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

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 obt...

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Veröffentlicht in:	arXiv.org 2011-09
Hauptverfasser:	Collaboration, KTeV, 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
Format:	Artikel
Sprache:	eng
Schlagworte:	Confidence intervals Decay Physics - High Energy Physics - Experiment
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Zusammenfassung:	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.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1105.4800