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Title: Search for Lepton Flavor Violating Decays {tau}{sup {+-}}{yields}l{sup {+-}}{pi}{sup 0}, l{sup {+-}}{eta}, l{sup {+-}}{eta}{sup '}

Abstract

A search for lepton flavor violating decays of the {tau} lepton to a lighter mass lepton and a pseudoscalar meson has been performed using 339 fb{sup -1} of e{sup +}e{sup -} annihilation data collected at a center-of-mass energy near 10.58 GeV by the BABAR detector at the SLAC PEP-II storage ring. No evidence of a signal has been found, and upper limits on the branching fractions are set at the 10{sup -7} level.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ;  [4]; ; ;  [5];  [6]
  1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
  2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
  3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
  4. Institute of High Energy Physics, Beijing 100039 (China)
  5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
  6. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States) (and others)
Publication Date:
OSTI Identifier:
20955441
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevLett.98.061803; (c) 2007 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; ANNIHILATION; BRANCHING RATIO; ELECTRON-POSITRON INTERACTIONS; ELECTRONS; FLAVOR MODEL; GEV RANGE 10-100; MASS; PARTICLE DECAY; POSITRONS; PSEUDOSCALAR MESONS; STANFORD LINEAR ACCELERATOR CENTER; TAU PARTICLES

Citation Formats

Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. Search for Lepton Flavor Violating Decays {tau}{sup {+-}}{yields}l{sup {+-}}{pi}{sup 0}, l{sup {+-}}{eta}, l{sup {+-}}{eta}{sup '}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.061803.
Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., & Abrams, G. S. Search for Lepton Flavor Violating Decays {tau}{sup {+-}}{yields}l{sup {+-}}{pi}{sup 0}, l{sup {+-}}{eta}, l{sup {+-}}{eta}{sup '}. United States. doi:10.1103/PHYSREVLETT.98.061803.
Aubert, B., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J. P., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Ofte, I., Stugu, B., and Abrams, G. S. Fri . "Search for Lepton Flavor Violating Decays {tau}{sup {+-}}{yields}l{sup {+-}}{pi}{sup 0}, l{sup {+-}}{eta}, l{sup {+-}}{eta}{sup '}". United States. doi:10.1103/PHYSREVLETT.98.061803.
@article{osti_20955441,
title = {Search for Lepton Flavor Violating Decays {tau}{sup {+-}}{yields}l{sup {+-}}{pi}{sup 0}, l{sup {+-}}{eta}, l{sup {+-}}{eta}{sup '}},
author = {Aubert, B. and Bona, M. and Boutigny, D. and Couderc, F. and Karyotakis, Y. and Lees, J. P. and Poireau, V. and Tisserand, V. and Zghiche, A. and Grauges, E. and Palano, A. and Chen, J. C. and Qi, N. D. and Rong, G. and Wang, P. and Zhu, Y. S. and Eigen, G. and Ofte, I. and Stugu, B. and Abrams, G. S.},
abstractNote = {A search for lepton flavor violating decays of the {tau} lepton to a lighter mass lepton and a pseudoscalar meson has been performed using 339 fb{sup -1} of e{sup +}e{sup -} annihilation data collected at a center-of-mass energy near 10.58 GeV by the BABAR detector at the SLAC PEP-II storage ring. No evidence of a signal has been found, and upper limits on the branching fractions are set at the 10{sup -7} level.},
doi = {10.1103/PHYSREVLETT.98.061803},
journal = {Physical Review Letters},
number = 6,
volume = 98,
place = {United States},
year = {Fri Feb 09 00:00:00 EST 2007},
month = {Fri Feb 09 00:00:00 EST 2007}
}
  • A search for the lepton flavor violating decays {tau}{sup -}{yields}l{sup -}K{sub S}{sup 0} (l=e or {mu}) has been performed using a data sample corresponding to an integrated luminosity of 469 fb{sup -1}, collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} asymmetric energy collider. No statistically significant signal has been observed in either channel and the estimated upper limits on branching fractions are B({tau}{sup -}{yields}e{sup -}K{sub S}{sup 0})<3.3x10{sup -8} and B({tau}{sup -}{yields}{mu}{sup -}K{sub S}{sup 0})<4.0x10{sup -8} at 90% confidence level.
  • A search for lepton flavor violating decays of the {tau} lepton to a lighter mass lepton and a pseudoscalar meson has been performed using 339 fb{sup -1} of e{sup +}e{sup -} annihilation data collected at a center-of-mass energy near 10.58GeV by the BABAR detector at the SLAC PEP-II storage ring. No evidence of signal has been found, and upper limits on the branching fractions are set at 10{sup -7} level.
  • A search for lepton flavor violating decays of a {tau} to a lighter-mass charged lepton and an {omega} vector meson is performed using 384.1 fb{sup -1} of e{sup +}e{sup -} annihilation data collected with the BABAR detector at the Stanford Linear Accelerator Center PEP-II storage ring. No signal is found, and the upper limits on the branching ratios are determined to be B({tau}{sup {+-}}{yields}e{sup {+-}}{omega})<1.1x10{sup -7} and B({tau}{sup {+-}}{yields}{mu}{sup {+-}}{omega})<1.0x10{sup -7} at 90% confidence level.
  • A search for the neutrinoless, lepton-flavor violating decay of the tau lepton into three charged leptons has been performed using 376 fb{sup -1} of data collected at an e{sup +}e{sup -} center-of-mass energy around 10.58 GeV with the BABAR detector at the SLAC PEP-II storage rings. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (4-8)x10{sup -8} at 90% confidence level.
  • We present measurements of branching fractions for five B-meson decays to two-body charmless final states. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 459x10{sup 6} BB pairs. The results for branching fractions are, in units of 10{sup -6} (upper limits at 90% C.L.), B(B{sup +}{yields}{eta}{rho}{sup +})=9.9{+-}1.2{+-}0.8, B(B{sup 0}{yields}{eta}{sup '}{eta})=0.5{+-}0.4{+-}0.1(<1.2), B(B{sup 0}{yields}{eta}{pi}{sup 0})=0.9{+-}0.4{+-}0.1(<1.5), B(B{sup 0}{yields}{eta}{sup '}{pi}{sup 0})=0.9{+-}0.4{+-}0.1(<1.5), and B(B{sup 0}{yields}{omega}{pi}{sup 0})=0.07{+-}0.26{+-}0.02(<0.5). The first error quoted is statistical and the second systematic. For the {eta}{rho}{sup +} mode, we measure the charge asymmetry A{sub ch}(B{sup +}{yields}{eta}{rho}{sup +})=0.13{+-}0.11{+-}0.02.