Light vector meson production in pp collisions at

Physics Letters B, 2012

The ALICE experiment has measured low-mass dimuon production in pp collisions at √ 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 (η, ρ, ω, η ′ , φ ) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for ω and φ are σ ω (1 < p t < 5 GeV/c, 2.5 < y < 4) = 5.28 ± 0.54(stat) ± 0.50(syst) mb and σ φ (1 < p t < 5 GeV/c, 2.5 < y < 4) = 0.940 ± 0.084(stat) ± 0.078(syst) mb. The differential cross sections d 2 σ /dydp t are extracted as a function of p t for ω and φ . The ratio between the ρ and ω cross section is obtained. Results for the φ are compared with other measurements at the same energy and with predictions by models.

2011

The ALICE experiment has measured low-mass dimuon production in pp collisions at √ 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 (η, ρ, ω, η ′ , φ ) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for ω and φ are σ ω (1 < p t < 5 GeV/c, 2.5 < y < 4) = 5.28 ± 0.54(stat) ± 0.50(syst) mb and σ φ (1 < p t < 5 GeV/c, 2.5 < y < 4) = 0.940 ± 0.084(stat) ± 0.078(syst) mb. The differential cross sections d 2 σ /dydp t are extracted as a function of p t for ω and φ . The ratio between the ρ and ω cross section is obtained. Results for the φ are compared with other measurements at the same energy and with predictions by models.