Squeezing effect on D+∕D− with nonzero chemical potential

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Modern Physics Letters A Pub Date : 2024-04-09 DOI:10.1142/s0217732324500421
Hong-Jie Yin, Jia-Hui Feng, Yong Zhang
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Abstract

The medium mass modification may lead to a squeezing effect. In the baryonic medium, the mass of D meson was expected to reduce and the in-medium masses of D+ and D may show a splitting effect, and the chemical potential of D meson may be not zero. We study the squeezing effect on the yield ratio D+D with nonzero chemical potential. Due to the in-medium mass splitting, the squeezing effect on the momentum distributions of D+ and D are different. Without the squeezing effect, the yield ratio D+D remains constant as the transverse momentum increases. The yield ratio D+D is affected by the squeezing effect, resulting in a dependence on transverse momentum. An increase in transverse momentum leads to a decrease in the yield ratio, especially when there is a high chemical potential. Additionally, the in-medium mass splitting amplifies this phenomenon. The yield ratio D+D with nonzero chemical potential approaches 1 when there is a large average in-medium mass reduction, which becomes more evident at higher transverse momentum. The study of the squeezing effect on the yield ratio D+D with nonzero chemical potential may be meaningful for the CBM and PANDA experiments of the FAIR project at GSI.

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非零化学势对 D+∕D- 的挤压效应
介质质量的改变可能会导致挤压效应。在重子介质中,D介子的质量预计会减小,D+和D-的介质质量可能会出现分裂效应,D介子的化学势可能不为零。我们研究了非零化学势对 D+∕D-产率的挤压效应。由于中间质量分裂,挤压效应对 D+ 和 D- 的动量分布的影响是不同的。在没有挤压效应的情况下,随着横向动量的增加,屈服比 D+∕D- 保持不变。屈服比 D+∕D- 受到挤压效应的影响,从而与横动量有关。横动量的增加会导致屈服比的降低,尤其是在化学势较高的情况下。此外,中间质量分裂也会放大这一现象。当中间平均质量减少较大时,非零化学势的屈服比 D+∕D- 接近 1,这在横动量较大时更为明显。对化学势为非零的屈服比 D+∕D- 的挤压效应的研究可能对 GSI FAIR 项目的 CBM 和 PANDA 实验很有意义。
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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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