Abstract
The transverse momentum distributions of the strange and double-strange hyperon resonances (Sigma (1385)^{pm }, Xi (1530)^{0}) produced in p–Pb collisions at sqrt{s_{mathrm{NN}}}= 5.02 TeV were measured in the rapidity range -0.5< y_mathrm {CMS}<0 for event classes corresponding to different charged-particle multiplicity densities, langle dN_{mathrm{ch}}/deta _{mathrm{lab}}rangle . The mean transverse momentum values are presented as a function of langle dN_{mathrm{ch}}/deta _{mathrm{lab}}rangle , as well as a function of the particle masses and compared with previous results on hyperon production. The integrated yield ratios of excited to ground-state hyperons are constant as a function of langle dN_{mathrm{ch}}/deta _{mathrm{lab}}rangle . The equivalent ratios to pions exhibit an increase with langle dN_{mathrm{ch}}/deta _{mathrm{lab}}rangle , depending on their strangeness content.
Highlights
Hadrons containing one or more strange quarks have been studied extensively over past decades in connection with the study of quark-gluon plasma [1,2]
For the analysed p–Pb data set, the direction of the proton beam was towards the ALICE muon spectrometer, the so-called “C” side, standing for negative rapidities; the Pb beam circulated towards positive rapidities, labelled as “A” side in the following
Transverse momen√tum spectra of ∗± and ∗0 produced in p–Pb collisions at sNN = 5.02 TeV have been measured, and the yields and mean pT values have been extracted with the help of Lévy–Tsallis fits
Summary
Hadrons containing one or more strange quarks have been studied extensively over past decades in connection with the study of quark-gluon plasma [1,2]. Enhanced hyperon yields were observed in heavy-ion collisions with respect to those measured in proton-proton (pp) collisions at the same centreof-mass energy [3,4,5,6]. These enhancements were found to be consistent with those expected from thermal statistical model calculations using a grand canonical ensemble [7]. The canonical [8,9] approach is suggested to explain the relatively suppressed multi-strange baryon yields in smaller collision systems such as pp, proton-nucleus (p–Pb) and peripheral heavy-ion collisions [10]. The observed decrease of the resonance to ground-state ratio K∗0/K− has been suggested as an indication of re-scattering processes in the hadronic medium, as first observed in Pb–Pb collisions [15]
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