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arXiv 2408.15364hep-phhep-exnucl-exnucl-th
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基于输运方法的质子-原子核反应中 $ϕ$ 介子的产生与介质内修改

Production and in-medium modification of $ϕ$ mesons in proton-nucleus reactions from a transport approach

Philipp Gubler, Masaya Ichikawa, Taesoo Song, Elena Bratkovskaya

AI总结:

本文基于 PHSD 输运方法研究了 12 GeV/c 质子-原子核反应中 $ϕ$ 介子的产生与介质内修改,发现即使在低于正常核物质密度的条件下,不同介质内修改场景仍会使双轻子谱产生显著变化。

摘要:

本文研究了在 12 GeV/c 的质子-原子核反应(p+C、p+Cu 和 p+Pb)中隐奇异 $ϕ$ 介子的产生与介质内修改,这些反应部分由 KEK E325 合作组通过双轻子衰变模式测量。本研究基于非质壳微观 Parton-Hadron-String Dynamics (PHSD) 输运方法,该方法提供了致密物质中强相互作用强子和部分子自由度的动力学描述,特别使得模拟所研究反应中 $ϕ$ 介子的介质内非质壳动力学成为可能。研究了核物质中 $ϕ$ 介子谱函数修改的不同介质内场景:i) 极点质量下降,ii) 碰撞展宽,iii) 极点质量下降与碰撞展宽同时发生。尽管 p+A 反应中的 $ϕ$ 介子产生仅发生在正常核物质密度 $ρ_0$ 附近或低于该密度的条件下,我们发现与真空分布相比,介质内场景下生成的双轻子谱存在可见的修改。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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