Limits on New Physics from exclusive $B\to D^{(\ast )}\ell \bar{\nu }$ Decays

Abstract

We consider the exclusive decays $B\to D^{(\ast )}\ell \bar{\nu }$ and study the effect of non $V-A$ structures on the observables. We extend the standard model hadronic current by additional right-handed vector as well as left- and right-handed scalar and tensor contributions and calculate the decay rates including the perturbative corrections up to order ${\alpha }_s$. Using the data of the exclusive semileptonic $b\to c$ decays and recent calculations of the form factors at the non-recoil point we discuss the constraints to the wrong helicity admixtures in the hadronic current.

7 pages

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Cited by in corpus (14)

• On the B to D* tau nu Sensitivity to New Physics
• The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model
• Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be explained by New Physics?
• Constraining new physics in $b\to c\ell \nu$ transitions
• New physics in $B$ meson mixing: future sensitivity and limitations
• Tension in the inclusive versus exclusive determinations of $|V_{cb}|$: a possible role of new physics
• New ways to search for right-handed current in B -> rho ell nu decay
• $B\to D\ell {\nu }_{\ell }$ form factors beyond leading power and extraction of $|V_{cb}|$ and $R(D)$
• R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications
• Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast )}\ell \overline{\nu }$ decay modes
• B-Meson Decays into Final States with a tau Lepton
• Physical observables in the decay ${\Lambda }_b\to {\Lambda }_c(\to \Lambda +\pi )+{\tau }^{-}+{\bar{\nu }}_{\tau }$
• $\frac{|V_{ub}|}{|V_{cb}|}$ and Quest for New Physics
• ${\eta }_c$ leading-twist distribution amplitude and the $B_c\to {\eta }_c\ell {\bar{\nu }}_{\ell }$ semileptonic decays using QCD Sum Rules