Hadronic charmless B decays B-> AP
| dc.creator | Cheng, Hai-Yang | |
| dc.creator | Yang, Kwei-Chou | |
| dc.date | 2007-09-03 | |
| dc.date | 2007-11-18 | |
| dc.date.accessioned | 2026-07-07T11:42:09Z | |
| dc.date.available | 2026-07-07T11:42:09Z | |
| dc.description | The two-body hadronic decays of B mesons into pseudoscalar and axial vector mesons are studied within the framework of QCD factorization. The light-cone distribution amplitudes (LCDAs) for $^3P_1$ and $^1P_1$ axial-vector mesons have been evaluated using the QCD sum rule method. Owing to the G-parity, the chiral-even two-parton light-cone distribution amplitudes of the $^3P_1$ ($^1P_1$) mesons are symmetric (antisymmetric) under the exchange of quark and anti-quark momentum fractions in the SU(3) limit. For chiral-odd LCDAs, it is other way around. The main results are the following: (i) The predicted rates for $a_1^\pm(1260)π^\mp$, $b_1^\pm(1235)π^\mp$, $b_1^0(1235)π^-$, $a_1^+K^-$ and $b_1^+K^-$ modes are in good agreement with the data. However, the naively expected ratios $Br(B^-\to a_1^0π^-)/Br(\ov B^0\to a_1^+π^-)\leq 1$, $Br(B^-\to a_1^-π^0)/Br(\ov B^0\to a_1^-π^+)\sim {1\over 2}$ and $Br(B^-\to b_1^0K^-)/Br(\ov B^0\to b_1^+K^-)\sim {1\over 2}$ are not borne out by experiment. This should be clarified by the improved measurements of these decays. (ii) Since the $\bar B\to b_1K$ decays receive sizable annihilation contributions, their rates are sensitive to the interference between penguin and annihilation terms. The measurement of $Br(\bar B^0\to b_1^+K^-)$ implies a destructive interference which in turn indicates that the form factors for $B\to b_1$ and $B\to a_1$ transitions are of opposite signs. (iii) Sizable power corrections such as weak annihilation are needed to account for the observed rates of the penguin-dominated modes $K_1^-(1270)π^+$ and $K_1^-(1400)π^+$. | |
| dc.description | 38 pages, 1 figure. The experimental limit in Fig.1 is updated | |
| dc.identifier | https://arxiv.org/abs/0709.0137 | |
| dc.identifier | http://arxiv.org/abs/0709.0137 | |
| dc.identifier | Phys.Rev.D76:114020,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.114020 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/200785 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Hadronic charmless B decays B-> AP | |
| dc.type | text |