Search for the rare decays K(L)→π0π0μ+μ- and K(L)→π0π0X0→π0π0μ+μ-.

Abouzaid E, Arenton M,Barker A R, Bellantoni L,Blucher E, Bock G J,Cheu E,Coleman R, Corcoran M D,Cox B,Erwin A R,Escobar C O,Glazov A,Golossanov A,Gomes R A,Gouffon P,Hsiung Y B, Jensen D A,Kessler R,Kotera K,Ledovskoy A, McBride P L,Monnier E,Nguyen H,Niclasen R, Phillips D G,Ping H,Ramberg E J,Ray R E, Ronquest M,Santos E,Slater W,Smith D,Solomey N,Swallow E C, Toale P A,Tschirhart R, Velissaris C,Wah Y W,Wang J, White H B, Whitmore J, Wilking M J,Winston R, Worcester E T, Worcester M,Yamanaka T, Zimmerman E D,Zukanovich R F, Null Null

Physical review letters（2011）

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摘要

The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where the X(0) is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c(2). We find no evidence for either decay. We obtain upper limits of Br(K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-)) < 1.0 × 10(-10) and Br(K(L)→π(0)π(0)μ(+)μ(-)) < 9.2 × 10(-11) at the 90% confidence level. This result rules out the pseudoscalar X(0) as an explanation of the HyperCP result under the scenario that the dsX(0) coupling is completely real.

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