$\varphi$ Production in In-In Collisions at 158 AGeV

Abstract

The NA60 experiment has measured muon pair production in In-In collisions at 158 AGeV at the CERN SPS. This paper presents a high statistics measurement of $\varphi \to \mu \mu$ meson production. Differential spectra, yields, mass and width are measured as a function of centrality and compared to previous measurements in other colliding systems at the same energy. The width of the rapidity distribution is found to be constant as a function of centrality, compatible with previous results. The decay muon polar angle distribution is measured in several reference frames. No evidence of polarization is found as a function of transverse momentum and centrality. The analysis of the $p_T$ spectra shows that the $\varphi$ has a small radial flow, implying a weak coupling to the medium. The $T_{eff}$ parameter measured in In-In collisions suggests that the high value observed in Pb-Pb in the kaon channel is difficult to reconcile with radial flow alone. The absolute yield is compared to results in Pb-Pb collisions: though significantly smaller than measured by NA50 in the muon channel, it is found to exceed the NA49 and CERES data in the kaon channel at any centrality. The mass and width are found to be compatible with the PDG values at any centrality and at any $p_T$: no evidence for in-medium modifications is observed.

18 pages, 18 figures, accepted for publication in EPJ C

References in corpus (24)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Thermal phenomenology of hadrons from 200 AGeV S+S collisions
• Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC and LHC
• Evidence for in-medium modification of the $\varphi$ meson at normal nuclear density
• Dilepton Radiation at the CERN Super Proton Synchrotron
• Evidence for the production of thermal muon pairs with masses above 1 GeV/c^2 in 158A GeV Indium-Indium Collisions
• Phi decay in nuclei
• Abundant phi-Meson Production in pbar-p Annihilation at Rest and Strangeness in the Nucleon
• Phi meson mass and decay width in nuclear matter
• Energy and system size dependence of ϕmeson production in Cu+Cu and Au+Au collisions
• Evidence for radial flow of thermal dileptons in high-energy nuclear collisions
• Strangeness production from SPS to LHC
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Phi meson production in relativistic heavy ion collisions
• System-size dependence of strangeness production in nucleus-nucleus collisions at sqrt{s_{NN}}=17.3 GeV
• Rescattering of Vector Meson Daughters in High Energy Heavy Ion Collisions
• Leptonic and charged kaon decay modes of the $\varphi$ meson measured in heavy-ion collisions at the CERN SPS
• What have we learned and want to learn from heavy ion collisions at CERN SPS?
• Thermal dileptons at SPS energies
• First results on angular distributions of thermal dileptons in nuclear collisions
• Short-Lived Phi Mesons
• Medium effects on phi decays to dilepton and kaon-antikaon pairs in relativistic heavy ion reactions

Cited by in corpus (27)

• Hadron properties in the nuclear medium
• Production of K${}^{\ast }$(892)${}^0$ and $\varphi$(1020) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Dielectron production in Ar+KCl collisions at 1.76A GeV
• Strangeness in the cores of neutron stars
• Light vector meson production in pp collisions at $\sqrt{s}$ = 7 TeV
• Measurements of Ks, Lambda and Xi from Au+Au collisions at \sqrt{s_NN} = 7.7, 11.5 and 39 GeV in STAR
• D meson nuclear modification factors in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV measured with the ALICE detector at the CERN-LHC
• $\varphi$-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
• Electromagnetic Probes
• Search for the QCD Critical Point by Higher Moments of Net-proton Multiplicity Distributions at RHIC
• A comparative measurement of $\varphi \to K^{+}{K}^{-}$ and $\varphi \to {\mu }^{+}{\mu }^{-}$ in In-In collisions at the CERN SPS
• Open heavy flavor at RHIC and LHC in a partonic transport model
• $\varphi$ meson production at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Analysis of spectral modification of $\varphi$ mesons at finite density using a transport approach in the 12 GeV pA reactions
• Probe the QCD phase diagram with phi-meson production in relativistic nuclear collisions at STAR
• Phi meson production in In-In collisions at $E_{\mathrm{lab}}$=158$A$ GeV: evidence for relics of a thermal phase
• Leptonic decay of $\varphi$(1020) meson measured with the STAR experiment
• Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60
• Catalytic Reactions in Heavy-ion Collisions
• The QCD Critical End Point in the Context of the Polyakov--Nambu--Jona-Lasinio Model
• NA60 results on phi production in the hadronic and leptonic channels in In-In collisions at 158 GeV
• Production of multi-strange baryons in 7 TeV proton-proton collisions with ALICE
• Strangeness production in hadronic models and recombination models
• Dileptons, Charm and Charmonium at Finite Temperature and Chemical Potential
• Exclusive open strangeness production in the $pp\to pp{K}^{+}{K}^{-}$ reaction at high energies and a measurement of scalar ${\chi }_{c0}$ meson
• Energy dependence of elliptic flow of $\varphi$-meson in STAR at RHIC
• Dileptons and Direct Photons at SPS