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Author(s)
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Abreu, M C ; Astruc, J ; Baglin, C ; Baldit, C ; Bedjidian, M ; Bordalo, P ; Borges, G ; Bussière, A ; Castor, J ; Chaurand, B ; Chevrot, I ; Cheynis, B ; Devaux, A ; Drapier, O ; Espagnon, B ; Fargeix, J ; Ferreira, R ; Force, P ; Gerschel, C ; Grossiord, J Y ; Guichard, A ; Guimarães, J ; Haroutunian, R ; Jouan, D ; Kluberg, L ; Lourenço, C ; Mourgues, S ; Petiau, P ; Pizzi, J R ; Quintans, C ; Ramos, S ; Romana, A ; Santos, H ; Saturnini, P ; Shahoyan, R ; Sonderegger, P ; Tarrago, X |
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Abstract
| The production of rho omega and phi vector-mesons, detected through their mumu 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/sub mumu/sigma/sub phi //(B/sub mumu/sigmaas a function of the transverse momentum, p/sub T /, and of the collision centrality. While this ratio exhibits no significant dependence with p/sub T/, it clearly increases with the centrality of the collision. Effective temperatures deduced from the transverse mass spectra, dsigma/dM/sub T/, lead to values of Trho +omega equal or slightly higher than T/sub phi/. Both these effective temperatures smoothly increase from p-W to S-U reactions. |