Search for the decay K(L) --> pi(0)&mgr;(+)&mgr;(-)

A Alavi-Harati; IF Albuquerque; T Alexopoulos; M Arenton; K Arisaka; S Averitte; AR Barker; L Bellantoni; A Bellavance; J Belz; R Ben-David; DR Bergman; E Blucher; GJ Bock; C Bown; S Bright; E Cheu; S Childress; R Coleman; MD Corcoran; G Corti; B Cox; MB Crisler; AR Erwin; R Ford; A Glazov

doi:10.1103/PhysRevLett.84.5279

Search for the decay K(L) --> pi(0)&mgr;(+)&mgr;(-)

Phys Rev Lett. 2000 Jun 5;84(23):5279-82. doi: 10.1103/PhysRevLett.84.5279.

Affiliation

¹ University of Arizona, Tucson, Arizona 85721 and University of California at Los Angeles, Los Angeles, California 90095, USA.

PMID: 10990923
DOI: 10.1103/PhysRevLett.84.5279

Abstract

We report on a search for the decay K(L)-->pi(0)&mgr;(+)&mgr;(-) carried out as a part of the KTeV experiment at Fermilab. This decay is expected to have a significant CP violating contribution and a direct measurement will either support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or point to new physics. Two events were observed in the 1997 data with an expected background of 0.87+/-0.15 events, and we set an upper limit B(K(L)-->pi(0)&mgr;(+)&mgr;(-))<3. 8x10(-10) at the 90% confidence level.