تقرير
Study of the rare hyperon decay Omega \to Xi \pi^+ \pi^-
| العنوان: | Study of the rare hyperon decay Omega \to Xi \pi^+ \pi^- |
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| المؤلفون: | HyperCP Collaboration, Kamaev, O., Solomey, N., Burnstein, R. A., Chakravorty, A., Chen, Y. C., Choong, W. -S., Clark, K., Dukes, E. C., Durandet, C., Felix, J., Fu, Y., Gidal, G., Gustafson, H. R., Holmstrom, T., Huang, M., James, C., Jenkins, C. M., Jones, T. D., Kaplan, D. M., Longo, M. J., Lu, L. C., Luebke, W., Luk, K. -B., Nelson, K. S., Park, H. K., Perroud, J. -P., Rajaram, D., Rubin, H. A., Volk, J., White, C. G., White, S. L., Zyla, P. |
| المصدر: | Phys.Lett.B693:236-240,2010 |
| سنة النشر: | 2010 |
| المجموعة: | High Energy Physics - Experiment Nuclear Experiment |
| مصطلحات موضوعية: | High Energy Physics - Experiment, Nuclear Experiment |
| الوصف: | We report a new measurement of the decay \Omega^- \to \Xi^- \pi^+ \pi^- with 76 events and a first observation of the decay \Omega^+ \to \Xi^+ \pi^+ \pi^- with 24 events, yielding a combined branching ratio (3.74 ^{+0.67}_{-0.56}) \times 10^{-4}. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B(\Omega^- \to \Xi^- \pi^+ \pi^-)=4.04^{+0.83}_{-0.71} \times 10^{-4} and B(\Omega^+ \to \Xi^+ \pi^+ \pi^-)=3.15^{+1.12}_{-0.89} \times 10^{-4}. Contrary to theoretical expectation, we see little evidence for the decays \Omega^- \to \Xi_{1530}^{*0} \pi^- and \Omega^+ \to \Xi_{1530}^{*0} \pi^+ and place a 90% C.L. upper limit on the combined branching ratio B(\Omega^-(\Omega^+) \to \Xi^{*0}_{1530}(\Xi^{*0}_{1530}) \pi^\mp)<7.0 \times 10^{-5}. Comment: 6 pages, 5 figures, to be published in Phys. Lett. B |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physletb.2010.08.037 |
| URL الوصول: | http://arxiv.org/abs/1008.4405 |
| رقم الأكسشن: | edsarx.1008.4405 |
| قاعدة البيانات: | arXiv |
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