Estimates of the isospin-violating Λb- Σ0φ;Σ0J=ψ decays and the Σ - Λ mixing

被引：2

作者：

Rui, Zhou ^{[1
]}

Li, Jia-Ming ^{[1
]}

Zhang, Chao-Qi ^{[1
]}

机构：

[1] North China Univ Sci & Technol, Coll Sci, Tangshan 063009, Peoples R China

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 03期

基金：

中国国家自然科学基金;

关键词：

TWIST DISTRIBUTION AMPLITUDES; ELECTROWEAK PENGUIN; WAVE-FUNCTIONS; QCD FACTORIZATION; VECTOR-MESONS; B-DECAY; BARYON; PI; ASYMMETRIES; PUZZLE;

D O I：

10.1103/PhysRevD.108.033004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze the two purely isospin-violating decays A(b) -E-0 phi and A(b) -E(0)J=psi, proceeding merely via the exchange topologies, in the framework of the perturbative QCD approach. Assuming E0 baryon belongs to the idealized isospin triplet with quark components of usd, the branching ratios of the two decay modes are predicted to be tiny, of the order 10(-8) - 10(-9), leading to difficulty in observing them. We then extend our study to include the Sigma - A mixing. It is found that the mixing has significant effect on the Ab -Sigma decays, especially it can greatly increase the rate of the J=psi process, by as much as two orders of magnitude, yield 10-7, which should be searchable in the future. We also estimate a set of asymmetry observables with and without the mixing effect, which will be tested in coming experiments.

引用

页数：23

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