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Search for the decay K(L) ---> pi0 neutrino anti-neutrino using pi0 ---> e+ e- gamma

Journal Article · · Phys.Rev.D
We report on a search for the decay K_L -> pi^0 nu nubar, carried out as a part of E799-II, a rare K_L decay experiment at Fermilab. Within the Standard Model, the K_L -> pi^0 nu nubar decay is dominated by direct CP violating processes, and thus an observation of the decay implies confirmation of direct CP violation. Due to theoretically clean calculations, a measurement of B(K_L -> pi^0 nu nubar) is one of the best ways to determine the CKM parameter eta. No events were observed, and we set an upper limit B(K_L -> pi^0 nu nubar) < 5.9 times 10^-7 at the 90% confidence level.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
E799-II/KTeV
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1847759
Report Number(s):
FERMILAB-PUB-99-199-E; arXiv:hep-ex/9907014; oai:inspirehep.net:503597
Journal Information:
Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 61
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS