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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 mesondoi:10.1016/j.nuclphysbps.2015.09.207 fatcat:z4xumkxanjek3bqwhtuacyh6ba