2010/12/31 by Run-Hui Li, Cai-Dian Lü, Wei Wang · 43 citations
Physics and Astronomy · #Amplitude #Asymmetry #Branching fraction #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1103/physrevd.83.034034
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 83(3) (American Physical Society) · 21 pages, 9 figures, accepted for publication in Phys. Rev. D
arxiv created 2011/01/24 · openalex publication_date 2011/02/25 · arxiv updated 2015/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We analyze the B\ensuremath→K2*(\ensuremath→K\ensuremathπ)l+l^\ensuremath- (with l=e, \ensuremathμ, \ensuremathτ) decay in the standard model and two new physics scenarios: the vectorlike quark model and family nonuniversal Z^\ensuremath' models. We derive the differential angular distributions using the recently calculated form factors in the perturbative QCD approach. Branching ratios, polarizations, forward-backward asymmetries, and transversity amplitudes are predicted, from which we find a promising prospective to observe this channel in future experiments. We update the constraints on effective Wilson coefficients and/or free parameters in these two new physics scenarios by making use of the B\ensuremath→K*l+l^\ensuremath- and b\ensuremath→sl+l^\ensuremath- experimental data. Their impact on B\ensuremath→K2*l+l^\ensuremath- is subsequently explored and, in particular, the zero-crossing point for the forward-backward asymmetry in these new physics scenarios can sizably deviate from the standard model. In addition we also generalize the analysis to a similar mode, Bs\ensuremath→f2^\ensuremath'(1525)(\ensuremath→K+K^\ensuremath-)l+l^\ensuremath-.