2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

A new way to search for right-handed currents in semileptonic $B \to \rho \ell \bar\nu$ decay

5 Jul 2014, 13:00
Sala 3+4 ()

Sala 3+4

Oral presentation Flavour Physics Flavour Physics


Mr. Sascha Turczyk (University of Mainz)


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 $\sim 3\sigma$. 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 $b\rightarrow u$ 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 $\rho$ mesons. 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 $50\,{\rm ab}^{-1}$ at Belle~II.

Primary authors

Mr. Florian Bernlochner (Humboldt University Berlin) Mr. Sascha Turczyk (University of Mainz) Mr. Zoltan Ligeti (Lawrence Berkeley National Laboratory)

Presentation Materials


Your browser is out of date!

Update your browser to view this website correctly. Update my browser now