| 关于利用库仑光生测量新粒子X(2800)衰变到2γ的宽度ΓX→2γ的建议 |
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| 引用本文： | 程希有,邓质方.关于利用库仑光生测量新粒子X(2800)衰变到2γ的宽度ΓX→2γ的建议[J].物理学报,1977,26(1):9-15. |
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| 作者姓名： | 程希有 邓质方 |
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| 作者单位： | 北京大学物理系,工农兵学员;北京大学物理系,工农兵学员 |
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| 摘 要： | 对于从J(3095)辐射衰变得出的新粒子X(2800),可以从高能γ光子在核子(原子核)上光生微分截面中紧靠0°的实验数据准确定出X→2γ的宽度。讨论了此过程有关的费曼图,分析和估计了其中的耦合常数,计算了能量为50GeV和100GeV的γ光子在质子上(和100GeV的γ光子在铅核上)从0°—3°的微分截面。结果表明,只要ΓX→2γ不是远小于1keV,就可以利用这种库仑光生准确定出它的衰变宽度。
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| 收稿时间： | 1976-09-30 |
A PROPOSED PROCEDURE FOR DETERMINATION THE DECAY WIDTH ΓX→2γ OF THE NEW PARTICLE X(2800) TO 2γ BY COULUMB PHOTOPRODUCTION OF THIS PARTICLE |
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| CHEN XI-YOU and DENG ZHI-FANG.A PROPOSED PROCEDURE FOR DETERMINATION THE DECAY WIDTH ΓX→2γ OF THE NEW PARTICLE X(2800) TO 2γ BY COULUMB PHOTOPRODUCTION OF THIS PARTICLE[J].Acta Physica Sinica,1977,26(1):9-15. |
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| Authors: | CHEN XI-YOU and DENG ZHI-FANG |
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| Abstract: | The 2γ width of X(2.8) which is observed as a decay product of J (3.095) can be determined from high energy Coulumb photoproduction of this particle on nu-cleons and nucleus. The pertinent Feynman diagrams are discussed, the related coupling constants are analized and estimated, and the differential photo-production crossections from 0-3° of 50 and 100 GeV γ on proton (and also 100 GeV γ on the nucleus of lead) are calculated. The results show that if the decay width is not much less than 1 keV, then it can be determined accurately by this Coulumb photo-production measurement. |
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