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

Authors :: Abouzaid E
Arenton M
Barker AR
Bellantoni L
Blucher E
Bock GJ
Cheu E
Coleman R
Corcoran MD
Cox B
Erwin AR
Escobar CO
Glazov A
Golossanov A
Gomes RA
Gouffon P
Hsiung YB
Jensen DA
Kessler R
Kotera K
Ledovskoy A
McBride PL
Monnier E
Nguyen H
Niclasen R
Phillips DG 2nd
Ping H
Ramberg EJ
Ray RE
Ronquest M
Santos E
Slater W
Smith D
Solomey N
Swallow EC
Toale PA
Tschirhart R
Velissaris C
Wah YW
Wang J
White HB
Whitmore J
Wilking MJ
Winston R
Worcester ET
Worcester M
Yamanaka T
Zimmerman ED
Zukanovich RF
Source :: Physical review letters [Phys Rev Lett] 2011 Nov 11; Vol. 107 (20), pp. 201803. Date of Electronic Publication: 2011 Nov 09.
Publication Year :: 2011
Abstract: 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.