Charmless Exclusive Baryonic B Decays
| dc.creator | Cheng, Hai-Yang | |
| dc.creator | Yang, Kwei-Chou | |
| dc.date | 2001-12-18 | |
| dc.date | 2002-06-17 | |
| dc.date.accessioned | 2026-07-07T10:52:33Z | |
| dc.date.available | 2026-07-07T10:52:33Z | |
| dc.description | We present a systematical study of two-body and three-body charmless baryonic B decays. Branching ratios for two-body modes are in general very small, typically less than $10^{-6}$, except that $\B(B^-\to p \barΔ^{--})\sim 1\times 10^{-6}$. In general, $\bar B\to N\barΔ>\bar B\to N\bar N$ due to the large coupling constant for $Σ_b\to BΔ$. For three-body modes we focus on octet baryon final states. The leading three-dominated modes are $\bar B^0\to p\bar nπ^-(ρ^-), n\bar pπ^+(ρ^+)$ with a branching ratio of order $3\times 10^{-6}$ for $\bar B^0\to p\bar nπ^-$ and $8\times 10^{-6}$ for $\bar B^0\to p\bar nρ^-$. The penguin-dominated decays with strangeness in the meson, e.g., $B^-\to p\bar p K^{-(*)}$ and $\bar B^0\to p\bar n K^{-(*)}, n\bar n \bar K^{0(*)}$, have appreciable rates and the $N\bar N$ mass spectrum peaks at low mass. The penguin-dominated modes containing a strange baryon, e.g., $\bar B^0\to Σ^0\bar pπ^+, Σ^-\bar nπ^+$, have branching ratios of order $(1\sim 4)\times 10^{-6}$. In contrast, the decay rate of $\bar B^0\toΛ\bar pπ^+$ is smaller. We explain why some of charmless three-body final states in which baryon-antibaryon pair production is accompanied by a meson have a larger rate than their two-body counterparts: either the pole diagrams for the former have an anti-triplet bottom baryon intermediate state, which has a large coupling to the $B$ meson and the nucleon, or they are dominated by the factorizable external $W$-emission process. | |
| dc.description | 46 pages and 3 figures, to appear in Phys. Rev. D. Major changes are: (i) Calculations of two-body baryonic B decays involving a Delta resonance are modified, and (ii) Penguin-dominated modes B-> Sigma+N(bar)+p are discussed | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0112245 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0112245 | |
| dc.identifier | Phys.Rev.D66:014020,2002 | |
| dc.identifier | doi:10.1103/PhysRevD.66.014020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/185192 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Charmless Exclusive Baryonic B Decays | |
| dc.type | text |