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Title: A Search for the Rare Decay B->tau+tau- at the BaBar Experiment

Abstract

The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.

Authors:
;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
877222
Report Number(s):
SLAC-R-805
TRN: US0700252
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; B MESONS; BRANCHING RATIO; DECAY; FLUCTUATIONS; PHYSICS; RESONANCE; STANDARD MODEL; STANFORD LINEAR ACCELERATOR CENTER; Experiment-HEP,HEPEX

Citation Formats

Potter, Christopher Thomas, and /Oregon U. A Search for the Rare Decay B->tau+tau- at the BaBar Experiment. United States: N. p., 2006. Web. doi:10.2172/877222.
Potter, Christopher Thomas, & /Oregon U. A Search for the Rare Decay B->tau+tau- at the BaBar Experiment. United States. doi:10.2172/877222.
Potter, Christopher Thomas, and /Oregon U. Tue . "A Search for the Rare Decay B->tau+tau- at the BaBar Experiment". United States. doi:10.2172/877222. https://www.osti.gov/servlets/purl/877222.
@article{osti_877222,
title = {A Search for the Rare Decay B->tau+tau- at the BaBar Experiment},
author = {Potter, Christopher Thomas and /Oregon U.},
abstractNote = {The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.},
doi = {10.2172/877222},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 07 00:00:00 EST 2006},
month = {Tue Mar 07 00:00:00 EST 2006}
}

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