On the B to D* tau nu Sensitivity to New Physics

Abstract

B physics has played a prominent role in investigations of new physics effects at low-energies. Presently, the largest discrepancy between a standard model prediction and experimental measurements appears in the branching ratio of the charged current mediated B to tau nu decay, where the large tau mass lifts the helicity suppression arising in leptonic B decays. Less significant systematic deviations are also observed in the semileptonic B to D(*) tau nu rates. Due to the rich spin structure of the final state, the decay mode B to D* tau nu offers a number of tests of such possible standard model deviations. We investigate the most general set of lowest dimensional effective operators leading to helicity suppressed modifications of b to c (semi)leptonic transitions. We explore such contributions to the B to D* tau nu decay amplitudes by determining the differential decay rate, longitudinal D* polarization fraction, D* - tau opening angle asymmetry and the tau helicity asymmetry. We identify the size of possible new physics contributions constrained by the present B to D(*) tau nu rate measurements and find significant modifications are still possible in all of them. In particular, the opening angle asymmetry can be shifted by almost 30%, relative to the standard model prediction, while the tau helicity asymmetry can still deviate by as much as 80%.

arXiv comment10 pages, 4 figures; corrected several typos, added references, conclusions unchanged

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• Helicity amplitudes in $B\to D^{\ast }\bar{\nu }l$ decay
• Relations between $b\to c\tau \nu$ Decay Modes in Scalar Models
• Visible energy and angular distributions of the charged particle from the $\tau -$decay in $b\to c\tau (\mu {\bar{\nu }}_{\mu }{\nu }_{\tau },\pi {\nu }_{\tau },\rho {\nu }_{\tau }){\bar{\nu }}_{\tau }$ reactions
• Radiative corrections of $O(\alpha )$ to $B^{-}\to V^0{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• Probing the R-parity violating supersymmetric effects in $B_c\to J/\psi {\ell }^{-}{\bar{\nu }}_{\ell },{\eta }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ and ${\Lambda }_b\to {\Lambda }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• Evidence for $B^{-}\to D^{\ast \ast 0}{\tau }^{-}\overline{{\nu }_{\tau }}$ decays
• Status after the first LHC run: Looking for new directions in the physics landscape
• Challenges for New Physics in the Flavour Sector
• Search For New Physics at BABAR
• Corrections to $R_D$ and $R_{D^{\ast }}$ in the BLMSSM
• Polarization amplitudes in ${\tau }^{-}\to {\nu }_{\tau }VP$ decay beyond the standard model
• $\frac{|V_{ub}|}{|V_{cb}|}$ and Quest for New Physics
• Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
• New physics from flavour
• Explaining B decays anomalies in SUSY models
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Meson exchange between initial and final state and the $R_D$ ratio in the $\bar{B}\to D\bar{\nu }\ell ({\bar{\nu }}_{\tau }\tau )$ reactions
• Addressing the $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ puzzle through New Physics four-fermion operators and their impact on ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay
• Tensions in the flavour sector
• Rare b-hadron decays as probe of new physics
• Closing the Gap on $R_{D^{\ast }}$ by including longitudinal effects
• Inclusive quasielastic (anti-)neutrino nucleus scattering within the Standard Model and beyond
• Charged Higgs: Interpretation of $B$-physics results
• New Physics in $B$ decays
• Diagnosing New Physics with LUV and LFV B Decays
• Semileptonic $B\to \bar{D}$ transition in nuclear medium
• Semileptonic $B_s\to D_{s2}^{\ast }(2573)\ell {\bar{\nu }}_{\ell }$ transition in QCD
• Helicity amplitudes in the $\bar{B}\to D^{\ast }{\bar{\nu }}_{\tau }\tau$ decay with $V-A$ breaking in the quark sector
• Fingerprinting the presence of extra scalars in the $h\to Vf{f}^{\prime }$ forward-backward asymmetry
• Semi-leptonic Decay of Lambda-b in the Standard Model and with New Physics
• Lepton Universality Violation by Kaluza-Klein Neutrinos in $b\to sll$ transition
• The Angular Observables of ${\Lambda }_b\to {\Lambda }_c(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ within the Paradigm of FCCC Anomalies
• Probing New Physics and CP Violation in ${\nu }_{\tau }n\to {\Lambda }_c{\tau }^{-}({\pi }^{-}{\nu }_{\tau })$ and ${\bar{\nu }}_{\tau }p\to \Lambda {\tau }^{+}({\pi }^{+}{\bar{\nu }}_{\tau })$
• Recent results from the Belle experiment
• Experimental summary: step-by-step towards new physics
• A model to accommodate the $B$-physics anomalies
• Tests of Lepton Flavour Universality with Semileptonic Decays at LHCb