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First Observation of the Decay {tau}{sup {minus}} {r_arrow} K{sup {asterisk}{minus}}{eta}{nu}{sub {tau}}

Journal Article · · Physical Review Letters
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  1. Purdue University, West Lafayette, Indiana 47907 (United States)
  2. University of Rochester, Rochester, New York 14627 (United States)
  3. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
  4. Southern Methodist University, Dallas, Texas 75275 (United States)
  5. Syracuse University, Syracuse, New York 13244 (United States)
  6. Vanderbilt University, Nashville, Tennessee 37235 (United States)
  7. Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
  8. Wayne State University, Detroit, Michigan 48202 (United States)
  9. California Institute of Technology, Pasadena, California 91125 (United States)
  10. University of California, San Diego, La Jolla, California 92093 (United States)
  11. University of California, Santa Barbara, California 93106 (United States)
  12. Univ. of Colorado, Boulder, Colorado 80309-0390 (United States)
+ Show Author Affiliations
The decay {tau}{sup {minus}}{r_arrow}K{sup {asterisk}{minus}}{eta}{nu}{sub {tau}} has been observed with the CLEOthinspthinspII detector. The K{sup {asterisk}{minus}} is reconstructed in two decay channels, K{sup {asterisk}{minus}}{r_arrow}K{sub S}{pi}{sup {minus}}{r_arrow} {pi}{sup {minus}}{pi}{sup +}{pi}{sup {minus}} and K{sup {asterisk}{minus}}{r_arrow}K{sup {minus}}{pi}{sup 0} . The {eta} is reconstructed from the decay {eta}{r_arrow}{gamma}{gamma} . The measured branching fraction is B({tau}{sup {minus}}{r_arrow}K{sup {asterisk}{minus}} {eta}{nu}{sub {tau}})=(2.9{plus_minus} 0.8{plus_minus}0.4){times}10{sup {minus}4} . We also measure the inclusive branching fractions without requiring the K{sup {asterisk}} resonance, B({tau}{sup {minus}}{r_arrow}K{sub S}{pi}{sup {minus}}{eta}{nu}{sub {tau}})=(1.10 {plus_minus}0.35{plus_minus}0.11){times}10{sup {minus}4} and B({tau}{sup {minus}}{r_arrow}K{sup {minus}}{pi}{sup 0}{eta}{nu}{sub {tau}})=(1.77 {plus_minus}0.56{plus_minus}0.71){times}10{sup {minus}4} . The results indicate that the K{sup {asterisk}{minus}} resonance dominates the K{sub S}{pi}{sup {minus}} mass spectrum. {copyright} {ital 1999} {ital The American Physical Society}
OSTI ID:
300164
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
BRANCHING RATIO
ETA MESONS
KAONS MINUS
MESONS
PARTICLE DECAY
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
RESONANCE PARTICLES
TAU NEUTRINOS
TAU PARTICLES