We measure the branching fraction of B-→τ -ν̄τ using the full Υ(4S) data sample containing 772×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events with BB̄ pairs are tagged by reconstructing one of the B mesons decaying into hadronic final states, and B-→τ -ν̄τ candidates are detected in the recoil. We find evidence for B-→τ -ν̄τ with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction B(B -→τ-ν̄τ)=[0.72-0.25+0. 27(stat)±0.11(syst)]×10-4. © 2013 American Physical Society.

Jim Libby

Department Of Physics

Atomic physics

Physics

ASYMMETRIC ENERGY

B mesons

BELLE DETECTORS

BRANCHING FRACTIONS

Data sample

Final state

Standard deviation

Systematic errors

article

elementary particle

methodology

Nuclear physics

quantum theory

Elementary particles

Fulltext

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Physical Review Letters

We report the results of a search for the rare, purely leptonic decay B-→μ-ν μ performed with a 711 fb-1 data sample that contains 772×106 BB pairs, collected near the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B-→μ-νμ)=(6.46±2.22±1.60)×10-7 or a frequentist 90% confidence level interval on the B-→μ-ν μ branching fraction of [2.9,10.7]×10-7. © 2018 authors. Published by the American Physical Society.

Search for B- →μ- ν μ Decays at the Belle Experiment

We present the results of a search for the rare decays B→hνν, where h stands for K+,KS0,K∗+,K∗0,π+,π0,ρ+ and ρ0. The results are obtained with 772×106 BB pairs collected with the Belle detector at the KEKB e+e- collider. We reconstruct one B meson in a semileptonic decay and require a single h meson but nothing else on the signal side. We observe no significant signal and set upper limits on the branching fractions. The limits set on the B0→KS0νν, B0→K∗0νν, B+→π+νν, B0→π0νν, B+→ρ+νν, and B0→ρ0νν channels are the world's most stringent. © 2017 American Physical Society.

Physical Review D

Publisher’s Note: Search for B→hνν¯ decays with semileptonic tagging at Belle [Phys. Rev. D 96 , 091101(R) (2017)]

We report a measurement of the branching fraction of B+→τ+ντ decays using a data sample of 772×106BB¯ pairs, collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the recoiling B candidate in the decay channel B+→τ+ντ. We obtain a branching fraction of B(B+→τ+ντ)=[1.25±0.28(stat.)±0.27(syst.)]×10-4. This result is in good agreement with previous measurements and the expectation from the calculation based on the Standard Model. © 2015 American Physical Society. © 2015 American Physical Society.

Physical Review D - Particles, Fields, Gravitation and Cosmology

Measurement of the branching fraction of B+ →τ+ντ decays with the semileptonic tagging method

Review of Particle Physics

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

A hierarchical NeuroBayes-based algorithm for full reconstruction of B mesons at B factories

Evidence forB−→τ−ν¯τwith a semileptonic tagging method

Search forB+→ℓ+νℓrecoiling againstB−→D0ℓ−ν¯X

Evidence of the Purely Leptonic DecayB−→τ−ν¯τ

Evidence for B-→τ-ν̄τ with a hadronic tagging method using the full data sample of belle

Journal	Data powered by TypesetPhysical Review Letters
Publisher	Data powered by TypesetAmerican Physical Society
ISSN	00319007
Open Access	No