Kalyan Dey, B. Bhattacharjee
In the study of heavy ion collision, $\phi$ meson is of special significance from the point of view that though it is a meson, at the same time has a mass comparable to baryons. Therefore a comparison of any parameter of $\phi$ with other baryons can help to differentiate between mass and particle species type dependence of particle production. The variation of width of the rapidity distribution on beam rapidity and the rapidity distribution of strangeness enhancement factor have been studied with UrQMD generated mesons and baryons at various FAIR energies to ascertain mass/species type behavior of $\phi$ meson. The width of the rapidity distribution is found to bear a power law with beam rapidity with a clear indication of violation of mass ordering at $\phi$ meson. Results on strangeness enhancement factor $E_S$ of various strange particles also reveals a similar mass ordering violation at $\phi$ meson indicating particle nature of $\phi$ meson.
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http://arxiv.org/abs/1303.7347
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