Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 19: Flavourphysik (Theorie)
T 19.5: Vortrag
Montag, 27. März 2017, 17:45–18:00, VSH 06
Exclusive B(s) → π (K) ℓ+ ℓ− decays at large recoil and CKM matrix elements — Alexander Khodjamirian and •Aleksey Rusov — Universität Siegen
We propose a way to determine the Wolfenstein parameters A,ρ,η of the CKM matrix from the observables in semileptonic exclusive FCNC decays, combining the branching fractions and direct CP-asymmetry of B → π ℓ+ ℓ− decays with the branching fraction of B → K ℓ+ ℓ− processes. To this end, we calculate the required hadronic input involved in the binned observables in the large recoil region, taking into account, in addition to the form factors, the nonlocal hadronic matrix elements. The latter are obtained combining QCD factorization and light-cone sum rules (LCSR) with hadronic dispersion relations. For form factors we use revisited LCSR results taking also the recent estimate of the higher twist effects into account. Moreover, we calculate the hadronic input for a yet unexplored channel Bs → K0 ℓ+ ℓ−.