1. Search for $\pi^0 \to \nu_{\mu}\bar\nu_{\mu}$ Decay in LSND
- Author
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Auerbach, L. B., Burman, R. L., Caldwell, D. O., Church, E. D., Cochran, A. K., Donahue, J. B., Fazely, A. R., Garvey, G. T., Gunasingha, R. M., Imlay, R. L., Kahrimanis, G., Louis, W. C., Majkic, R., Malik, A., McIlhany, K. L., Metcalf, W. J., Mills, G. B., Rupnik, D., Sandberg, V. D., Smith, D., Somodi, R. F., Stancu, I., Strossman, W. D., Sung, M., Tayloe, R., VanDalen, G. J., Vernon, W., Wadia, N., White, D. H., Yellin, S., and Yi, H.
- Subjects
High Energy Physics - Experiment - Abstract
We observe a net beam-excess of $8.7 \pm 6.3$ (stat) $\pm 2.4$ (syst) events, above 160 MeV, resulting from the charged-current reaction of $\nu_{\mu}$ and/or $\bar\nu_{\mu}$ on C and H in the LSND detector. No beam related muon background is expected in this energy regime. Within an analysis framework of $\pi^0 \to \nu_{\mu}\bar\nu_{\mu}$, we set a direct upper limit for this branching ratio of $\Gamma(\pi^0 \to \nu_\mu \bar\nu_\mu) / \Gamma(\pi^0 \to all) < 1.6 \times 10^{-6}$ at 90% confidence level., Comment: 4 pages, 4 figures
- Published
- 2003
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