Production and in-medium modification of $ϕ$ mesons in proton-nucleus reactions from a transport approach
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913483209048064 |
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| author | Gubler, Philipp Ichikawa, Masaya Song, Taesoo Bratkovskaya, Elena |
| author_facet | Gubler, Philipp Ichikawa, Masaya Song, Taesoo Bratkovskaya, Elena |
| contents | Production and in-medium modification of hidden strange $ϕ$ mesons are studied in proton-nucleus reactions - p+C, p+Cu and p+Pb - at 12 GeV/c, partially measured by the KEK E325 collaboration via the dilepton decay mode. This work is based on the off-shell microscopic Parton-Hadron-String Dynamics (PHSD) transport approach, which provides the dynamical description of strongly interacting hadronic and partonic degrees of freedom in dense matter, and especially makes it possible to simulate in-medium off-shell dynamics of the $ϕ$ meson in the reactions studied. Different in-medium scenarios for the modification of the $ϕ$ meson spectral function in nuclear matter are investigated: i) dropping pole mass, ii) collisional broadening and iii) simultaneous dropping pole mass and collisional broadening. Even though the $ϕ$ meson production in p+A reactions occurs only at densities around or below normal nuclear matter density $ρ_0$, we find visible modifications of the generated dilepton spectra for the in-medium scenarios compared to the vacuum distribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15364 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Production and in-medium modification of $ϕ$ mesons in proton-nucleus reactions from a transport approach Gubler, Philipp Ichikawa, Masaya Song, Taesoo Bratkovskaya, Elena High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory Production and in-medium modification of hidden strange $ϕ$ mesons are studied in proton-nucleus reactions - p+C, p+Cu and p+Pb - at 12 GeV/c, partially measured by the KEK E325 collaboration via the dilepton decay mode. This work is based on the off-shell microscopic Parton-Hadron-String Dynamics (PHSD) transport approach, which provides the dynamical description of strongly interacting hadronic and partonic degrees of freedom in dense matter, and especially makes it possible to simulate in-medium off-shell dynamics of the $ϕ$ meson in the reactions studied. Different in-medium scenarios for the modification of the $ϕ$ meson spectral function in nuclear matter are investigated: i) dropping pole mass, ii) collisional broadening and iii) simultaneous dropping pole mass and collisional broadening. Even though the $ϕ$ meson production in p+A reactions occurs only at densities around or below normal nuclear matter density $ρ_0$, we find visible modifications of the generated dilepton spectra for the in-medium scenarios compared to the vacuum distribution. |
| title | Production and in-medium modification of $ϕ$ mesons in proton-nucleus reactions from a transport approach |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2408.15364 |