Improved Branching Ratio Measurement for the Decay K{sup 0}{sub L} {yields} {mu}{sup +} {mu}{sup -}

Journal Article · Mon Feb 14 04:00:00 EST 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.84.1389· OSTI ID:20215541

Ambrose, D ^[1]; Arroyo, C ^[2]; Bachman, M ^[3]; Connor, D ^[3]; Eckhause, M ^[4]; Graessle, S ^[1]; Hancock, A D ^[4]; Hartman, K ^[2]; Hebert, M ^[2]; Hoff, C H ^[4]

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1. University of Texas, Austin, Texas 78712 (United States)
2. Stanford University, Stanford, California 94305 (United States)
3. University of California, Irvine, California 92697 (United States)
4. College of William and Mary, Williamsburg, Virginia 23187 (United States)

We report results from Experiment 871, performed at the BNL AGS, of a measurement of the branching ratio K{sup 0}{sub L}{yields}{mu}{sup +}{mu}{sup -} with respect to the CP -violating mode K{sup 0}{sub L}{yields}{pi}{sup +}{pi}{sup -} . This experiment detected over 6200 candidate {mu}{sup +}{mu}{sup -} events, a factor of 6 more than that seen in all previous measurements combined. The resulting branching ratio {gamma}(K{sup 0}{sub L}{yields}{mu}{sup +} {mu}{sup -})/{gamma}(K{sup 0}{sub L}{yields}{pi}{sup +}{pi}{sup -}) (3.474{+-}0.057)x10{sup -6} leads to a branching fraction B(K{sup 0}{sub L}{yields}{mu}{sup +}{mu}{sup -})=(7.18{+-}0.17)x10{sup -9} , which is consistent with the current world average, and reduces the uncertainty in this decay mode by a factor of 3. (c) 2000 The American Physical Society.

• OSTI ID: 20215541
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 84; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CP INVARIANCE
EXPERIMENTAL DATA
KAONS NEUTRAL
MUONS MINUS
MUONS PLUS
PARTICLE DECAY
PIONS MINUS
PIONS PLUS