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Hunting for the rare decay K/sup +/. -->. pi. /sup +/. mu. /sup +/. mu. /sup /minus//

Technical Report ·
DOI:https://doi.org/10.2172/6285376· OSTI ID:6285376
This thesis describes an experimental search for the rare decay K/sup +/ ..-->.. ..pi../sup +/..mu../sup +/..mu../sup /minus//. The data were accumulated during two weeks of running Brookhaven AGS experiment E787. Offline event reconstruction reduces the sample to three candidates. If one assumes all three events are background, then an upper limit of 2.1 /times/ 10/sup /minus/7/ is set at the 90% confidence level. Two of these events cannot be explained in terms of the major background channel. Assuming the background is sufficiently understood, the interpretation of these two candidates as genuine K/sup +/ ..-->.. ..pi../sup +/..mu../sup +/..mu../sup /minus// events results in a measured branching ratio of (6.1 +- 4) /times/ 10/sup /minus/8/. An upper limit on the process K/sup +/ ..-->.. ..pi../sup +/H, H ..-->.. ..mu../sup +/..mu../sup /minus// is found as a function of Higgs mass in the interval 2m/sub mu/ less than or equal to M/sub H/ less than or equal to 320 MeV. This limit never exceeds 1.5 /times/ 10 /sup /minus/7/ at the 90% confidence level. We also set an upper limit on the decay mode K/sup +/ ..-->.. ..mu../sup +/..nu mu../sup +/..mu../sup /minus// of 3.7 /times/ 10/sup /minus/7/ at the 90% confidence level. This is the first experimental limit set on this process. 34 refs.
Research Organization:
Princeton Univ., NJ (USA). Dept. of Physics
DOE Contract Number:
AC02-76ER03072
OSTI ID:
6285376
Report Number(s):
DOE/ER/03072-49; ON: DE89011592
Country of Publication:
United States
Language:
English

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Related Subjects

645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DECAY
DETECTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HIGGS BOSONS
KAONS
KAONS PLUS
LEPTONS
MASS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
MUONS
PARTICLE DECAY
PARTICLE MODELS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
RADIATION DETECTORS
REST MASS
SHOWER COUNTERS
STANDARD MODEL
STRANGE MESONS
STRANGE PARTICLES
UNIFIED GAUGE MODELS