Light vector meson production in pp collisions at $\sqrt{s}$ = 7 TeV

Abstract

The ALICE experiment has measured low-mass dimuon production in pp collisions at $\sqrt{s}=7$ TeV in the dimuon rapidity region 2.5<y<4. The observed dimuon mass spectrum is described as a superposition of resonance decays ($\eta$, $\rho$, $\omega$, ${\eta }^{{}^{\prime }}$, $\varphi$) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for $\omega$ and $\varphi$ are ${\sigma }_{\omega }$ (1<$p_{\mathrm{T}}$<5 GeV/$c$,2.5<y<4) = 5.28 $\pm$ 0.54 (stat) $\pm$ 0.50 (syst) mb and ${\sigma }_{\varphi }$(1<$p_{\mathrm{T}}$<5 GeV/$c$,2.5<y<4)=0.940 $\pm$ 0.084 (stat) $\pm$ 0.078 (syst) mb. The differential cross sections $d^2\sigma /dyd{p}_{\mathrm{T}}$ are extracted as a function of $p_{\mathrm{T}}$ for $\omega$ and $\varphi$. The ratio between the $\rho$ and $\omega$ cross section is obtained. Results for the $\varphi$ are compared with other measurements at the same energy and with predictions by models.

18 pages, 6 captioned figures, 2 tables, authors from page 13, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3508

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