Nonleptonic two-body decays of single heavy baryons ΛQ, ΞQ, and ΩQ (Q =b, c) induced by W emission in the covariant confined quark model

被引：48
作者：
Gutsche, Thomas [1 ]
Ivanov, Mikhail A. [2 ]
Koerner, Juergen G. [3 ]
Lyubovitskij, Valery E. [1 ,4 ,5 ,6 ,7 ]
机构：
[1] Univ Tubingen, Kepler Ctr Astro & Particle Phys, Inst Theoret Phys, Morgenstelle 14, D-72076 Tubingen, Germany
[2] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
[3] Johannes Gutenberg Univ Mainz, Inst Phys, PRISMA Cluster Excellence, D-55099 Mainz, Germany
[4] Univ Tecn Feder Santa Maria, Dept Fis, Casilla 110-V, Valparaiso, Chile
[5] Univ Tecn Feder Santa Maria, Ctr Cient Tecnol Valparaiso CCTVal, Casilla 110-V, Valparaiso, Chile
[6] Tomsk State Univ, Dept Phys, Tomsk 634050, Russia
[7] Tomsk State Univ, Lab Particle Phys, Tomsk 634050, Russia
来源：
PHYSICAL REVIEW D | 2018年 / 98卷 / 07期
关键词：
WEAK DECAYS; POLARIZATION; TRANSITIONS; BOTTOM; J/PSI; RULE;
D O I：
10.1103/PhysRevD.98.074011
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have made a survey of heavy-to-heavy and heavy-to-light nonleptonic heavy baryon two-body decays and have identified those decays that proceed solely via W-boson emission, i.e., via the tree graph contribution. Some sample decays are Omega(-)(b)-> Omega(c)(*)(0 )rho(-)(pi(-)), Omega(-)(b) -> Omega(-) J/psi(eta(c)), Xi(0,-)(b) -> Xi(0,- )J/ psi(eta(c)) Lambda(b) -> Lambda J/psi(eta(c)), Lambda(b) -> Lambda D-c(s)(*), Omega(0)(c) -> Omega(-) rho(+)(pi(+)), and Lambda(c )-> p phi. We make use of the covariant confined quark model previously developed by us to calculate the tree graph contributions to these decays. We calculate rates, branching fractions and, for some of these decays, decay asymmetry parameters. We compare our results to experimental findings and the results of other theoretical approaches when they are available. Our main focus is on decays to final states with a lepton pair because of their clean experimental signature. For these decays we discuss two-fold polar angle decay distributions such as in the cascade decay Omega(-)(b) -> Omega(-)(-> Xi pi, Lambda K-) + J/psi(-> l(+)l(-)). Lepton mass effects are always included in our analysis.
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页数：19
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