Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$

Abstract

We report the first measurement of the $\tau$ lepton polarization $P_{\tau }(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ as well as a new measurement of the ratio of the branching fractions $R(D^{\ast })=\mathcal{B}(\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau })/\mathcal{B}(\bar{B}\to D^{\ast }{\ell }^{-}{\bar{\nu }}_{\ell })$, where ${\ell }^{-}$ denotes an electron or a muon, and the $\tau$ is reconstructed in the modes ${\tau }^{-}\to {\pi }^{-}{\nu }_{\tau }$ and ${\tau }^{-}\to {\rho }^{-}{\nu }_{\tau }$. We use the full data sample of $772\times 10^6$ $B\bar{B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, $P_{\tau }(D^{\ast })=-0.38\pm 0.51{(stat.)}_{-0.16}^{+0.21}(syst.)$ and $R(D^{\ast })=0.270\pm 0.035{(stat.)}_{-0.025}^{+0.028}(syst.)$, are consistent with the theoretical predictions of the Standard Model.

arXiv comment7 pages, 2 figures, submitted to Physical Review Letters; one figure was removed from the first version

References in corpus (36)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
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• New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• Baryonic heavy-to-light form factors induced by tensor current in light-front approach
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• Investigating the effect of $U_1$ vector leptoquark on $b\to u\tau \bar{\nu }$ mediated $B$ decays
• Radiative Semileptonic $\bar{B}$ Decays
• Test of lepton flavor universality with measurements of $R(D^{+})$ and $R(D^{\ast +})$ using semileptonic $B$ tagging at the Belle II experiment
• Extra gauge bosons and lepton flavor universality violation in ${\rm Y}$ and $B$ meson decays
• Impact of $b\to c$ measurements on ${\Lambda }_b\to p\tau \bar{\nu }$ decay in $U_1$ leptoquark model
• Singlet vector leptoquark model facing recent LHCb and BABAR measurements
• The Neutrino Magnetic Moment Portal
• Search for leptoquark pair production decaying into $t{e}^{-}\bar{t}{e}^{+}$ or $t{\mu }^{-}\bar{t}{\mu }^{+}$ in multi-lepton final states in $pp$ collisions at 13 TeV with the ATLAS detector
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• Lepton nonuniversality anomalies and implications
• Search for pair production of scalar and vector leptoquarks decaying to muons and bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for charged-lepton-flavour violating $\mu \tau qt$ interactions in top-quark production and decay in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector at the LHC
• Rare decays of b hadrons
• Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies
• Clifford-based spectral action and renormalization group analysis of the gauge couplings
• Exploring the role of new physics in $b\to u\tau \bar{\nu }$ decays
• Generic tests of CP-violation in high-$p_{\text{T}}$ multi-lepton signals at the LHC and beyond
• Lepton Flavor Violating $B\to K_2^{\ast }(1430){\mu }^{\pm }{\tau }^{\mp }$ Decays
• Branching Fraction of the Decay $B^{+}\to {\pi }^{+}{\tau }^{+}{\tau }^{-}$ and Lepton Flavor Universality Test via the Ratio $R_{\pi }(\tau /\mu )$
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• Testing Lepton Flavour Universality in ${\rm Y}(4S)$ Decays
• Electric Dipole Moments as Probes of $B$ Anomaly
• Corrections to $R_D$ and $R_{D^{\ast }}$ in the BLMSSM
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• 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
• Angular analysis of $\bar{B}\to D_2^{\ast }(\to D\pi )\ell \bar{\nu }$ decay and new physics
• $B$ anomalies in the nonminimal universal extra dimension model
• Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw
• A Search for Charged Lepton Flavor Violation in the Mu2e Experiment
• Experimental summary of the $52^{\mathrm{nd}}$ Rencontres de Moriond session on Electroweak Interactions and Unified Theories
• Explaining B decays anomalies in SUSY models
• Implications of new physics in $B\to K_1{\mu }^{+}{\mu }^{-}$ decay processes
• Study of angular observables in exclusive semileptonic $B_c$ decays
• Flavour anomalies meet flavour symmetry
• The Radiative Flavor Template at the LHC: Lepton non-universality and g-2
• Status of G2HDM with right handed neutrino coupling in the light of $b\to c\tau \nu$ anomalies
• Closing the Gap on $R_{D^{\ast }}$ by including longitudinal effects
• Prospects for $B_c^{+}\to {\tau }^{+}{\nu }_{\tau }$ at FCC-ee
• Probing Light Scalars and Vector-like Quarks at the High-Luminosity LHC
• Hint of a new scalar interaction in LHCb data?
• Probing Compressed Mass Spectrum Supersymmetry at the LHC with the Vector Boson Fusion Topology
• Neutron decay into a Dark Sector via Leptoquarks
• Recent progress in decays of $b$ and $c$ hadrons
• 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
• Quark and lepton flavor model with leptoquarks in a modular $A_4$ symmetry
• Probing new physics at the LHC with $\mathrm{b}\tau \nu$ final states
• Flavour Physics from Present to Future Colliders
• Rare b-hadron decays as probe of new physics
• Leveraging intermediate resonances to probe CP violation at colliders
• Joint LHCb--Belle II Prospects to Constrain New Physics in $B\to D^{(\ast )}\tau \nu$
• Predictions for ${\Lambda }_b\to {\Lambda }_c\tau \bar{\nu }$ in BLSSM with Inverse seesaw
• Lepton universality tests and searches for new physics in charged current decays at Belle II
• Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{td}/V_{ts}$ and ${\epsilon }^{\prime }/\epsilon$: Summary of CKM 2018 working group 3
• Measurement of high-mass $t\bar{t}{\ell }^{+}{\ell }^{-}$ production and lepton flavour universality-inspired effective field theory interpretations at $\sqrt{s}=13$ TeV with the ATLAS detector
• Leptoquarks in B-meson anomalies: simplified models and HL-LHC discovery prospects
• Flavor Anomalies and Quark-Lepton Unification
• ${\eta }_c$ leading-twist distribution amplitude and the $B_c\to {\eta }_c\ell {\bar{\nu }}_{\ell }$ semileptonic decays using QCD Sum Rules
• Search for heavy neutral resonances decaying to tau lepton pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Theoretical implications of recent heavy flavour measurements at the LHC
• Impact of nuclear gluon distributions on neutrino-induced leptoquark production
• 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
• Tests of Lepton Flavour Universality with Semileptonic Decays at LHCb
• A self-calibrating, double-ratio method to test tau lepton universality in W boson decays at the LHC
• Anomalies in the heavy sector