Search for the Rare Decays KL→π0π0μ +μ- and KL→π0π0X0→π0π 0μ+μ-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, 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. KoteraA. Ledovskoy, P. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, 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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The KTeV E799 experiment has conducted a search for the rare decays, K L→π0π0μ+μ- and K L→π0π0X0→π0π0μ+μ-, where the X0 is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3±0.5)MeV/c2. We find no evidence for either decay. We obtain upper limits of Br(KL→π0π0X0→ π0π0μ+μ-)<1.0×10-10 and Br(KL→π0π0μ+μ-)<9. 2×10-11 at the 90% confidence level. This result rules out the pseudoscalar X0 as an explanation of the HyperCP result under the scenario that the d̄sX0 coupling is completely real.

Original languageEnglish (US)
Article number201803
JournalPhysical review letters
Issue number20
StatePublished - Nov 9 2011
Externally publishedYes


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