Measurements of BR (b -> tau- nubar_tau X) and BR (b -> tau- nubar_tau D*+- X) and Upper Limits on BR (B- -> tau- nubar_tau) and BR (b -> s nu nubar)

Abstract

Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- X are measured to be (2.43 +/- 0.20 +/- 0.25)% and (0.88 +/- 0.31 +/- 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions b -> tau nu and b -> s nu nubar are set to 8.3 10**-4 and 6.4 10**-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c**2)**-1 to be set on the tan(beta)/mH+/- ratio, in the framework of type-II two-Higgs-doublet mode

25 pages, 8 figures

References in corpus (1)

• Combined results on b-hadron production rates, lifetimes, oscillations and semileptonic decays

Cited by in corpus (78)

• Minimal Flavour Violation: an effective field theory approach
• Precision Electroweak Measurements on the Z Resonance
• R-parity violating supersymmetry
• Testing leptoquark models in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• New strategies for New Physics search in B -> K* nu anti-nu, B -> K nu anti-nu and B -> X(s) nu anti-nu decays
• Towards the Identification of New Physics through Quark Flavour Violating Processes
• Flavor Physics in the Randall-Sundrum Model: II. Tree-Level Weak-Interaction Processes
• Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
• Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle
• The Anatomy of Quark Flavour Observables in 331 Models in the Flavour Precision Era
• Quark flavour mixing with right-handed currents: an effective theory approach
• Observation of B+ -> Dbar*0 tau+ nu_tau and Evidence for B+ -> Dbar^0 tau+ nu_tau at Belle
• Low-energy signatures of the ${\mathrm{PS}}^3$ model: from $B$-physics anomalies to LFV
• QCD Corrections to B -> X_{d,s} nu nubar, B_{d,s} -> l^+l^-, K -> pi nu nubar and K_L -> mu^+ mu^- in the MSSM
• The effect of H^\pm on B^\pm -> τ^\pm νand B^\pm -> μ^\pm ν
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar
• SM with four generations: Selected implications for rare B and K decays
• CP Violation in the B System and Relations to $K\to \pi \nu \bar{\nu }$ Decays
• Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu
• The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era
• Upper Bounds on Rare K and B Decays from Minimal Flavour Violation
• New Physics at a Super Flavor Factory
• Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
• A Consistent Resolution of Possible Anomalies in B^0 --> phi K_S and B^+ --> eta' K^+ Decays
• Interplay of dineutrino modes with semileptonic rare $\mathbf{B}$-decays
• Bounds on the Unitarity Triangle, $\sin 2\beta$ and $K\to \pi \nu \bar{\nu }$ Decays in Models with Minimal Flavour Violation
• The Private Higgs
• Flavour-Changing Neutral Currents and Leptophobic Z' Gauge Bosons
• Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery
• Standard Model Predictions for Rare K and B Decays without New Physics Infection
• Dark matter in U(1) extensions of the MSSM with gauge kinetic mixing
• Asymmetry Observables and the Origin of $R_{D^{(\ast )}}$ Anomalies
• Particle-Antiparticle Mixing, CP Violation and Rare K and B Decays in a Minimal Theory of Fermion Masses
• Charged $B$ Mesogenesis
• Unleashing the full power of LHCb to probe Stealth New Physics
• Determining the Sign of the Z-Penguin Amplitude
• Constraining Models of New Physics in Light of Recent Experimental Results on $a_{\psi K_S}$
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• Classification of anomaly-free 2HDMs with a gauged U(1)' symmetry
• New physics in inclusive $B\to X_c\ell \bar{\nu }$ decay in light of $R(D^{(\ast )})$ measurements
• Measurement of the Semileptonic Decays B --> D tau- nubar_tau and B --> D* tau- nubar_tau
• New physics in inclusive semileptonic $B$ decays including nonperturbative corrections
• Future prospects of B physics
• Measurement of the Branching Ratio for the Process b -> tau nu X
• Update of the flavour-physics constraints in the NMSSM
• Anomalous $tqZ$ coupling effects in rare B- and K-meson decays
• Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle
• The first limit on invisible decays of $B_s$ mesons comes from LEP
• Impact of new invisible particles on $B\to K^{(\ast )}{E}_{\mathrm{miss}}$ observables
• Search for B0 Decays to Invisible Final States and to nu nubar gamma
• R Parity violating enhancement of Bu -> l nu and Bc -> l nu
• Rare decays: theory vs. experiments
• Prospects on searches for baryonic Dark Matter produced in $b$-hadron decays at LHCb
• Charmless Non-Leptonic B Decays and R-parity Violating Supersymmetry
• b\to sν\barν decay in the MSSM: Implication of b\to sγat large tan beta
• Search for $B$ Mesogenesis at BABAR
• Measuring B -> tau nu and B_c -> tau nu at the Z peak
• B-Meson Decays into Final States with a tau Lepton
• First Measurement of $R(X_{\tau /\ell })$ as an Inclusive Test of the $b\to c\tau \nu$ Anomaly
• D0 dimuon charge asymmetry from B_s system with Z' couplings and the recent LHCb result
• Flavor phenomenology of light dark sectors
• b -> s Decays in a model with Z-mediated flavor changing neutral current
• Testing Higgs boson scenarios in the phenomenological NMSSM
• Studying Exclusive Semi-leptonic $b\to (s,d)\nu \bar{\nu }$ Decays in the MSSM without R-parity
• Angular distribution asymmetry in tau^- --> pi^- pi^0 nu_tau decay in the two-Higgs-doublet model with large tan beta
• Revealing mass-degenerate states in Higgs boson signals
• $B\to X_s+$ missing energy in models with large extra dimensions
• Analysis of $b\to c\tau {\bar{\nu }}_{\tau }$ anomalies using weak effective Hamiltonian with complex couplings
• The study of NSIs in B and KL rare decays with three generations of quarks and interference effects between the standard model and NSIs
• On the angular distributions of tau- --> K_S pi-nu_tau decay
• Effects of charged Higgs bosons in the deep inelastic process ν_τ {\cal N} \to τ^- X and the possibility of detecting tau-neutrinos at cosmic neutrino detectors
• First search for $B\to X_s\nu \bar{\nu }$ decays
• The Strange Physics of Dark Baryons
• Lepton universality tests and searches for new physics in charged current decays at Belle II