Evidence for $B^- \to \tau^- \bar{\nu}_\tau$ with a Hadronic Tagging Method Using the Full Data Sample of Belle - INSPIRE

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Evidence for $B^- \to \tau^- \bar{\nu}_\tau$ with a Hadronic Tagging Method Using the Full Data Sample of Belle

Belle

Collaboration

Aug, 2012

6 pages

Published in:

Phys.Rev.Lett. 110 (2013) 13, 131801

Published: Mar 25, 2013

e-Print:

1208.4678 [hep-ex]

DOI:

10.1103/PhysRevLett.110.131801

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \tau}^{+}}{{\mathit \nu}_{{{\tau}}}}

Report number:

BELLE-CONF-1201,
KEK-PREPRINT-2012-28,
BELLE-PREPRINT-2012-26

Experiments:

KEK-BF-BELLE

View in:

reference search275 citations

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Abstract: (APS)

We measure the branching fraction of B-→τ-ν¯τ using the full Υ(4S) data sample containing 772×106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events with BB¯ pairs are tagged by reconstructing one of the B mesons decaying into hadronic final states, and B-→τ-ν¯τ candidates are detected in the recoil. We find evidence for B-→τ-ν¯τ with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction B(B-→τ-ν¯τ)=[0.72-0.25+0.27(stat)±0.11(syst)]×10-4.

Note:

6 pages, 2 figures, figure 1 replaced, version published in PRL

13.20.He
14.40.Nd
B-: branching ratio: measured
B-: leptonic decay
BELLE
KEK-B
tau: semileptonic decay
tau: leptonic decay
electron positron: annihilation
B: pair production

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Figures(6)

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