Search for the Rare Decays $K_L \\to \\pi^0\\pi^0\\mu^+\\mu^-$ and $K_L \\to \\pi^0\\pi^0 X^0\\to \\pi^0\\pi^0\\mu^+\\mu^-$
Journal
Physics Review Letters
Journal Volume
107
Pages
201803
Date Issued
2011-05
Author(s)
Abouzaid, E.
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.
Type
journal article