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A novel strategy for searching for CP violations in the baryon sector
Journal of High Energy Physics ( IF 5.4 ) Pub Date : 2021-07-23 , DOI: 10.1007/jhep07(2021)177
Zhen-Hua Zhang 1 , Xin-Heng Guo 2
Affiliation  

Despite the large baryon-anti-baryon asymmetry in the observable Universe, the closely related phenomenon — the violation of the combined charge and parity symmetry (CPV) — has not been observed in the baryon sector in laboratories. In this paper, a new strategy for searching for CPV in heavy hadron multi-body decays is proposed, in which a set of novel observables measuring CPV in such decays — the partial wave CP asymmetries (PWCP As) — are introduced. This strategy is model-independent and applicable to multi-body decays of heavy hadrons with arbitrary spin configurations in both initial and final states, and with any number of particles in the final state. It is especially applicable for CPV investigations in multi-body decays of heavy baryons. As applications of this strategy, we suggest to measure the PWCP As in some decay channels of bottom baryons such as \( {\Lambda}_b^0\to p{\pi}^{-}{\pi}^{+}{\pi}^{-} \), Λb → pKπ+π, \( {\Lambda}_b^0\to p{\pi}^{-}{K}^{+}{K}^{-} \), \( {\Lambda}_b^0\to \Lambda {K}^{+}{\pi}^{-} \), and \( {\Lambda}_b^0\to p{\pi}^{-}{K}_s \).

A preprint version of the article is available at ArXiv.


中文翻译:

一种在重子区寻找 CP 违规的新策略

尽管可观测宇宙中存在巨大的重子-反重子不对称性,但在实验室的重子扇区中尚未观察到这种密切相关的现象——违反联合电荷和奇偶对称性 ( CP V)。在本文中,提出了一种在重强子多体衰变中寻找CP V的新策略,其中介绍了一组在这种衰变中测量CP V的新可观测量——部分波CP不对称性(PW CP As)。该策略与模型无关,适用于在初始和最终状态具有任意自旋配置以及最终状态具有任意数量粒子的重强子的多体衰变。特别适用于CP重重子多体衰变中的 V 研究。作为该策略的应用,我们建议测量底部重子的一些衰变通道中的 PW CP As,例如\( {\Lambda}_b^0\to p{\pi}^{-}{\pi}^{+ }{\pi}^{-} \) , Λ b  →  pK π + π , \( {\Lambda}_b^0\to p{\pi}^{-}{K}^{+}{ K}^{-} \)\( {\Lambda}_b^0\to \Lambda {K}^{+}{\pi}^{-} \)\( {\Lambda}_b^0 \to p{\pi}^{-}{K}_s \)

该文章的预印版可在 ArXiv 上获得。
更新日期:2021-07-24
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