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Title: Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}

Abstract

We present the first evidence of the decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}, using 414 fb{sup -1} of data collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}})=(1.79{sub -0.49}{sup +0.56}(stat){sub -0.51}{sup +0.4=} 6(syst))x10{sup -4}. This implies that f{sub B}=0.229{sub -0.031}{sup +0.036}(stat){sub -0.037}{sup +0.034}(syst) GeV and is the first direct measurement of this quantity.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Nagoya University, Nagoya (Japan)
  2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan) (and others)
Publication Date:
OSTI Identifier:
20861513
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.97.251802; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B MINUS MESONS; BRANCHING RATIO; GEV RANGE 01-10; LEPTONIC DECAY; TAU NEUTRINOS; TAU PARTICLES

Citation Formats

Ikado, K., Hayasaka, K., Hokuue, T., Iijima, T., Inami, K., Miyazaki, Y., Ohshima, T., Okabe, T., Senyo, K., Abe, K., Adachi, I., Akai, K., Akemoto, M., Flanagan, J., Furukawa, K., Gershon, T., Haba, J., Hara, K., Hazumi, M., and Iida, N. Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.251802.
Ikado, K., Hayasaka, K., Hokuue, T., Iijima, T., Inami, K., Miyazaki, Y., Ohshima, T., Okabe, T., Senyo, K., Abe, K., Adachi, I., Akai, K., Akemoto, M., Flanagan, J., Furukawa, K., Gershon, T., Haba, J., Hara, K., Hazumi, M., & Iida, N. Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}. United States. doi:10.1103/PHYSREVLETT.97.251802.
Ikado, K., Hayasaka, K., Hokuue, T., Iijima, T., Inami, K., Miyazaki, Y., Ohshima, T., Okabe, T., Senyo, K., Abe, K., Adachi, I., Akai, K., Akemoto, M., Flanagan, J., Furukawa, K., Gershon, T., Haba, J., Hara, K., Hazumi, M., and Iida, N. Fri . "Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}". United States. doi:10.1103/PHYSREVLETT.97.251802.
@article{osti_20861513,
title = {Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}},
author = {Ikado, K. and Hayasaka, K. and Hokuue, T. and Iijima, T. and Inami, K. and Miyazaki, Y. and Ohshima, T. and Okabe, T. and Senyo, K. and Abe, K. and Adachi, I. and Akai, K. and Akemoto, M. and Flanagan, J. and Furukawa, K. and Gershon, T. and Haba, J. and Hara, K. and Hazumi, M. and Iida, N.},
abstractNote = {We present the first evidence of the decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}, using 414 fb{sup -1} of data collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}})=(1.79{sub -0.49}{sup +0.56}(stat){sub -0.51}{sup +0.4=} 6(syst))x10{sup -4}. This implies that f{sub B}=0.229{sub -0.031}{sup +0.036}(stat){sub -0.037}{sup +0.034}(syst) GeV and is the first direct measurement of this quantity.},
doi = {10.1103/PHYSREVLETT.97.251802},
journal = {Physical Review Letters},
number = 25,
volume = 97,
place = {United States},
year = {Fri Dec 22 00:00:00 EST 2006},
month = {Fri Dec 22 00:00:00 EST 2006}
}