1. The production of $\rho$ , $\omega$ and $\phi$ vector-mesons by protons and sulphur ions with incident momentum of 200 GeV/c per nucleon
- Author
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J. Castor, X. Tarrago, P. Bordalo, A. Romana, J.-R. Pizzi, Brigitte Cheynis, A. Baldit, A. Devaux, O. Drapier, B. Chaurand, R. Ferreira, G. Borges, M.C. Abreu, C. Gerschel, J. Astruc, Bruno Espagnon, Ruben Shahoyan, J. Guimaraes, Helena Santos, S. Ramos, C. Baglin, I. Chevrot, C. Quintans, R. Haroutunian, P. Force, Carlos Lourenco, L. Kluberg, J.-Y. Grossiord, M. Bedjidian, A. Bussiere, P. Saturnini, S. Mourgues, P. Petiau, P. Sonderegger, D. Jouan, A. Guichard, and J. Fargeix
- Subjects
Physics ,Particle physics ,Physics and Astronomy (miscellaneous) ,Meson ,010308 nuclear & particles physics ,Sigma ,01 natural sciences ,7. Clean energy ,Omega ,Spectral line ,Nuclear physics ,Momentum ,0103 physical sciences ,Transverse mass ,Production (computer science) ,Nuclear Experiment ,010306 general physics ,Nucleon ,Engineering (miscellaneous) - Abstract
The production of $\rho$ , $\omega$ and $\phi$ vector-mesons, detected through their $\mu\mu$ decay channel, is studied in p-W, S-S, S-Cu and S-U reactions at 200 GeV/c per nucleon incident momentum. Their inclusive cross-sections are determined in various transverse momentum intervals and their dependence on the projectile and target mass numbers is investigated. The relative yield $B_{\mu\mu}\sigma_{\phi}/(B_{\mu\mu}\sigma_{\rho} + B_{\mu\mu}\sigma_{\omega})$ is measured, both as a function of the transverse momentum, pT, and of the collision centrality. While this ratio exhibits no significant dependence with pT, it clearly increases with the centrality of the collision. Effective temperatures deduced from the transverse mass spectra, $d\sigma/dM_T$ , lead to values of $T_{\rho + \omega}$ equal or slightly higher than $T_{\phi}$ . Both these effective temperatures smoothly increase from p-W to S-U reactions.
- Published
- 2005
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