| γ Radiative Decays to Light Quark Jets and Color Octet Mechanism |
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| 作者姓名： | GAO Ying-Jia ZHANG Yu-Jie CHAO Kuang-Ta |
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| 作者单位： | [1]Department of Physics, Peking Universlty, Beijlng 100871, China [2]China Center of Advanced Science and Technology （World Laboratory）, Beijing 100080, China |
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| 基金项目： | The project supported in part by National Natural Science Foundation of China under Grant No. 10421503 and the Key Project of the Ministry of Education under Grant No. 305001, and the Research Found of Doctorial Programs of Higher Education of China. We thank E. Berger for bringing their earlier work on inelastic photoproduction of T （Ref. [12]） to our attention. We would also like to thank Ce Meng for valuable discussions. |
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| 摘 要： | We study radiative decays of T to light quark jets in nonrelativistic QCD by taking both the color singlet and color octet b^-b operators into consideration. The cut for quark jet energy and cut for the angle between two quark jets are introduced. The sensitivity to the soft and collinear singularities in the loop integrals are greatly reduced by these cuts. With the jet energy cut of about 1 GeV, and the jet angle cut of about 36°, the branching ratio for γ→ rq^- is found to be 8.2 × 10^-4 from color singlet contributions. The color octet contributions could be much larger than that of color singlet, depending on the estimate of the color octet matrix elements. This process may provide a new test for the color octet mechanism in nonrelativistic QCD.
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| 关 键 词： | γ射线衰变 轻夸克喷注 色八重态 机理 胶子 |
| 收稿时间： | 2006-06-16 |
| 修稿时间： | 2006-06-16 |
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