在KTeV实验中寻找KL→π0π0e+e-衰变。
Search for the KL-->pi 0 pi 0 e+e- decay in the KTeV experiment.
作者信息
Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa R F, Barker A R, Barrio M, Bellantoni L, Bellavance A, Belz J, Bergman D R, Blucher E, Bock G J, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran M D, Corti G, Cox B, Erwin A R, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung Y B, Jejer V, Jensen D A, Kessler R, Kobrak H G E, LaDue J, Lath A, Ledovskoy A, McBride P L, Mikelsons P, Monnier E, Nakaya T, Nelson K S, Nguyen H, O'Dell V, Pordes R, Prasad V, Qi X R, Quinn B, Ramberg E J, Ray R E, Roodman A, Schnetzer S, Senyo K, Shanahan P, Shawhan P S, Shields J, Slater W, Solomey N, Somalwar S V, Stone R L, Swallow E C, Taegar S A, Tesarek R J, Thomson G B, Toale P A, Tripathi A, Tschirhart R, Turner S E, Wah Y W, Wang J, White H B, Whitmore J, Winstein B, Winston R, Yamanaka T, Zimmerman E D
机构信息
University of Wisconsin, Madison, Wisconsin 53706, USA.
出版信息
Phys Rev Lett. 2002 Nov 18;89(21):211801. doi: 10.1103/PhysRevLett.89.211801. Epub 2002 Oct 31.
The recent discovery of a large CP violating asymmetry in KL-->pi+pi-e+e- mode has prompted us to seach for the associated KL-->pi 0 pi 0 e+e- decay mode in the KTeV-E799 experiment at Fermilab. In 2.7 x 10(11) K(L) decays, one candidate event has been observed with an expected background of 0.3 event, resulting in an upper limit for the KL-->pi 0 pi 0 e+e- branching ratio of 6.6 x 10(-9) at the 90% C.L.
最近在KL→π⁺π⁻e⁺e⁻模式中发现了一个大的CP破坏不对称性，这促使我们在费米实验室的KTeV - E799实验中寻找相关的KL→π⁰π⁰e⁺e⁻衰变模式。在2.7×10¹¹次K(L)衰变中，观测到了一个候选事件，预期本底为0.3个事件，在90%的置信水平下，KL→π⁰π⁰e⁺e⁻分支比的上限为6.6×10⁻⁹ 。
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