Measurement of the ratio of branching fractions $\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$

Abstract

The branching fraction ratio $\mathcal{R}(D^{\ast })\equiv \mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$ is measured using a sample of proton-proton collision data corresponding to 3.0\invfb of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode ${\tau }^{-}\to {\mu }^{-}{\overline{\nu }}_{\mu }{\nu }_{\tau }$. The semitauonic decay is sensitive to contributions from non-Standard-Model particles that preferentially couple to the third generation of fermions, in particular Higgs-like charged scalars. A multidimensional fit to kinematic distributions of the candidate ${\overline{B}}^0$ decays gives $\mathcal{R}(D^{\ast })=0.336\pm 0.027(stat)\pm 0.030(syst)$. This result, which is the first measurement of this quantity at a hadron collider, is 2.1 standard deviations larger than the value expected from lepton universality in the Standard Model.

17 pages, 1 figure. v2 after referees' comments

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• Status of Flavour Maximal Non-minimal Universal Extra Dimension
• Unified resolution of the $R(D)$ and $R(D^{\ast })$ anomalies and the lepton flavor violating decay $h\to \mu \tau$
• Charged Higgs boson contribution to $B_q^{-}\to \ell \bar{\nu }$ and $\bar{B}\to (P,V)\ell \bar{\nu }$ in a generic two-Higgs doublet model
• Testing Leptoquark and $Z^{\prime }$ Models via $B\to K_1(1270,1400){\mu }^{+}{\mu }^{-}$ Decays
• Constraints on 2l2q operators from $\mu -e$ flavour-changing meson decays
• Current status of MSSM Higgs sector with LHC 13 TeV data
• Flavour anomalies: a review
• Phenomenology of TeV-scale scalar Leptoquarks in the EFT
• Flavour anomalies on the eve of the Run-2 verdict
• Scotogenic Dirac neutrino mass models embedded with leptoquarks: one pathway to address the flavor anomalies and the neutrino masses together
• Constraints on Scalar Leptoquark from Kaon Sector
• Measurement of the branching fraction of leptonic decay $D_s^{+}\to {\tau }^{+}{\nu }_{\tau }$ via ${\tau }^{+}\to {\pi }^{+}{\pi }^0{\bar{\nu }}_{\tau }$
• Lepton-flavor universality limits in warped space
• Marriage between neutrino mass and flavor anomalies
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Observation of the decay $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$
• Signatures of complex new physics in $b\to c\tau \bar{\nu }$ transitions
• Measurement of the branching fraction ratios $R(D^{+})$ and $R(D^{\ast +})$ using muonic $\tau$ decays
• Observation of $D_s^{+}\to {\eta }^{\prime }{\mu }^{+}{\nu }_{\mu }$, Precision Test of Lepton Flavor Universality with $D_s^{+}\to {\eta }^{(\prime )}{\ell }^{+}{\nu }_{\ell }$, and First Measurements of $D_s^{+}\to {\eta }^{(\prime )}{\mu }^{+}{\nu }_{\mu }$ Decay Dynamics
• Semi-leptonic decays of $B^{\ast }$, $B_s^{\ast }$, and $B_c^{\ast }$ with the Bethe-Salpeter method
• $\bar{B}\to D^{(\ast )}\ell \bar{X}$ decays in effective field theory with massive right-handed neutrinos
• Lepton mass effects in exclusive semileptonic $B_c$-meson decays
• B Anomalies and Leptoquarks at the LHC: Beyond the Lepton-Quark Final State
• Addendum to: Combined Constraints on First Generation Leptoquarks
• Accidental scale-invariant Majorana dark matter in leptoquark-Higgs portals
• Lepton flavour violation in rare ${\Lambda }_b$ decays
• The LFU Ratio $R_{\pi }$ in the Standard Model and Beyond
• Heavy baryon wave functions, Bakamjian-Thomas approach to form factors, and observables in ${\Lambda }_b\to {\Lambda }_c\left({\frac{1}{2}}^{\pm }\right)\ell \overline{\nu }$ transitions
• Precise probing and discrimination of third-generation scalar leptoquarks
• Leptonic D_s decays in two-flavour lattice QCD
• Predicting and Discovering True Muonium
• Future Experimental Improvement for the Search of LNV Process in $e\mu$ Sector
• Scrutinizing New Physics in Semi-leptonic $B_c\to J/\psi \tau \nu$ Decay
