Production of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The production of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons in proton-proton (pp) and lead-lead (Pb-Pb) collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV has been measured using the ALICE detector at the Large Hadron Collider (LHC). The transverse momentum ($p_{\mathrm{T}}$) distributions of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons have been measured at midrapidity $(|y|<0.5)$ up to $p_{\mathrm{T}}=20$ GeV$/c$ in inelastic pp collisions and for several Pb-Pb collision centralities. The collision centrality and collision energy dependence of the average transverse momenta agree with the radial flow scenario observed with stable hadrons, showing that the effect is stronger for more central collisions and higher collision energies. The ${\mathrm{K}}^{\ast 0}/K$ ratio is found to be suppressed in Pb-Pb collisions relative to pp collisions: this indicates a loss of the measured K${}^{\ast }(892{)}^0$ signal due to rescattering of its decay products in the hadronic phase. In contrast, for the longer-lived $\varphi (1020)$ mesons, no such suppression is observed. The nuclear modification factors ($R_{\mathrm{AA}}$) of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons are calculated using pp reference spectra at the same collision energy. In central Pb-Pb collisions for $p_{\mathrm{T}}>8$ GeV$/c$, the $R_{\mathrm{AA}}$ values of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ are below unity and observed to be similar to those of pions, kaons, and (anti)protons. The $R_{\mathrm{AA}}$ values at high $p_{\mathrm{T}}$ ($>$~8 GeV$/c$) for K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons are in agreement within uncertainties for $\sqrt{s_{\mathrm{NN}}}=5.02$ and 2.76 TeV.

34 pages, 15 captioned figures, 3 tables, authors from page 29, published version, figures at http://alice-publications.web.cern.ch/node/7203

References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Herwig++ Physics and Manual
• Glauber Modeling in High Energy Nuclear Collisions
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• K*(892)${}^0$ and $\Phi$(1020) production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV
• Measurements of $\varphi$ meson production in relativistic heavy-ion collisions at RHIC
• Nuclear modification factors of phi mesons in d+Au, Cu+Cu and Au+Au collisions at sqrt(S_NN)=200 GeV
• Hadronic resonance production in $d$+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV at RHIC
• Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV

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• $K^{\ast 0}$ meson production using a transport and a statistical hadronization model at energies covered by the RHIC beam energy scan
• System size dependence of the hadronic rescattering effect at energies available at the CERN Large Hadron Collider
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• QCD phase transition at finite temperature and chemical potential with the non-extensive statistics
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• Investigation of Nuclear Modification Factor from RHIC to LHC energies using Boltzmann Transport equation in conjunction with q-Weibull distribution