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Title: Observation of the Decay K{sup +} yields P{sup +} v...

We have observed 1 event consistent with the signature expected of the rare decay of a positive kaon to a positive pion and a neutrino anti-neutrino pair. In the examined momentum region of 211 to 230 MeV/c in the center of mass of the kaon we estimated the backgrounds to be about 0.08 ± 0.03 events. From this observation we estimate the branching ratio to be 4.2 +9.7 -3.5 x 10 -10. In this presentation I will explain the experiment, and the analysis techniques. I will also discuss the expected improvements in the near future from the analysis of new data sets.
Publication Date:
OSTI Identifier:
Report Number(s):
R&D Project: PO-22; B&R Code: KA-04-01; ON: DE00007690
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Conference title not given, Los Angeles, CA, January 5-9, 1999
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
66 PHYSICS; Kaons Plus; Semileptonic Decay; Pions Plus; Neutrinos