• Studies of Lepton Flavor Violation at the LHC
• Leptoquarks and Real Singlets: A Richer Scalar Sector Behind the Origin of Dark Matter
• Implication of $b\to c\tau \nu$ flavor anomalies on $B_s\to D_s^{\ast }\tau \nu$ decay observables
• Restudy of the color-allowed two-body nonleptonic decay of bottom baryons ${\Xi }_b$ and ${\Omega }_b$ supported by hadron spectroscopy
• First Measurement of the Absolute Branching Fraction of $\Lambda \to p{\mu }^{-}{\bar{\nu }}_{\mu }$
• Predictions of Angular Observables for ${\bar{B}}_s\to K^{\ast }\ell \ell$ and $\bar{B}\to \rho \ell \ell$ in Standard Model
• $D^{\ast }$ Polarization as an Additional Constraint on New Physics in the $b\to c\tau {\bar{\nu }}_{\tau }$ Transition
• Semileptonic decays of $B_c$ meson to $P$-wave charmonium states
• Bottom-quark Forward-Backward Asymmetry, Dark Matter and the LHC
• Probing new physics in semileptonic ${\Sigma }_b$ and ${\Omega }_b$ decays
• ${\bar{B}}_c\to {\eta }_c$, ${\bar{B}}_c\to J/\psi$ and $\bar{B}\to D^{(\ast )}$ semileptonic decays including new physics
• Technicolor models with coupled systems of Schwinger-Dyson equations
• New physics footprints in the angular distribution of $B_s\to D_s^{\ast }(\to D_s\gamma ,D_s\pi )\tau \nu$ decays
• Detailed Study of the Decay Lambda_b --> Lambda_c tau {\bar ν}_τ
• Hadronic Vacuum Polarization in True Muonium
• Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models
• Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays
• Exclusive semileptonic $B_c$-meson decays to radially excited charmonium and charm meson states
• Relativistic calculations of $R(D^{(\ast )})$, $R(D_s^{(\ast )})$, $R({\eta }_c)$ and $R(J/\psi )$
• Constraints on scalar and vector leptoquarks from the LHC Higgs data
• $B-L$ violating nucleon decays as a probe of leptoquarks and implications for baryogenesis
• Non-resonant Leptoquark with multigeneration couplings to $\mu \mu jj$ and $\mu \nu jj$ at LHC
• Physics Goals and Experimental Challenges of the Proton-Proton High-Luminosity Operation of the LHC
• Investigating the transition form factors of ${\Lambda }_b\to {\Lambda }_c(2625)$ and ${\Xi }_b\to {\Xi }_c(2815)$ and the corresponding weak decays with support from baryon spectroscopy
• Transition form factors and angular distributions of the ${\mathbf{\Lambda }}_{\mathbf{b}}\to \mathbf{\Lambda }(1520)(\to \mathbf{N}\bar{\mathbf{K}}){\mathbf{\ell }}^{+}{\mathbf{\ell }}^{-}$ decay supported by baryon spectroscopy
• Light quark decays of doubly heavy baryons in light front approach
• New physics contributions in $B\to \pi \tau \bar{\nu }$ and $B\to \tau \bar{\nu }$
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• First observation of $B\to {\bar{D}}_1(\to \bar{D}{\pi }^{+}{\pi }^{-}){\ell }^{+}{\nu }_{\ell }$ and measurement of the $B\to {\bar{D}}^{(\ast )}\pi {\ell }^{+}{\nu }_{\ell }$ and $B\to {\bar{D}}^{(\ast )}{\pi }^{+}{\pi }^{-}{\ell }^{+}{\nu }_{\ell }$ branching fractions with hadronic tagging at Belle
• Measuring CP violation in $b\to c{\tau }^{-}{\bar{\nu }}_{\tau }$ using excited charm mesons
• Discovering True Muonium in $K_L\to ({\mu }^{+}{\mu }^{-})\gamma$
• Measurement of the B^0 -> D^*- pi^+ pi^- pi^+ branching fraction
• New physics effects on ${\Lambda }_b\to {\Lambda }_c^{\ast }\tau {\bar{\nu }}_{\tau }$ decays
• High $p_T$ correlated tests of lepton universality in lepton(s) + jet(s) processes; an EFT analysis
• Time-reversal asymmetries in ${\Lambda }_b$ semileptonic decays
• Implications for the $\Delta A_{FB}$ anomaly in ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}\bar{\nu }$ using a new Monte Carlo Event Generator
• Scouring meson decays for true muonium
• Importance of vector leptoquark-scalar box diagrams in Pati-Salam unification with vector-like families
• Interplay of the charged Higgs effects in $R_{D^{(\ast )}}$, $b\to s{\ell }^{+}{\ell }^{-}$ and $W$-mass
• Measurement of the relative $B^{-}\to D^0/D^{\ast 0}/D^{\ast \ast 0}{\mu }^{-}{\overline{\nu }}_{\mu }$ branching fractions using $B^{-}$ mesons from $\overline{B}{}_{s2}^{\ast 0}$ decays
