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
Volume892
DOIs
Publication statusPublished - 2007 Apr 4
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

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

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mesons
decay
neutrinos
detectors
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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 (Vol. 892, pp. 321-323) https://doi.org/10.1063/1.2714406
Kwon, Youngjoon. / Evidence for B+ → τ+ντ decays and measurement of fB from Belle. QUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7. Vol. 892 2007. pp. 321-323
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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. vol. 892, pp. 321-323, QUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7, Ponta Delgada, Acores, Portugal, 06/9/2. https://doi.org/10.1063/1.2714406

Evidence for B+ → τ+ντ decays and measurement of fB from Belle. / Kwon, Youngjoon.

QUARK CONFINEMENT AND THE HADRON SPECTRUM VII: 7th Conference on Quark Confinement and the Hadron Spectrum, QCHS7. Vol. 892 2007. p. 321-323.

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

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Kwon Y. 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. Vol. 892. 2007. p. 321-323 https://doi.org/10.1063/1.2714406