B-Meson Decays into Final States with a tau Lepton

Abstract

Decays of B mesons into final states containing a tau lepton are sensitive to new charged-current interactions that break lepton-flavor universality. These decays have been studied only at e+e- colliders, where the low-background environment and well-known initial state make it possible to observe small signals with undetectable neutrinos. In particular, the large data samples of the B factories and recent advances in techniques for full-event reconstruction have led to evidence for the decay B --> tau nu and unambiguous observation of the decays B --> D(*)tau nu. These results have led to exclusion of large regions of the parameter space for a variety of new-physics models. Furthermore, the branching fraction for B --> D(*)tau nu has been measured to be higher than the standard-model expectation by at least 3.4 standard deviations, making this an interesting topic for further research. This letter reviews the theoterical and experimental status of this topic, summarizing the results at this time and outlining the path for further improvements.

arXiv comment24 pages, 9 figures, submitted to Modern Physics Letters A

References in corpus (49)

• The BABAR Detector
• Evidence for an excess of B -> D(*) Tau Nu decays
• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• On the B to D* tau nu Sensitivity to New Physics
• Testing leptoquark models in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Implications of lepton flavor universality violations in B decays
• Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Evidence of the Purely Leptonic Decay B- --> tau- nu_tau-bar
• Sensitivity to charged scalars in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ and $B\to \tau {\nu }_{\tau }$ decays
• Search for a light charged Higgs boson in top quark decays in pp collisions at sqrt(s) = 7 TeV
• Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector
• Evidence for B- -> tau- nu_tau-bar with a Hadronic Tagging Method Using the Full Data Sample of Belle
• Predictions of selected flavour observables within the Standard Model
• $B\to \pi \ell {\nu }_l$ Width and $|V_{ub}|$ from QCD Light-Cone Sum Rules
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• Minimally flavored colored scalar in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and the mass matrices constraints
• Diagnosing New Physics in $b\to c\tau {\nu }_{\tau }$ decays in the light of the recent BaBar result
• Charged Higgs Effects on Exclusive Semi-tauonic $\bbox{B}$ Decays
• The B and B_s Meson Decay Constants from Lattice QCD
• On the anomalous enhancement observed in $B\to D^{(\ast )}\tau {\bar{\nu }}_{\tau }$ decays
• Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle
• 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
• Evidence of B-->tau nu decays with hadronic B tags
• Effects of right-handed charged currents on the determinations of |V_ub| and |V_cb|
• Tau longitudinal polarization in B -> D tau nu and its role in the search for charged Higgs boson
• 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)
• B decays with $\tau$-leptons in non-universal left-right models
• An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
• Possible evidence for the breakdown of the CKM-paradigm of CP-violation
• The Full $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution and CP violating Triple Products
• Measurement of |V_cb| and the Form-Factor Slope in Bbar -> D l- nubar Decays in Events Tagged by a Fully Reconstructed B Meson
• A Search for B+ -> tau+ nu Recoiling Against B- -> D0 l- nu X
• A Hierarchical NeuroBayes-based Algorithm for Full Reconstruction of B Mesons at B Factories
• Hints of R-parity violation in B decays into $\tau \nu$
• A Search for $B^{+}\to {\ell }^{+}{\nu }_{\ell }$ Recoiling Against $B^{-}\to D^0{\ell }^{-}\bar{\nu }X$
• Evidence for B- -> tau- nu_bar with a Semileptonic Tagging Method
• A search for B+ --> tau+ nu with Hadronic B tags
• Measurement of the form factors of the decay B0 -> D*- ell+ nu and determination of the CKM matrix element |Vcb|
• Measurements of the Semileptonic Decays $\Bb\to D\ell\nub$ and $\Bb\to D^*\ell\nub$ Using a Global Fit to $D X\ell\nub$ Final States
• B -> D^(*) tau nu and B -> tau nu in chiral U(1)' models with flavored multi Higgs doublets
• Effective theory approach to new physics in $b\to u$ and $b\to c$ leptonic and semileptonic decays
• Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of the CKM Matrix Element |V_cb|
• A Search for B+ -> tau+ nu
• A Search for $B\to \tau \nu$
• Search for the Rare Leptonic Decay B- -> tau- nubar
• Limits on New Physics from exclusive $B\to D^{(\ast )}\ell \bar{\nu }$ Decays
• Charged Track Multiplicity in B Meson Decay

Cited by in corpus (11)

• The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model
• Consequences of R-Parity violating interactions for anomalies in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and $b\to s{\mu }^{+}{\mu }^{-}$
• \large\bf $B_c\to (J/\Psi ,{\eta }_c)\tau \nu$ semileptonic decays within Standard model and beyond
• ${\Lambda }_b\to ({\Lambda }_c,p)\tau \nu$ decays within standard model and beyond
• Scalar doublet models confront $\tau$ and $b$ anomalies
• Model independent analysis of $b\to (c,u)\tau \nu$ leptonic and semileptonic decays
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino
• Recent Developments on the CKM Matrix
• Selected Topics in Heavy Flavour Physics
• Physical observables in the decay ${\Lambda }_b\to {\Lambda }_c(\to \Lambda +\pi )+{\tau }^{-}+{\bar{\nu }}_{\tau }$