A search for two body muon decay signals
| Autor: | Bayes, R., Bueno, J., Davydov, Yu. I., Depommier, P., Faszer, W., Fujiwara, M. C., Gagliardi, C. A., Gaponenko, A., Gill, D. R., Grossheim, A., Gumplinger, P., Hasinoff, M. D., Henderson, R. S., Hillairet, A., Hu, J., Koetke, D. D., MacDonald, R. P., Marshall, G. M., Mathie, E. L., Mischke, R. E., Olchanski, K., Olin, A., Openshaw, R., Poutissou, J. -M., Poutissou, R., Selivanov, V., Sheffer, G., Shin, B., Stanislaus, T. D. S., Tacik, R., Tribble, R. E. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.91.052020 |
| Popis: | Lepton family number violation is tested by searching for $\mu^+\to e^+X^0$ decays among the 5.8$\times 10^8$ positive muon decay events analyzed by the TWIST collaboration. Limits are set on the production of both massless and massive $X^0$ bosons. The large angular acceptance of this experiment allows limits to be placed on anisotropic $\mu^+\to e^+X^0$ decays, which can arise from interactions violating both lepton flavor and parity conservation. Branching ratio limits of order $10^{-5}$ are obtained for bosons with masses of 13 - 80 MeV/c$^2$ and with different decay asymmetries. For bosons with masses less than 13 MeV/c$^{2}$ the asymmetry dependence is much stronger and the 90% limit on the branching ratio varies up to $5.8 \times 10^{-5}$. This is the first study that explicitly evaluates the limits for anisotropic two body muon decays. Comment: 7 pages, 5 figures, 2 tables, accepted by PRD |
| Databáze: | arXiv |
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