Search for the Rare Decay KL→π0e+e−
Year: 2004
Type: article
Abstract: The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}{e}^{\ensuremath{-}}\text{ }$. This mode is expected to have a significant $CP$ violating component. The measurement of its branching ratio could support the standard model or could indicate the existence of new physics. This Letter reports new results from the 1999--2000 data set. One event is observed with an expected background at $0.99\ifmmode\pm\else\textpm\fi{}0.35$ events. We set a limit on the branching ratio of $3.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ at the $90%$ confidence level. Combin\penalty1000\-\allowhyphens{}ing with the previous result based on the data set taken in 1997 yields the final KTeV result: $\mathrm{B}\mathrm{R}({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{e}^{+}{e}^{\ensuremath{-}})<2.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ at $90%$ C.L.
Source: Physical Review Letters
Authors: A. Alavi-Harati, T. Alexopoulos, M. Arenton, R. F. Barbosa, A. R. Barker, M. Barrio, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, C. Bown, S. Bright, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, R. Ford, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, J. Graham, J. Hamm, K. Hanagaki, Y. B. Hsiung, H. Huang, V. Jejer, D. A. Jensen, R. Kessler, H. G. E. Kobrak, K. Kotera, J. LaDue, N. Lai, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, H. Ping, V. Prasad, X. R. Qi, B. Quinn, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, K. Senyo, P. Shanahan, J. Shields, W. Slater, D. E. Smith, N. Solomey, E. C. Swallow, S. A. Taegar, R. J. Tesarek, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, R. F. Zukanovich
Institutions: University of Wisconsin–Madison, University of Virginia, Universidade de São Paulo, University of Colorado Boulder, University of Chicago, Fermi National Accelerator Laboratory, Rice University, University of Arizona, Universidade Estadual de Campinas (UNICAMP), The University of Osaka, University of California San Diego, University of California, Los Angeles, Elmhurst University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2287036628