Evidence for B- -> tau- nu_bar with a Semileptonic Tagging Method

Abstract

We present a measurement of the decay B- -> tau- nu_bar using a data sample containing 657 million BB_bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of BB_bar pairs are tagged by reconstructing one B meson decaying semileptonically. We detect the B- -> tau- nu_bar candidate in the recoil. We obtain a signal with a significance of 3.6 standard deviations including systematic uncertainties, and measure the branching fraction to be Br(B- -> tau- nu_bar) = [1.54+0.38-0.37(stat)+0.29-0.31(syst)]*10^-4. This result confirms the evidence for B- -> tau- nu_bar obtained in a previous Belle measurement that used a hadronic B tagging method.

7 pages, 3 figures, corrected references, to appear in PRD-RC

References in corpus (10)

• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Evidence of the Purely Leptonic Decay B- --> tau- nu_tau-bar
• Neutral B Meson Mixing in Unquenched Lattice QCD
• B-Bbar mixing in unquenched lattice QCD
• A Search for B+ -> tau+ nu Recoiling Against B- -> D0 l- nu X
• A Search for $B^{+}\to {\ell }^{+}{\nu }_{\ell }$ Recoiling Against $B^{-}\to D^0{\ell }^{-}\bar{\nu }X$
• A search for B+ --> tau+ nu with Hadronic B tags
• Lattice Calculation of Heavy-Light Decay Constants with Two Flavors of Dynamical Quarks
• B meson decay constant from two-flavor lattice QCD with non-relativistic heavy quarks
• Constraints on the R-parity Violating Couplings from $B^{\pm }\to l^{\pm }\nu$ Decays

Cited by in corpus (49)

• Theory and phenomenology of two-Higgs-doublet models
• Flavor-phenomenology of two-Higgs-doublet models with generic Yukawa structure
• Implications of lepton flavor universality violations in B decays
• Implications of LHCb measurements and future prospects
• Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
• Anatomy of New Physics in B-Bbar mixing
• B- and D-meson decay constants from three-flavor lattice QCD
• Evidence for B- -> tau- nu_tau-bar with a Hadronic Tagging Method Using the Full Data Sample of Belle
• $B\to \pi \ell {\nu }_l$ Width and $|V_{ub}|$ from QCD Light-Cone Sum Rules
• Summary of the ATLAS experiment's sensitivity to supersymmetry after LHC Run 1 - interpreted in the phenomenological MSSM
• On the anomalous enhancement observed in $B\to D^{(\ast )}\tau {\bar{\nu }}_{\tau }$ decays
• Evidence of B-->tau nu decays with hadronic B tags
• Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be explained by New Physics?
• The ${\rm Y}$ and ${{\rm Y}}^{\prime }$ Leptonic Widths, $a_{\mu }^b$ and $m_b$ from full lattice QCD
• A Minimal Flavor Violating 2HDM at the LHC
• FlavBit: A GAMBIT module for computing flavour observables and likelihoods
• Measurements of branching fractions of leptonic and hadronic Ds+ meson decays and extraction of the Ds+ meson decay constant
• B-meson decay constants from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
• How Constrained is the cMSSM?
• Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks
• Rare b hadron decays at the LHC
• Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of supersymmetry at the LHC?
• Phenomenological MSSM in light of new 13 TeV LHC data
• Flavor Physics and CP Violation
• Analysing parameter space correlations of recent 13 TeV gluino and squark searches in the pMSSM
• Exclusive weak B decays involving $\tau$ lepton in the relativistic quark model
• Implication of Higgs at 125 GeV within Stochastic Superspace Framework
• Measuring V_ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons
• Analyzing $b\to u$ transitions in semileptonic ${\bar{B}}_s\to K^{\ast +}(\to K\pi ){\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• $R(D^{(\ast )})$ and $\mathcal{B}r(B\to \tau {\nu }_{\tau })$ in a Flipped/Lepton-Specific 2HDM with anomalously enhanced charged Higgs coupling to $\tau$/b
• Observation of CP violation in $D^0\to K^{-}{\pi }^{+}$ as a smoking gun for New Physics
• Demise of CKM & its aftermath
• Recent Developments on the CKM Matrix
• Report of the Quark Flavor Physics Working Group
• B-Meson Decays into Final States with a tau Lepton
• Global CKM Fits with the Scan Method
• Search for $B^{+}\to e^{+}\nu$ and $B^{+}\to {\mu }^{+}\nu$ decays using hadronic tagging
• Search for $B^{+}\to e^{+}\nu$ and $B^{+}\to {\mu }^{+}\nu$ decays using hadronic tagging
• Charged Higgs contribution to ${\bar{B}}_s\to \varphi {\pi }^0$ and ${\bar{B}}_s\to \varphi {\rho }^0$
• Rare decays of b hadrons
• Experimental constraints from flavour changing processes and physics beyond the Standard Model
• Flavour physics, supersymmetry and grand unification
• Current status of the light neutralino thermal dark matter in the phenomenological MSSM
• Radiative corrections of $O(\alpha )$ to $B^{-}\to V^0{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• Decay of $B^{\pm }\to {\tau }^{\pm }+$ "missing momentum" and direct measurement of the mixing parameter $U_{\tau N}$
• B -> tau nu: Opening up the Charged Higgs Parameter Space with R-parity Violation
• The $s$-channel Charged Higgs in the Fully Hadronic Final State at LHC
• The Lee-Wick Extension of the Two-Higgs Doublet Model
• What We've Learned from Heavy Flavour Experiments Since CKM2010