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Measurement of Cabibbo suppressed decays of the tau lepton

Collaboration
Feb, 1994
13 pages
Published in:
  • Phys.Rev.Lett. 73 (1994) 1079-1083
e-Print:
DOI:
Report number:
  • CLNS-94-1273,
  • CLEO-94-8,
  • CLNS94-1273
Experiments:
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Abstract: (arXiv)
Branching ratios for the dominant Cabibbo-suppressed decays of the τ\tau lepton have been measured by CLEO~II in e+e−e^+ e^- annihilation at CESR (s∼10.6\sqrt{s} \sim 10.6~GeV) using kaons with momenta below 0.7 GeV/c0.7\ \rm GeV/c. The inclusive branching ratio into one charged kaon is (1.60±0.12±0.19)%(1.60 \pm 0.12 \pm 0.19)\%. For the exclusive decays, B(τ→K−)=(0.66±0.07±0.09)%B(\tau \to K^-) = (0.66 \pm 0.07 \pm 0.09)\%, B(τ→K−π0)=(0.51±0.10±0.07)%B(\tau \to K^- \pi^0) = (0.51 \pm 0.10 \pm 0.07)\%, and, based on three events, B(\tau \to K^- \pi^0 \pi^0) < 0.3\% at the 90\% confidence level. These represent significant improvements over previous results. B(τ→K−π0)B(\tau\to K^- \pi^0) is measured for the first time with exclusive π0\pi^0 reconstruction.
Note:
  • 11 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sending mail to: preprints@lns62.lns.cornell.edu
  • electron positron: colliding beams
  • colliding beams: electron positron
  • electron positron: annihilation
  • annihilation: electron positron
  • tau: electroproduction
  • electroproduction: tau
  • tau: pair production
  • pair production: tau
  • tau: semileptonic decay
  • semileptonic decay: tau