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A new way to search for right-handed currents in semileptonic B→ρℓν‾ decay

Florian U. Bernlochner, Zoltan Ligeti, Sascha Turczyk
2016 Nuclear and Particle Physics Proceedings  
There exist a long standing tension among determinations of the CKM matrix element |V ub | from various (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. 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 → ρ meson
more » ... ic B → ρ meson decays. We describe a new variable that we propose, and discuss the theoretical uncertainties. Especially we investigate the uncertainties and their correlations among all contributing form factors with the assumed z-expansion for its shape, valid over the whole q 2 range. Then we 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.
doi:10.1016/j.nuclphysbps.2015.09.207 fatcat:z4xumkxanjek3bqwhtuacyh6ba