ϕ-Meson production at forward rapidity in p–Pb collisions at and in pp collisions at
The first study of $$\phi$$-meson production in p–Pb collisions at forward and backward rapidity, at a nucleon–nucleon centre-of-mass energy 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 p T =3–4 GeV/c in the Pb-going direction. The p T dependence of the $$\phi$$-meson cross section in pp collisions at 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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- The ALICE Collaboration
- Grant/Contract Number:
- AC52-07NA27344; AC02-05CH11231
- OSTI ID:
- 1405519
- Alternate ID(s):
- OSTI ID: 1395298; OSTI ID: 1415970
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 768 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
$\phi$-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
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text | January 2017 |
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