$\phi$-Meson production at forward rapidity in p-Pb collisions at $\sqrt{S_{NN}}$=5.02 TeV and in pp collisions at $\sqrt{S}$=2.76 TeV - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2017

$\phi$-Meson production at forward rapidity in p-Pb collisions at $\sqrt{S_{NN}}$=5.02 TeV and in pp collisions at $\sqrt{S}$=2.76 TeV

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Laurent Aphecetche
B. Audurier
  • Function : Author
B. Cheynis
Marie Germain
B. Hippolyte
  • Function : Author
A. Maire
  • Function : Author
L. Massacrier
  • Function : Author
L. Molnar
  • Function : Author
D.A. Moreira de Godoy
  • Function : Author
A. Morreale
  • Function : Author
Philippe Pillot
L. Ronflette
  • Function : Author
Y. Schutz
  • Function : Author
Alexandre Shabetai
Diego Stocco
R. Vernet
  • Function : Author
M. Wang
  • Function : Author
G. Conesa Balbastre
J. Faivre
  • Function : Author
C. Furget
  • Function : Author
R. Guernane
  • Function : Author
J.S. Real
C. Silvestre
  • Function : Author
A. Vauthier
  • Function : Author
I. Das
  • Function : Author
B. Espagnon
  • Function : Author
C. Hadjidakis
  • Function : Author
I. Lakomov
  • Function : Author
C. Suire
  • Function : Author
J.D. Tapia Takaki
  • Function : Author
M. Tarhini
  • Function : Author
L. Valencia Palomo
  • Function : Author
Guillaume Batigne
I. Belikov
  • Function : Author
Gines Martinez Garcia
J. Martin Blanco
  • Function : Author

Abstract

The first study of $\phi$-meson production in p–Pb collisions at forward and backward rapidity, at a nucleon– nucleon centre-of-mass energy $\sqrt{S_{NN}}$= 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 ($p_T$) range 1 < $p_T$ < 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 — the integrated luminosity amounting to 5.01 ± 0.19 nb$^{−1}$ and 5.81 ± 0.20 nb$^{−1}$ , respectively, for the two data samples. Differential cross sections as a function of transverse momentum and rapidity are presented. The forward–backward ratio for $\phi$-meson production is measured for 2.96 < |y| < 3.53, resulting in a ratio ∼ 0.5 with no significant $p_T$ dependence within the uncertainties. The $p_T$ dependence of the $\phi$ nuclear modification factor R$_{pPb}$ exhibits an enhancement up to a factor 1.6 at $\phi$= 3–4 GeV/c in the Pb-going direction. The $p_T$ 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 < $p_T$ < 5 GeV/c and 2.5 < y < 4, for a 78 ± 3 nb$^{−1}$ integrated luminosity sample.
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Dates and versions

in2p3-01170083 , version 1 (01-07-2015)
in2p3-01170083 , version 2 (31-05-2017)

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J-L. Charvet, V.J.G. Feuillard, A. Rakotozafindrabe, J. Adam, Laurent Aphecetche, et al.. $\phi$-Meson production at forward rapidity in p-Pb collisions at $\sqrt{S_{NN}}$=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⟩. ⟨in2p3-01170083v2⟩
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