Multiplicity and rapidity dependence of K* (892)⁰ and ϕ(1020) production in p–Pb collisions at √ˢɴɴ= 5.02 TeV

Abstract

The transverse-momentum (Pᴛ) spectra of K*(892)⁰ and φ(1020) measured with the ALICE detector up to Pᴛ = 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 √ˢɴɴ = 5.02 TeV are presented as a function of charged particle multiplicity and rapidity. The measured Pᴛ distributions show a dependence on both multiplicity and rapidity at low Pᴛ whereas no significant dependence is observed at high Pᴛ. A rapidity dependence is observed in the Pᴛ-integrated yield (dN/dy), whereas the mean transverse momentum (〈Pᴛ〉) shows a flat behavior as a function of rapidity. The rapidity asymmetry (Yasym) at low Pᴛ (< 5 GeV/c) is more significant for higher multiplicity classes. At high Pᴛ, no significant rapidity asymmetry is observed in any of the multiplicity classes. Both K*(892)⁰ and φ(1020) show similar Yasym. The nuclear modification factor (QCP ) as a function of Pᴛ shows a Cronin-like enhancement at intermediate Pᴛ, which is more prominent at higher rapidities (Pb-going direction) and in higher multiplicity classes. At high Pᴛ (> 5 GeV/c), the QCP values are greater than unity and no significant rapidity dependence is observed.