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First Observations of {Upsilon}(1S) {r_arrow} {gamma}{pi}{sup +}{pi}{sup {minus}} and {Upsilon}(1S) {r_arrow} {gamma}{pi}{sup 0}{pi}{sup 0}

Journal Article · · Physical Review Letters
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  1. Ohio State University, Columbus, Ohio 43210 (United States)
  2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
  3. Purdue University, West Lafayette, Indiana 47907 (United States)
  4. University of Rochester, Rochester, New York 14627 (United States)
  5. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)
  6. Southern Methodist University, Dallas, Texas 75275 (United States)
  7. Syracuse University, Syracuse, New York 13244 (United States)
  8. Vanderbilt University, Nashville, Tennessee 37235 (United States)
  9. Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States)
  10. Wayne State University, Detroit, Michigan 48202 (United States)
  11. California Institute of Technology, Pasadena, California 91125 (United States)
  12. University of California, San Diego, La Jolla, California 92093 (United States)
+ Show Author Affiliations

We report on a study of exclusive radiative decays of the {Upsilon}(1S) resonance collected with the CLEOthinspthinspII detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays {Upsilon}(1S){r_arrow}{gamma}{pi}{sup +}{pi}{sup {minus}} and {Upsilon}(1S){r_arrow}{gamma}{pi}{sup 0}{pi}{sup 0} . For the dipion mass regime m{sub {pi}{pi}}{gt}1.0 GeV , we obtain B({Upsilon}(1S){r_arrow}{gamma}{pi}{sup +}{pi}{sup {minus}})=(6.3{plus_minus}1.2{plus_minus} 1.3){times}10{sup {minus}5} and B({Upsilon}(1S){r_arrow}{gamma}{pi}{sup 0}{pi}{sup 0})=(1.7{plus_minus}0.6{plus_minus} 0.3){times}10{sup {minus}5} . {copyright} {ital 1999} {ital The American Physical Society }

OSTI ID:
300165
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
CESR STORAGE RING
PHOTOPRODUCTION
PIONS MINUS
PIONS NEUTRAL
PIONS PLUS
RADIATIVE DECAY
RESONANCE PARTICLES