https://doi.org/10.1140/epjc/s10052-017-4980-9
Regular Article - Theoretical Physics
Study of the weak annihilation contributions in charmless decays
1
Institute of Particle and Nuclear Physics, Henan Normal University, Henan, 453007, China
2
Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan, 430079, Hubei, China
* e-mail: xqli@itp.ac.cn
Received:
23
March
2017
Accepted:
8
June
2017
Published online:
20
June
2017
In this paper, in order to probe the spectator-scattering and weak annihilation contributions in charmless (where V stands for a light vector meson) decays, we perform the -analyses for the endpoint parameters within the QCD factorization framework, under the constraints from the measured , , and decays. The fitted results indicate that the endpoint parameters in the factorizable and nonfactorizable annihilation topologies are non-universal, which is also favored by the charmless and PV (where P stands for a light pseudo-scalar meson) decays observed in previous work. Moreover, the abnormal polarization fractions measured by the LHCb collaboration can be reconciled through the weak annihilation corrections. However, the branching ratio of decay exhibits a tension between the data and theoretical result, which dominates the contributions to in the fits. Using the fitted endpoint parameters, we update the theoretical results for the charmless decays, which will be further tested by the LHCb and Belle-II experiments in the near future.
© The Author(s), 2017