• Implications of light $Z^{\prime }$ on semileptonic $B(B_s)\to T\{K_2^{\ast }(1430)$ $(f_2^{\prime }(1525))\}{\ell }^{+}{\ell }^{-}$ decays at large recoil
• Hyperfine Splitting in True Muonium to $\mathcal{O}(m_{\mu }{\alpha }^6)$: Two Photon Annihilation Contribution from Other Flavors
• The Belle II experiment: fundamental physics at the flavor frontier
• Flavor changing top decays to charm and Higgs with $\tau \tau$ at the LHC
• The ratio $\mathcal{R}(D_s)$ for $B_s\to D_s\ell {\nu }_{\ell }$ by using the QCD light-cone sum rules within the framework of heavy quark effective field theory
• Analysis of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ rare decays in a non-universal $Z^{\prime }$ model
• Observation of the Decay $D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }$
• Leptoquarks in Flavour Physics
• Lowering the scale of Pati-Salam breaking through seesaw mixing
• The TopFlavor scheme in the context of $W^{\prime }$ searches at LHC
• RooHammerModel: interfacing the HAMMER software tool with the HistFactory package
• Perspectives and Outlook from HEP Window on the Universe
• Tests of light-lepton universality in angular asymmetries of $B^0\to D^{\ast -}\ell \nu$ decays
• Measurement of the branching fraction of $B\to D^{(\ast )}\pi \ell \nu$ at Belle using hadronic tagging in fully reconstructed events
• A Challenge to Lepton Universality in B Meson Decays
• Towards a discovery of BSM physics from the Cabibbo angle anomaly
• Improved measurement of the branching fraction of $D_s^{+}\to {\mu }^{+}{\nu }_{\mu }$
• A comprehensive study of vector leptoquark with $U(1{)}_{B_3-L_2}$ on the $B$-meson and Muon g-2 anomalies
• Precision measurement of the $\mathcal{B}({\rm Y}(3S)\to {\tau }^{+}{\tau }^{-})/\mathcal{B}({\rm Y}(3S)\to {\mu }^{+}{\mu }^{-})$ ratio
• Semileptonic Decay of $B_c$ to ${\eta }_c$ and $J/\psi$ on the Light Front
• New physics in the angular distribution of $B_c^{-}\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ decay
• Decadal Mission for the New Physics Higgs/Flavor Era
• $B_s$-${\bar{B}}_s$ mixing interplay with $B$ anomalies
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• Strategy to measure tau $g-2$ via photon fusion in LHC proton collisions
• Observation of $D^{+}\to {\eta }^{\prime }{\mu }^{+}{\nu }_{\mu }$ and First Study of $D^{+}\to {\eta }^{\prime }{\ell }^{+}{\nu }_{\ell }$ Decay Dynamics
• Simplified models of vector $SU(4)$ leptoquarks at the TeV
• Radiative Semileptonic $\bar{B}$ Decays
• Determination of mass hierarchy with ${\nu }_{\mu }\to {\nu }_{\tau }$ appearance and the effect of nonstandard interactions
• Extra gauge bosons and lepton flavor universality violation in ${\rm Y}$ and $B$ meson decays
• The Neutrino Magnetic Moment Portal
• Model independent investigation of rare semileptonic b \to u l \barν_l decay processes
• 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 opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies
• Interpreting B-anomalies within an extended 331 gauge theory
• $B_c$ to $A$ Transition Form Factors and Semileptonic Decays in Self-consistent Covariant Light-front Approach
• Angular distribution as an effective probe of new physics in semi-hadronic three-body meson decays
• Clifford-based spectral action and renormalization group analysis of the gauge couplings
• 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
• High Resolution Nonperturbative Light-Front Simulations of the True Muonium Atom
• Test of lepton flavor universality in semileptonic B${}_{\text{c}}^{+}$ meson decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• $B_c$ decays from highly improved staggered quarks and NRQCD
• 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
• Rare decays of b hadrons
• Lepton nonuniversality anomalies and implications
• Searching for New Physics in Semi-Leptonic Baryon Decays
• Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• Electric Dipole Moments as Probes of $B$ Anomaly
• Corrections to $R_D$ and $R_{D^{\ast }}$ in the BLMSSM
• Three Lectures of Flavor and CP violation within and Beyond the Standard Model
• 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
• Angular analysis of $\bar{B}\to D_2^{\ast }(\to D\pi )\ell \bar{\nu }$ decay and new physics
• 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
• 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
• $B$ anomalies in the nonminimal universal extra dimension model
• Testing Lepton Flavour Universality in ${\rm Y}(4S)$ Decays
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• Status after the first LHC run: Looking for new directions in the physics landscape
• Exploring the role of new physics in $b\to u\tau \bar{\nu }$ decays
• Flavour Anomalies: A comparative analysis using a machine learning algorithm
• Flavour anomalies meet flavour symmetry
• Towards constraining triple gluon operators through tops
• CP violation and CKM studies (and first LHCb Run II results)
• Status of G2HDM with right handed neutrino coupling in the light of $b\to c\tau \nu$ anomalies
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark 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
• Study of $B_s^0\to l^{+}{l}^{-}\gamma$ decays in the nonuniversal Z' model
• Rare decays of the $B_s-$meson into four charged leptons in the framework of the Standard Model
• The Radiative Flavor Template at the LHC: Lepton non-universality and g-2
• Experimental summary of the $52^{\mathrm{nd}}$ Rencontres de Moriond session on Electroweak Interactions and Unified Theories
• Probing Light Scalars and Vector-like Quarks at the High-Luminosity LHC
• Neutron decay into a Dark Sector via Leptoquarks
• Studying low-$x$ structure function models with astrophysical tau neutrinos: double bang, lollipop and sugardaddy topologies
• On the $D_s^{\ast }$ and charmonia leptonic decays
• Rare b-hadron decays as probe of new physics
• A 331 Model for Lepton Flavor Universality Violation in $B$ Decays
• Searches for $B^0\to K^{+}{\pi }^{-}{\tau }^{+}{\tau }^{-}$ and $B_s^0\to K^{+}{K}^{-}{\tau }^{+}{\tau }^{-}$ decays
• Epsilon_K in the Standard Model and the kaon phase conventions
• Precision Measurement of the Branching Fraction of $D^{+}\to {\mu }^{+}{\nu }_{\mu }$
• Closing the Gap on $R_{D^{\ast }}$ by including longitudinal effects
• Prospects for $B_c^{+}\to {\tau }^{+}{\nu }_{\tau }$ at FCC-ee
• Tensions in the flavour sector
• Flavour Physics from Present to Future Colliders
• Probing new physics at the LHC with $\mathrm{b}\tau \nu$ final states
• Anomalies in the heavy sector
• Lepton Flavour Universality tests in $b\to cl\nu$ decays at LHCb
• Single-top production and rare top interactions
• Tests of Lepton Flavour Universality with Semileptonic Decays at LHCb
• 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
• Leptoquarks in B-meson anomalies: simplified models and HL-LHC discovery prospects
• 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
• Diagnosing New Physics with LUV and LFV B Decays
• Flavor Anomalies and Quark-Lepton Unification
• Weakly supervised anomaly detection with event-level variables
• ${\eta }_c$ leading-twist distribution amplitude and the $B_c\to {\eta }_c\ell {\bar{\nu }}_{\ell }$ semileptonic decays using QCD Sum Rules
• Lepton Flavour Universality tests and Lepton Flavour Violation searches at LHCb
• Theoretical implications of recent heavy flavour measurements at the LHC
• New Physics in $B$ decays
• Search for heavy neutral resonances decaying to tau lepton pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• A self-calibrating, double-ratio method to test tau lepton universality in W boson decays at the LHC
• Form factors and differential distributions in rare radiative leptonic B-decays
• Vacuum stability in an extended standard model with a leptoquark
• Experimental summary: step-by-step towards new physics
• Recent results from the Belle experiment