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

Abstract

The transverse-momentum ($p_{\mathrm{T}}$) spectra of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ measured with the ALICE detector up to $p_{\mathrm{T}}$ = 16 GeV/$c$ in the rapidity range $-1.2<y<0.3$, in p-Pb collisions at the center-of-mass energy per nucleon-nucleon collision $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV are presented as a function of charged particle multiplicity and rapidity. The measured $p_{\mathrm{T}}$ distributions show a dependence on both multiplicity and rapidity at low $p_{\mathrm{T}}$ whereas no significant dependence is observed at high $p_{\mathrm{T}}$. A rapidity dependence is observed in the $p_{\mathrm{T}}$-integrated yield (d$N$/d$y$), whereas the mean transverse momentum ($⟨p_{\mathrm{T}}⟩$) shows a flat behavior as a function of rapidity. The rapidity asymmetry ($Y_{\mathrm{asym}}$) at low $p_{\mathrm{T}}$ ( < 5 GeV/$c$) is more significant for higher multiplicity classes. At high $p_{\mathrm{T}}$, no significant rapidity asymmetry is observed in any of the multiplicity classes. Both ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ show similar $Y_{\mathrm{asym}}$. The nuclear modification factor ($Q_{\mathrm{CP}}$) as a function of $p_{\mathrm{T}}$ shows a Cronin-like enhancement at intermediate $p_{\mathrm{T}}$, which is more prominent at higher rapidities (Pb-going direction) and in higher multiplicity classes. At high $p_{\mathrm{T}}$ (> 5 GeV/$c$), the $Q_{\mathrm{CP}}$ values are greater than unity and no significant rapidity dependence is observed.

arXiv comment28 pages, 10 captioned figures, 1 table, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/7851

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