Search for the Rare Decays KL->pi0pi0mu+mu- and KL->pi0pi0X0->pi0pi0mu+mu-

KTeV Collaboration: E. Abouzaid , M. Arenton , A.R. Barker , L. Bellantoni , E. Blucher , G.J. Bock , E. Cheu , R. Coleman

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

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classification ✦ hep-ex

keywords pi0pi0mupi0pi0x0-decaysexperimenthypercprareresultsearch

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The KTeV E799 experiment has conducted a search for the rare decays KL->pi0pi0mu+mu- and KL->pi0pi0X0->pi0pi0mu+mu-, where the X0 is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 pm 0.5) MeV/c^{2}. We find no evidence for either decay. We obtain upper limits of Br(KL->pi0pi0X0->pi0pi0mu+mu-) < 1.0 x 10^{-10} and Br(KL->pi0pi0mu+mu-) < 9.2 x 10^{-11} at the 90% confidence level. This result rules out the pseudoscalar X0 as an explanation of the HyperCP result under the scenario that the \bar{d}sX0 coupling is completely real.

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Search for the Rare Decays KL->pi0pi0mu+mu- and KL->pi0pi0X0->pi0pi0mu+mu-

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