Search for lepton flavor violation in K+ decays into a charged pion and two leptons.
/ Authors
R. Appel, G. Atoyan, B. Bassalleck, D. Bergman, N. Cheung, S. Dhawan, H. Do, J. Egger, S. Eilerts, H. Fischer
and 18 more authors
W. Herold, V. Issakov, H. Kaspar, D. Kraus, D. Lazarus, P. Lichard, J. Lowe, J. Lozano, H. Ma, W. Majid, W. Menzel, S. Pislak, A. Poblaguev, P. Řehák, A. Sher, J. Thompson, P. Truöl, M. Zeller
/ Abstract
A search for lepton flavor violating decays, K+ --> mu+ mu+ pi-, K+ --> e+ e+ pi-, K+ --> pi+ e+ mu-, K+ --> mu+ e+ pi-, and pi0 --> e+ mu-, was performed using the data collected in Experiment E865 at the Brookhaven Alternating Gradient Synchrotron. No signal was found in any of the decay modes. At the 90% confidence level, the branching ratios are less than 3.0x10(-9), 6.4x10(-10), 5. 2x10(-10), 5.0x10(-10), and 3.4x10(-9), respectively.
Journal: Physical review letters