$φ$-meson production at forward rapidity in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV and in pp collisions at $\sqrt{s}$ = 2.76 TeV

Submission Date: 
30/06/2015
Article Information
Submission Form
System: 
p-Pb
Energy: 
5.02 TeV
Abstract Plain Text: 

The first measurement of $\phi$-meson production in p-Pb collisions at forward and backward rapidity, at a
nucleon-nucleon centre-of-mass energy $\snn = 5.02$~TeV, has been
performed with the ALICE apparatus at the LHC.
$\phi$-mesons have been identified in the dimuon decay channel in the
transverse momentum ($\pt$) range $1 < \pt < 7$~GeV/$c$, both
in the p-going ($2.03 <y < 3.53$) and the Pb-going ($-4.46 < y < -2.96$)
directions, where $y$ stands for the rapidity in the nucleon-nucleon centre-of-mass. Differential cross sections as a function of transverse momentum and
rapidity are presented. The forward-backward asymmetry for $\phi$
meson production is measured for $2.96<|y|<3.53$,
showing no significant $\pt$ dependence within the uncertainties.
The $\pt$ dependence of the $\phi$ nuclear modification factor $\RpPb$
exhibits an enhancement up to a factor~1.6 at $\pt = 3$-4~GeV/$c$
in the Pb-going direction.
The $\pt$ dependence of the $\phi$-meson cross section in pp
collisions at $\sqrt{s} = 2.76$~TeV, which is used to determine a
reference for the p-Pb results, is also presented here for $1 < \pt < 5$~GeV/$c$ and $2.5 <y < 4$.