Measurement of B- -> tau- nu_tau-bar Decay With a Semileptonic Tagging Method

2008/09/23 by I. Adachi, The Belle Collaboration, Adachi, I.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Superconducting Materials and Applications #hep-ex

paper · pdf · doi:10.48550/arxiv.0809.3834

10 pages, 2 figures, Contributed to the 34th International Conference On High Energy Physics (ICHEP 2008)

arxiv created 2008/09/23 · openalex publication_date 2008/09/23 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We present a new measurement of the decay B- -> tau- nu_tau-bar with a semileptonic B tagging method, using a data sample containing 657*10⁶ BB-bar pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric e+e- collider. A sample of BB pairs are tagged by reconstructing one B meson decaying semileptonically. We detect the B- -> tau- nu_tau-bar candidate in the recoil. We obtain a signal with a signicance of 3.8 standard deviations including systematics, and measure the branching fraction to be B(B- -> tau- nu_tau-bar)=(1.65+0.38-0.37(stat)+0.35-0.37(syst))*10⁴. This result confirms the evidence for B- -> tau- nu_tau-bartained in the previous Belle measurement with a hadronic B tagging method.

Related

• Rare B decays with leptons at Belle
• Measurement of the branching fraction of B⁺ -> tau⁺ nu_tau decays with the semileptonic tagging method
• Measurement of B -> D^(*) tau nu using full reconstruction tags
• Measurement of the Semileptonic Decays B --> D tau nubar and B --> D* tau nubar
• A Search for B- -> tau- nu-bar Recoiling Against a Fully Reconstructed B