Alavi-Harati A, Albuquerque IF, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A
University of Arizona, Tucson, Arizona 85721 and University of California at Los Angeles, Los Angeles, California 90095, USA.
Phys Rev Lett. 2000 Jun 5;84(23):5279-82. doi: 10.1103/PhysRevLett.84.5279.
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.
我们报告了作为费米实验室KTeV实验一部分而进行的对K(L)→π(0)μ(+)μ(-)衰变的搜索。预计这种衰变会有显著的CP破坏贡献，直接测量将要么支持CP破坏的卡比博-小林-益川机制，要么指向新物理。在1997年的数据中观测到了两个事例，预期本底为0.87±0.15个事例，我们在90%置信水平下设定了一个上限B(K(L)→π(0)μ(+)μ(-))<3.8×10^(-10)。
