Doubly Charmful Baryonic B Decays
| dc.creator | Cheng, Hai-Yang | |
| dc.creator | Chua, Chun-Khiang | |
| dc.creator | Tsai, Shang-Yuu | |
| dc.date | 2005-12-27 | |
| dc.date | 2006-04-07 | |
| dc.date.accessioned | 2026-07-07T10:44:34Z | |
| dc.date.available | 2026-07-07T10:44:34Z | |
| dc.description | There are two apparent puzzles connected with the two-body and three-body doubly charmed baryonic B decays. First, earlier calculations based on QCD sum rules or the diquark model predict $Br(\bar B^0\toΞ_c^+\barΛ_c^-)\approx Br(\bar B^0\to\B_c\bar N)$, while experimentally the former has a rate two orders of magnitude larger than the latter. Second, a naive estimate of the branching ratio $10^{-9}$ for the color-suppressed three-body decay $\bar B\toΛ_c^+\barΛ_c^-K$, which is highly suppressed by phase space, is too small by five to six orders of magnitude compared to experiment. We show that the great suppression for the $Λ_c^+\barΛ_c^-K$ production can be alleviated provided that there exists a narrow hidden charm bound state with a mass near the $Λ_c\barΛ_c$ threshold. This new state that couples strongly to the charmed baryon pair can be searched for in B decays and in $p\bar p$ collisions by studying the mass spectrum of $D^{(*)}\bar D^{(*)}$ or $Λ_c\barΛ_c$. The doubly charmful decay $\bar B\toΞ_c\barΛ_c$ has a configuration more favorable than the singly charmful one such as $\bar B^0\toΛ_c\bar p$ since no hard gluon is needed to produce the energetic $Ξ_c\barΛ_c$ pair in the former decay, while two hard gluons are needed for the latter process. Assuming that a soft $q\bar q$ quark pair is produced through the $σ$ and $π$ meson exchanges in the configuration for $\bar B\to Ξ_c\barΛ_c$, it is found that its branching ratio is of order $10^{-3}$, in agreement with experiment. | |
| dc.description | 14 pages, 5 figures, to appear in Phys. Rev. D | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0512335 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0512335 | |
| dc.identifier | Phys.Rev.D73:074015,2006 | |
| dc.identifier | doi:10.1103/PhysRevD.73.074015 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/182636 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Doubly Charmful Baryonic B Decays | |
| dc.type | text |