Search for the Rare DecaysKL→π0π0μ+μ−andKL→π0π0X0→π0π0μ+μ−

Autor: E. T. Worcester, P. Gouffon, H. Nguyen, Elliott Cheu, Patricia McBride, M. D. Corcoran, Carlos Escobar, Y. W. Wah, L. Bellantoni, R. F. Zukanovich, E. M. Santos, R. E. Ray, N. Solomey, D. A. Jensen, A. R. Erwin, H. Ping, E. J. Ramberg, W. E. Slater, A. Golossanov, M. Ronquest, E. Abouzaid, A. R. Barker, H. B. White, R. Niclasen, E. Blucher, R. Tschirhart, R. A. Gomes, M. J. Wilking, T. Yamanaka, K. Kotera, E. C. Swallow, C. Velissaris, R. Coleman, Y. B. Hsiung, Richard Kessler, E. D. Zimmerman, Bradley Cox, Alexandre Glazov, J. Whitmore, M. Worcester, D. Smith, Roland Winston, E. Monnier, Alexander Ledovskoy, J. Wang, D. G. Phillips, P. A. Toale, G. J. Bock, Michael Wayne Arenton
Rok vydání: 2011
Předmět:
Zdroj: Physical Review Letters. 107
ISSN: 1079-7114
0031-9007
DOI: 10.1103/physrevlett.107.201803
Popis: The KTeV E799 experiment has conducted a search for the rare decays, ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{X}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, where the ${X}^{0}$ is a possible new neutral boson that was reported by the HyperCP experiment with a mass of $(214.3\ifmmode\pm\else\textpm\fi{}0.5)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. We find no evidence for either decay. We obtain upper limits of $\mathrm{Br}({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{X}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})l1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ and $\mathrm{Br}({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})l9.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ 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 $\overline{d}s{X}^{0}$ coupling is completely real.
Databáze: OpenAIRE
Externí odkaz: