Speaker
Description
We study the $\phi$ meson production in heavy-ion collisions from
subthreshold energies of 1.23 A GeV up to RHIC energies within the
microscopic Parton-Hadron-String Dynamics (PHSD) transport approach where
the novel production channels of $\phi$ meson based on the coupled channel
$T$-matrix approach are implemented along with the collisional broadening
of $\phi$-meson spectral width in medium.
Since $\phi$ meson production is closely related to the production of kaon
and antikaon, antikaon properties are described via the self-consistent
coupled-channel unitarized scheme within a SU(3) chiral Lagrangian
($G$-matrix) which incorporates explicitly the $s-$ and
$p-$ waves of the kaon-nucleon interaction, and the in-medium modification
of kaons are accounted via the kaon-nuclear potential, which is assumed to
be proportional to the local baryon density.
The medium effects on the $\phi$ production is investigated by comparing
with the experimental data from the FOPI, HADES and STAR Collaborations.
The new production channels of $\phi$ meson as
well as the broadening of the width in medium enhances the $\phi$
production near threshold energies and we find agreement with data without
invoking unknown resonance decays, as done in alternative approaches.
| Present via | Online |
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