Search for the Lepton-Number-Violating Decay Ξ- p μ- μ-
HyperCP Collaboration, D. Rajaram, R. A. Burnstein, A. Chakravorty, Y. C. Chen, W. -S. Choong, K. Clark, E. C. Dukes, C. Durandet, J. Felix, Y. Fu, G. Gidal, H. R. Gustafson, T. Holmstrom, M. Huang, C. James, C. M. Jenkins, T. D. Jones, D. M. Kaplan, M. J. Longo, L. C. Lu, W. Luebke, K. -B. Luk, K. S. Nelson, H. K. Park, J. -P. Perroud, H. A. Rubin, J. Volk, C. G. White, S. L. White, P. Zyla
Abstract
A sensitive search for the lepton-number-violating decay Ξ- p μ-μ- has been performed using a sample of 109 Ξ- hyperons produced in 800 GeV/c p-Cu collisions. We obtain B(Ξ- p μ-μ-)< 4.0× 10-8 at 90% confidence, improving on the best previous limit by four orders of magnitude.
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