Search for the Decays Bs0→τ+τ− and B0→τ+τ−

2017/03/31 by LHCb collaboration, R. Aaij, B. Adeva +782 · 1 citation
Mathematics · Physics and Astronomy · #Branching fraction #Combinatorics #Electron–positron annihilation #Hadron #High-Energy Particle Collisions Research #Lepton #Mathematics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.118.251802

published as Phys. Rev. Lett. 118, 251802 (2017) · 21 pages, 10 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-003.html

openalex created_date 2017/04/14 · openalex publication_date 2017/06/21 · arxiv created 2017/07/31 · arxiv updated 2017/08/01 · openalex updated_date 2026/08/06

Abstract

A search for the rare decays B_s⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath- and B⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath- is performed using proton--proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3 fb^\ensuremath-1 collected in 2011 and 2012. The \ensuremathτ leptons are reconstructed through the decay \ensuremathτ^\ensuremath-\ensuremath→\ensuremathπ^\ensuremath-\ensuremathπ⁺\ensuremathπ^\ensuremath-\ensuremathν_\ensuremathτ. Assuming no contribution from B⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath- decays, an upper limit is set on the branching fraction B(B_s⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath-)<6.8\ifmmode×\else\texttimes\fi10^\ensuremath-3 at the 95% confidence level. If instead no contribution from B_s⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath- decays is assumed, the limit is B(B⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath-)<2.1\ifmmode×\else\texttimes\fi10^\ensuremath-3 at the 95% confidence level. These results correspond to the first direct limit on B(B_s⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath-) and the world's best limit on B(B⁰\ensuremath→\ensuremathτ⁺\ensuremathτ^\ensuremath-).

Citations

• Study of variants for Monte Carlo generators of τ→ 3πν decays
• PHOTOS Monte Carlo: a precision tool for QED correctionsin Z and W decays
• Study of B -> D^(*)D_s(J)^(*) Decays andMeasurement of D_s^- and D_s(J)(2460)- Branching Fractions
• Presentation of search results: theCLstechnique
• A Neural Bayesian Estimator for Conditional Probability Densities
• Geant4 developments and applications
• Search for the Rare DecayB0→τ+τ−atBABAR
• Lepton universality violation and lepton flavor conservation in B-meson decays
• Review of Multibody Charm Analyses

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