Evidence for B+ → τ+ντ decays and measurement of fB from Belle

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We present the first evidence for B+ → τ +ντ decay, using 414 fb-1 of B meson decay event sample collected with the Belle detector at the KEKB e +e- collider. To cope with large missing energy due to multiple neutrinos in the final state, events are tagged by fully reconstructing one of the B mesons. We find the evidence for signal with a significance of 3.5 σ including systematic uncertainties. The branching fraction is measured to be B(B+→τ+ντ)=(1.79 -0.49-0.51+0.56+0.46)×10-4. From this we obtain fB=0.229-0.031-0.037+0.036+0.034GeV, the first direct determination of the B meson decay constant.

Original languageEnglish
Title of host publicationQUARK CONFINEMENT AND THE HADRON SPECTRUM VII
Subtitle of host publication7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7
Pages321-323
Number of pages3
DOIs
Publication statusPublished - 2007
EventQUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7 - Ponta Delgada, Acores, Portugal
Duration: 2006 Sep 22006 Sep 7

Publication series

NameAIP Conference Proceedings
Volume892
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherQUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7
CountryPortugal
CityPonta Delgada, Acores
Period06/9/206/9/7

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Evidence for B<sup>+</sup> → τ<sup>+</sup>ν<sub>τ</sub> decays and measurement of f<sub>B</sub> from Belle'. Together they form a unique fingerprint.

  • Cite this

    Kwon, Y. (2007). Evidence for B+ → τ+ντ decays and measurement of fB from Belle. In QUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7 (pp. 321-323). (AIP Conference Proceedings; Vol. 892). https://doi.org/10.1063/1.2714406