$\phi$-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

J. Adam , Laurent Aphecetche (1) , B. Audurier (1) , A. Baldisseri (2) , Guillaume Batigne (1) , I. Belikov (3) , H. Borel (2) , J. Castillo Castellanos (2) , J.L. Charvet (2) , C. Cheshkov (4) , B. Cheynis (4) , L. Ducroux (4) , Marie Germain (1) , J.-Y. Grossiord (4) , B. Hippolyte (3) , A. Lardeux (2) , A. Maire (3) , J. Martin Blanco (1) , Gines Martinez Garcia (1) , L. Massacrier (1) , L. Molnar (3) , D.A. Moreira De Godoy (1) , A. Morreale (1) , H. Pereira Da Costa (2) , Philippe Pillot (1) , L. Ronflette (1) , Y. Schutz (1) , Alexandre Shabetai (1) , Diego Stocco (1) , B. Teyssier (4) , R. Tieulent (4) , A. Uras (4) , R. Vernet (5) , M. Wang (1) , G. Conesa Balbastre (6) , J. Faivre (6) , C. Furget (6) , R. Guernane (6) , J.S. Real (6) , C. Silvestre (6) , A. Vauthier (6) , Z. Conesa Del Valle (7) , I. Das (7) , B. Espagnon (7) , C. Hadjidakis (7) , I. Lakomov (7) , C. Suire (7) , J. D. Tapia Takaki (7) , M. Tarhini (7) , L. Valencia Palomo (7)

1 SUBATECH - Laboratoire SUBATECH Nantes
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 IPHC - Institut Pluridisciplinaire Hubert Curien
4 IPNL - Institut de Physique Nucléaire de Lyon
5 CC-IN2P3 - Centre de Calcul de l'IN2P3
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 IPNO - Institut de Physique Nucléaire d'Orsay

The first measurement of $\phi$-meson production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\rm NN}}$ = 5.02 TeV has been performed with the ALICE apparatus at the LHC. The $\phi$-mesons have been identified in the dimuon decay channel in the transverse momentum ($p_{\rm T}$) range $1 < p_{\rm T} < 7$ 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 $2.96<|y|<3.53$, resulting in a factor $\sim 0.5$ with no significant $p_{\rm T}$ dependence within the uncertainties. The $p_{\rm T}$ dependence of the $\phi$ nuclear modification factor $R_{\rm pPb}$ exhibits an enhancement up to a factor 1.6 at $p_{\rm T}$ = 3-4 GeV/$c$ in the Pb-going direction. The $p_{\rm T}$ 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 $1 < p_{\rm T} < 5$ GeV/$c$ and $2.5

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique des Hautes Energies - Expérience [hep-ex]

J. Adam, Laurent Aphecetche, B. Audurier, A. Baldisseri, Guillaume Batigne, et al.. $\phi$-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. Physics Letters B, 2017, 768, pp.203-217. ⟨10.1016/j.physletb.2017.01.074⟩. ⟨in2p3-01170083v1⟩