K{*}(892)(0) and phi(1020)meson production at high transverse momentum in pp and Pb-Pb collisions at root sNN=2.76 TeV
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Abstract
The production of K{*}(892)(0) and phi(1020) mesons in proton-proton
(pp) and lead-lead (Pb-Pb) collisions at root sNN = 2.76 TeV has been
analyzed using a high luminosity data sample accumulated in 2011 with
the ALICE detector at the Large Hadron Collider (LHC). Transverse
momentum (p(T)) spectra have been measured for K{*}(892)(0) and
phi(1020) mesons via their hadronic decay channels for p(T) up to 20
GeV/c. The measurements in pp collisions have been compared to model
calculations and used tto 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 phi(1020)/p and K{*}(892)0/p ratios show an enhancement over
pp collisions for pT approximate to 3 GeV/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 phi(1020) mesons is
suppressed for p(T) > 8 GeV/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.... Show more Show less