重子衰变的 CP 违约与 N π 反散射* * 部分受国家自然科学基金(12335003)和中央高校基本科研业务费(lzujbky-2024-oy02、lzujbky-2023-it12)资助

IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR
Jian-Peng Wang, Fu-Sheng Yu
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引用次数: 0

摘要

一个长期存在的难题是,重子系统中的CP违背(CPV)从未在实验中得到很好的证实,而介子的CPV却已经被观测了几十年。在本文中,我们提出重子衰变的 CPV 可以通过核子和先驱进入某些终态(即或)时的再散射产生。 得益于散射的丰富数据,我们可以利用散射的部分波幅来独立于模型地分析重子衰变的强相位。由于避免了最困难的非微扰动力学问题,我们可以在对衰变动力学有相对可靠理解的情况下预测重子衰变的 CPV。我们研究了 和 与 或 的过程,发现上述过程在散射不变质量区的全局 CPV 为百分之几的数量级。更重要的是,在达利茨图的某些区域,局部 CPV 可以达到 10%,甚至更大。考虑到预测结果和实验数据样本,我们强烈建议测量Ⅳ的CPV,这很有可能在重子系统中首次观测到CPV。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CP violation of baryon decays with N π rescatterings* * Supported in part by the Natural Science Foundation of China (12335003), and the Fundamental Research Funds for the Central Universities (lzujbky-2024-oy02, lzujbky-2023-it12)
There is a long-standing puzzle that the CP violation (CPV) in the baryon systems has never been well established in experiments, while the CPV of mesons have been observed by decades. In this paper, we propose that the CPV of baryon decays can be generated with the rescatterings of a nucleon and a pion into some final states, i.e. or . Benefited by the fruitful data of scatterings, we can model-independently analyse the strong phases of -baryon decays using the partial wave amplitudes of scatterings. Avoiding the most difficult problem of non-perturbative dynamics, it makes a great advantage to predict the CPV of baryon decays with a relatively reliable understanding of the decay dynamics. We study the processes of and with or . It is found that the global CPV of the above processes in the invariant mass regions of scatterings are at the order of several percent. More importantly, the local CPV in some regions of the Dalitz plots can reach the order of 10%, or be even larger. Considering the predicted results and the experimental data samples, we strong suggest to measure the CPV of , which has a large possibility to achieve the first observation of CPV in the baryon system.
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来源期刊
中国物理C
中国物理C 物理-物理:核物理
CiteScore
6.50
自引率
8.30%
发文量
8976
审稿时长
1.3 months
期刊介绍: Chinese Physics C covers the latest developments and achievements in the theory, experiment and applications of: Particle physics; Nuclear physics; Particle and nuclear astrophysics; Cosmology; Accelerator physics. The journal publishes original research papers, letters and reviews. The Letters section covers short reports on the latest important scientific results, published as quickly as possible. Such breakthrough research articles are a high priority for publication. The Editorial Board is composed of about fifty distinguished physicists, who are responsible for the review of submitted papers and who ensure the scientific quality of the journal. The journal has been awarded the Chinese Academy of Sciences ‘Excellent Journal’ award multiple times, and is recognized as one of China''s top one hundred key scientific periodicals by the General Administration of News and Publications.
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