skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Evidence for B+ {yields} {tau}+{nu}{tau} decays and measurement of fB from Belle

Abstract

We present the first evidence for B+ {yields} {tau}+{nu}{tau} 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 {sigma} including systematic uncertainties. The branching fraction is measured to be B(B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}}) (1.79{sub -0.49-0.51}{sup +0.56+0.46}) x 10{sup -4}. From this we obtain f{sub B} = 0.229{sub -0.031-0.037}{sup +0.036+0.034} GeV, the first direct determination of the B meson decay constant.

Authors:
 [1]
  1. Dept. of Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21056844
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 892; Journal Issue: 1; Conference: QCHS7: 7. conference on quark confinement and the hadron spectrum, Ponta Delgada, Acores (Portugal), 2-7 Sep 2006; Other Information: DOI: 10.1063/1.2714406; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). Belle Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B PLUS MESONS; BRANCHING RATIO; DECAY AMPLITUDES; ELECTRON-POSITRON INTERACTIONS; GEV RANGE; LEPTONIC DECAY; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; TAU NEUTRINOS; TAU PARTICLES

Citation Formats

Kwon, Youngjoon. Evidence for B+ {yields} {tau}+{nu}{tau} decays and measurement of fB from Belle. United States: N. p., 2007. Web. doi:10.1063/1.2714406.
Kwon, Youngjoon. Evidence for B+ {yields} {tau}+{nu}{tau} decays and measurement of fB from Belle. United States. doi:10.1063/1.2714406.
Kwon, Youngjoon. Tue . "Evidence for B+ {yields} {tau}+{nu}{tau} decays and measurement of fB from Belle". United States. doi:10.1063/1.2714406.
@article{osti_21056844,
title = {Evidence for B+ {yields} {tau}+{nu}{tau} decays and measurement of fB from Belle},
author = {Kwon, Youngjoon},
abstractNote = {We present the first evidence for B+ {yields} {tau}+{nu}{tau} 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 {sigma} including systematic uncertainties. The branching fraction is measured to be B(B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}}) (1.79{sub -0.49-0.51}{sup +0.56+0.46}) x 10{sup -4}. From this we obtain f{sub B} = 0.229{sub -0.031-0.037}{sup +0.036+0.034} GeV, the first direct determination of the B meson decay constant.},
doi = {10.1063/1.2714406},
journal = {AIP Conference Proceedings},
number = 1,
volume = 892,
place = {United States},
year = {Tue Feb 27 00:00:00 EST 2007},
month = {Tue Feb 27 00:00:00 EST 2007}
}