The production of , and vector-mesons by protons and sulphur ions with incident momentum of 200 GeV/c per nucleon

doi:10.1140/epjc/s2005-02368-8

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2005) 44: 375-382
https://doi.org/10.1140/epjc/s2005-02368-8

Experimental Physics

The production of $\rho$ , $\omega$ and $\phi$ vector-mesons by protons and sulphur ions with incident momentum of 200 GeV/c per nucleon

The NA38 Collaboration

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, p _T, and of the collision centrality. While this ratio exhibits no significant dependence with p _T, 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.