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T: Fachverband Teilchenphysik
T 104: Flavor VIII
T 104.3: Talk
Thursday, March 23, 2023, 16:20–16:35, HSZ/0304
Studies of B → D** ℓ ν at Belle II — Gerald Eigen1,2, Ariane Frey2, and •Noreen Rauls2 — 1Institutt for fysikk og teknologi, Bergen, Norway — 2II. Physikalisches Institut, Georg-August-Universität Göttingen, Deutschland
To probe the Standard Model, various different measurements can be conducted. One test that can be performed is the determination of the ratio R(D(*))= B(B → D(*) τ ν)/B(B → D(*) ℓ ν) , where one limiting factor is the background arising from semileptonic B → D** ℓ ν decays. Therefore, this analysis attempts to acquire a better understanding of the decay B → D** ℓ ν as well as measure its branching ratio.
This measurement is based on data collected at the Belle II experiment, which is situated at the asymmetric e+ e− collider SuperKEKB in Japan, which operates at the Υ(4S) resonance. Thus, the B mesons are always produced in pairs. One of these B mesons is reconstructed employing the hadronic Full Event Interpretation (FEI), which reconstructs exclusive hadronic B decays. To reconstruct the other B meson, a charged, light lepton is combined with a D**, where multiple hadronic decay modes are considered.
This talk will outline the selection procedure as well as explain a binned maximum likelihood fit to extract the branching ratio. Besides, a brief outlook on future plans will be given.