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

Abstract

The first study of $\varphi$-meson production in p-Pb collisions at forward and backward rapidity, at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV, has been performed with the ALICE apparatus at the LHC. The $\varphi$-mesons have been identified in the dimuon decay channel in the transverse momentum ($p_{\mathrm{T}}$) range $1<p_{\mathrm{T}}<7$ 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 $5.01\pm 0.19$~nb${}^{-1}$ and $5.81\pm 0.20$~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 $\varphi$-meson production is measured for $2.96<|y|<3.53$, resulting in a ratio $\sim 0.5$ with no significant $p_{\mathrm{T}}$ dependence within the uncertainties. The $p_{\mathrm{T}}$ dependence of the $\varphi$ nuclear modification factor $R_{\mathrm{pPb}}$ exhibits an enhancement up to a factor 1.6 at $p_{\mathrm{T}}$ = 3-4 GeV/$c$ in the Pb-going direction. The $p_{\mathrm{T}}$ dependence of the $\varphi$-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 $1<p_{\mathrm{T}}<5$ GeV/$c$ and $2.5<y<4$ for a $78\pm 3$~nb${}^{-1}$ integrated luminosity sample.

25 pages, 6 captioned figures, 7 tables, authors from page 20, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1699

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• Using the Tsallis distribution for hadron spectra in $pp$ collisions: Pions and quarkonia at $\sqrt{s}$ = 5--13000 GeV
• Observables for possible QGP signatures in central pp collisions
• Study of J/$\psi$ azimuthal anisotropy at forward rapidity in Pb-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV
• $\varphi$ meson production in the forward/backward rapidity region in Cu$+$Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Energy dependence of $\varphi$ meson production at forward rapidity in pp collisions at the LHC
• Multiplicity and rapidity dependence of ${\mathrm{K}}^{\ast }(892{)}^0$ and $\varphi (1020)$ production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• $\varphi$ meson production at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Particle species and energy dependencies of freeze-out parameters in high-energy proton-proton collisions
• Measurement of $\varphi$-meson production at forward rapidity in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV and energy dependence of ${\sigma }_{\varphi }$ from $\sqrt{s}$=200 GeV to 7 TeV
• Phi Meson Measurements at RHIC with the PHENIX Detector