What can we learn from $B\to a_1(1260)(b_1(1235))π(K)$ decays?

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dc.creatorWang, Wei
dc.creatorLi, Run-Hui
dc.creatorLü, Cai-Dian
dc.date2008-06-16
dc.date.accessioned2026-07-07T11:51:42Z
dc.date.available2026-07-07T11:51:42Z
dc.descriptionWe investigate the $B\to a_1(1260)(b_1(1235))π(K)$ decays under the factorization scheme and find many discrepancies between theoretical predictions and the experimental data. In the tree dominated processes, large contributions from color-suppressed tree diagrams are required in order to accommodate with the large decay rates of $B^-\to a_1^0π^-$ and $B^-\to a_1^-π^0$. For $\bar B^0\to (a_1^+, b_1^+)K^-$ decays which are both induced by $b\to s$ transition, theoretical predictions on their decay rates are larger than the data by a factor of 2.8 and 5.5, respectively. Large electro-weak penguins or some new mechanism are expected to explain the branching ratios of $B^-\to b_1^0K^-$ and $B^-\to a_1^-\bar K^0$. The soft-collinear-effective-theory has the potential to explain large decay rates of $B^-\to a_1^0π^-$ and $B^-\to a_1^-π^0$ via a large hard-scattering form factor $ζ_J^{B\to a_1}$. We will also show that, with proper charming penguins, predictions on the branching ratios of $\bar B^0\to (a_1^+, b_1^+)K^-$ can also be consistent with the data.
dc.description16 pages, no figure
dc.identifierhttps://arxiv.org/abs/0806.2510
dc.identifierhttp://arxiv.org/abs/0806.2510
dc.identifierPhys.Rev.D78:074009,2008
dc.identifierdoi:10.1103/PhysRevD.78.074009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203987
dc.subjectHigh Energy Physics - Phenomenology
dc.titleWhat can we learn from $B\to a_1(1260)(b_1(1235))π(K)$ decays?
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