Left-right mixing on leptonic and semileptonic $b\to u$ decays

Abstract

It has been known that there exists a disagreement emerged between the determination of $|V_{ub}|$ from inclusive $B\to X_u\ell \nu$ decays and exclusive $B\to \pi \ell \nu$ decays. In order to solve the mismatch, we investigate the left-right (LR) mixing effects, denoted by ${\xi }_u$, in leptonic and semileptonic $b\to u$ decays. We find that the new interactions $(V+A)\times (V-A)$ induced via the LR mixing can explain the mismatch between the values of $|V_{ub}|$ if Re$({\xi }_u)=-(0.14\pm 0.12)$. Furthermore, we also find that the LR mixing effects can enhance the branching fractions for $B\to \tau \nu$ and $B\to \rho \ell \nu$ decays by 30% and 17%, respectively, while reducing the branching fraction for $B\to \gamma \ell \nu$ decays by 18%.

11 pages, 6 eps figures

References in corpus (5)

• Hints of large tan(beta) in flavour physics
• Light-cone sum rules for $B\to \pi$ form factors revisited
• Inclusive semileptonic B decays and the determination of |V_ub|
• Charged Higgs on $B^{-}\to \tau {\bar{\nu }}_{\tau }$ and $\bar{B}\to P(V)\ell {\bar{\nu }}_{\ell }$
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Cited by in corpus (8)

• Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be explained by New Physics?
• New ways to search for right-handed current in B -> rho ell nu decay
• The Higgs Mass, Superconnections and the TeV-scale Left-Right Symmetric Model
• Flavor Physics in the LHC era: the role of the lattice
• Right-handed current with $CP$ violation in the $b\to u$ transition
• Challenges for New Physics in the Flavour Sector
• $\frac{|V_{ub}|}{|V_{cb}|}$ and Quest for New Physics
• Flavour Theory and the LHC Era