${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV

Abstract

The production of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ resonances has been measured in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV using the ALICE detector. Resonances are reconstructed via their hadronic decay channels in the rapidity interval $-$0.5 $<$ $y$ $<$ 0 and the transverse momentum spectra are measured for various multiplicity classes up to $p_{\mathrm{T}}$ = 20 GeV/$c$ for ${\mathrm{K}}^{\ast }(892{)}^0$ and $p_{\mathrm{T}}$ = 16 GeV/$c$ for $\varphi (1020)$. The $p_{\mathrm{T}}$ -integrated yields and mean transverse momenta are reported and compared with previous results in pp, p-Pb and Pb-Pb collisions. The $x_{\mathrm{T}}$ scaling for ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ resonance production is newly tested in p-Pb collisions and found to hold in the high-$p_{\mathrm{T}}$ region at Large Hadron Collider energies. The nuclear modification factors ($R_{\mathrm{pPb}}$) as a function of $p_{\mathrm{T}}$ for ${\mathrm{K}}^{\ast 0}$ and $\varphi$ at $\sqrt{s_{NN}}$ = 8.16 TeV are presented along with the new $R_{\mathrm{pPb}}$ measurements of ${\mathrm{K}}^{\ast 0}$, $\varphi$ , $\Xi$, and $\Omega$ at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. At intermediate $p_{\mathrm{T}}$ (2-8 GeV/$c$), $R_{\mathrm{pPb}}$ of $\Xi$, $\Omega$ show a Cronin-like enhancement, while ${\mathrm{K}}^{\ast 0}$ and $\varphi$ show no or little nuclear modification. At high $p_{\mathrm{T}}$ ($>$ 8 GeV/$c$), the $R_{\mathrm{pPb}}$ values of all hadrons are consistent with unity within uncertainties. The $R_{\mathrm{pPb}}$ of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 and 5.02 TeV show no significant energy dependence.

31 pages, 9 captioned figures, 3 tables, authors from page 25, published version, figures at http://alice-publications.web.cern.ch/node/7430

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• The ALICE experiment: a journey through QCD
• System size dependence of the hadronic rescattering effect at energies available at the CERN Large Hadron Collider
• Multiplicity and rapidity dependence of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV