1. Measurement of the branching ratio and asymmetry parameter for theΣ+→pγ radiative decay
- Author
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Lang Pengfei, N. P. Kuropatkin, V. T. Grachev, Vincent J Smith, Shi Huanzhang, M. C. Pommot Maia, I. I. Tkatch, N. F. Bondar, A. Morelos, A. V. Dobrovolsky, M. A. Kubantsev, M. Luksys, Yan Jie, V.A. Schegelsky, T. Dubbs, V. L. Golovtsov, Zhao Wenheng, Zheng Shuchen, Alexei Khanzadeev, I. F. Albuquerque, Li Chengze, An.A. Vorobyov, A. S. Denisov, P. Gouffon, Carlos Escobar, E. McCliment, J. R. P. Mahon, M. Foucher, L. N. Uvarov, Dai Lisheng, R.A. Carrigan, P. S. Cooper, Tang Fukun, A. M. F. Endler, C. R. Newsom, H. Gottschalk, Li Yunshan, D Chen, N. K. Terentyev, S. Timm, J. Lach, Zhong Yuanyuan, V. M. Samsonov, and J. Langland
- Subjects
Nuclear physics ,Physics ,Particle physics ,Branching fraction ,media_common.quotation_subject ,Hyperon ,Radiative decay ,Sigma ,High Energy Physics::Experiment ,Asymmetry ,media_common - Abstract
We have measured the branching ratio for the hyperon radiative decay ${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma} using the Fermilab polarized charged hyperon beam. This measurement and our previously published result on the asymmetry parameter in the same decay are part of Fermilab experiment E761. We find B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p\ensuremath{\gamma})/B(${\mathrm{\ensuremath{\Sigma}}}^{+}$\ensuremath{\rightarrow}p${\mathrm{\ensuremath{\pi}}}^{0}$) to be [2.32\ifmmode\pm\else\textpm\fi{}0.11(stat)\ifmmode\pm\else\textpm\fi{}0.10(syst)]\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ with a sample of 31 901 events. The higher statistics and careful attention to systematic uncertainties make these significant improvements over previous measurements. We describe how our measurements were performed and briefly review the theoretical implications of these results.
- Published
- 1995