Browsing by Subject "STRANGENESS"

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    ϕ-Meson production at forward rapidity in p–Pb collisions at √sNN = 5.02 TeV and in pp collisions at √s = 2.76 TeV
    (2017) Adam, J; Adamová, D; Aggarwal, M M; Aglieri Rinella, G; Agnello, M; Agrawal, N; Ahammed, Z; Ahn, S U; Aimo, I; Aiola, S; Ajaz, M; Akindinov, A; Alam, S N; Aleksandrov, D; Alessandro, B; Alexandre, D; Alfaro Molina, R; Alici, A; Alkin, A; Almaraz, J R M; Alme, J; Alt, T; Altinpinar, S; Altsybeev, I; Alves Garcia Prado, C; Andrei, C; Andronic, A; Anguelov, V; Anielski, J; Antičić, T; Antinori, F; Antonioli, P
    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