm that two remarkable features of particle production at LHC energies are also valid in the collision of medium-sized nuclei: the lower proton-to-pion ratio with respect to the thermal model expectations and the increase of the ϕsNN=5.44TeVpTpTϕ-to-pion ratio with increasing final-state multiplicity.