Angular analyses of exclusive (B)over-bar -%26gt; Xl(1)l(2) with complex helicity amplitudes

作者：Dey Biplab

来源：PHYSICAL REVIEW D, 2015, 92(3): 033013.

DOI：10.1103/PhysRevD.92.033013

We present the differential rates for exclusive (B) over bar -> Xl(1)l(2), where l(1) is a charged massless lepton and l(2) is a charged or neutral massless lepton and X is a mesonic system up to spin 2. The cases of interest are semileptonic (B) over bar -> X({c,u})l(-)(v) over bar (l) decays, and (B) over bar -> X(s)l(-)l(+) where the dilepton can be c (c) over bar resonances or nonresonant electroweak penguins. We consider helicity amplitudes having nonzero relative phases that can be potential new sources for CP violation. Our motivations for these additional phases include a complex right-handed admixture in the hadronic weak charged current for the semileptonic decays and complex Wilson coefficients in the effective Hamiltonians for the electroweak penguin decays. We demonstrate the efficacy of a novel technique of projecting out the individual angular moments in the full rate expression in a model-independent fashion. Our work is geared toward ongoing data analyses by BABAR and LHCb.

• 出版日期2015-8-26