K∗(892)0 and φ(1020) meson production at high transverse momentum in pp and Pb-Pb collisions at s NN =2.76 TeV

J. Adam, D. Adamova, M.M Aggarwal, G Aglieri Rinella, M. Agnello, N Agrawal, Peter Christiansen, Martin Ljunggren, Anders Oskarsson, Tuva Richert, David Silvermyr, Evert Stenlund, Vytautas Vislavicius, ALICE Collaboration

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The production of K∗(892)0 and φ(1020) mesons in proton-proton (pp) and lead-lead (Pb-Pb) collisions at sNN=2.76TeV has been analyzed using a high luminosity data sample accumulated in 2011 with the ALICE detector at the Large Hadron Collider (LHC). Transverse momentum (pT) spectra have been measured for K∗(892)0 and φ(1020) mesons via their hadronic decay channels for pT up to 20GeV/c. The measurements in pp collisions have been compared to model calculations and used to determine the nuclear modification factor and particle ratios. The K∗(892)0/K ratio exhibits significant reduction from pp to central Pb-Pb collisions, consistent with the suppression of the K∗(892)0 yield at low pT due to rescattering of its decay products in the hadronic phase. In central Pb-Pb collisions the pT dependent φ(1020)/π and K∗(892)0/π ratios show an enhancement over pp collisions for pT≈3GeV/c, consistent with previous observations of strong radial flow. At high pT, particle ratios in Pb-Pb collisions are similar to those measured in pp collisions. In central Pb-Pb collisions, the production of K∗(892)0 and φ(1020) mesons is suppressed for pT>8GeV/c. This suppression is similar to that of charged pions, kaons, and protons, indicating that the suppression does not depend on particle mass or flavor in the light quark sector. © 2017 CERN.
Original languageEnglish
Article number064606
JournalPhysical Review C: covering nuclear physics
Issue number6
Publication statusPublished - 2017

Bibliographical note

Export Date: 4 July 2017

Subject classification (UKÄ)

  • Subatomic Physics


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