Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 119: Flavour (Theorie/Experiment) 3

T 119.7: Talk

Thursday, March 27, 2014, 18:15–18:30, GFH 01-701

A new way to search for right-handed currents in semileptonic B → ρ ℓ ν decay — Florian Bernlochner¹, Zoltan Ligeti², and •Sascha Turczyk³ — ¹University of Victoria, Victoria, British Columbia, Canada V8W 3P — ²Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720 — ³PRISMA Cluster of Excellence & Mainz Institut for Theoretical Physics Johannes Gutenberg University, D-55099 Mainz, Germany

There exist a long standing tension among different determinations of the CKM matrix element |V_ub| from miscellaneous (semi)leptonic B decay channels with varying significance of up to ∼ 3σ. An interesting possibility to ease this tension is to allow for a right-handed contribution to the standard model left-handed weak current mediating the b→ u quark decay. The current bounds on such a contribution are fairly weak. We propose a new way to search for such a right-handed current in semileptonic B meson decay to ρ mesons. We describe a new variable that we propose, discuss the theoretical uncertainties, and study the achievable sensitivity both from the available Babar and Belle data sets, as well as from an anticipated 50 ab⁻¹ at Belle II.