Polarized $Λ_b\to Λ_c l \barν$ decay in perturbative QCD
| dc.creator | Shih, Hsien-Hung | |
| dc.creator | Lee, Shih-Chang | |
| dc.creator | Li, Hsiang-nan | |
| dc.date | 1999-08-13 | |
| dc.date | 2000-06-03 | |
| dc.date.accessioned | 2026-07-07T04:07:49Z | |
| dc.date.available | 2026-07-07T04:07:49Z | |
| dc.description | We study the polarized $Λ_b$ baryon semileptonic decay $Λ_b \to Λ_cl{\barν}$ using perturbative QCD factorization theorem. In this approach heavy baryon transition form factors are expressed as the convolutions of hard $b$ quark decay amplitudes with universal $Λ_b$ and $Λ_c$ baryon wave functions. With the heavy baryon wave functions determined in our previous work, we predict the asymmetry parameter $α({\hat e})\equiv (N_+-N_-)/(N_++N_-)=-0.31 {\bf P}\cdot{\hat e}$, where ${\bf P}$ is the $Λ_b$ baryon polarization, ${\hat e}$ a unit vector perpendicular to the $Λ_b$ baryon momentum, $N_+$ ($N_-$) the number of leptons whose momenta possess positive (negative) components along ${\hat e}$. This result is useful for extracting the transverse polarization of a $Λ_b$ baryon from data of exclusive semileptonic decays. | |
| dc.description | 9 pages in Latex file, some comments and one table added | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9908346 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9908346 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/49290 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Polarized $Λ_b\to Λ_c l \barν$ decay in perturbative QCD | |
| dc.type | text |