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arXiv 1504.01103hep-ph
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夸克-反夸克约束势中粲夸克偶氮衰变率

Decay rates of charmonia within a quark-antiquark confining potentials

Smruti Patel, P. C. Vinodkumar, Shashank Bhatnagar

摘要:

本文在非相对论性薛定谔方程的框架下,采用近似的夸克-反夸克间势,研究了粲夸克的光谱和衰变率。利用单胶子交换相互作用的自旋超精细、自旋轨道和张量分量计算了激发态S和少量低激发态P波和D波的光谱。在夸克间距为零和一定的有限间距下,利用所得到的波函数,用常规的Van Royen-Weisskopf公式预言了charmonia态的双γ、双轻子和双胶子衰变率.双伽玛和双轻子衰变的宽度也计算通过将相对论修正的顺序$v^4$内的NRQCD形式主义。我们已经观察到,NRQCD预测与它们的矩阵元素计算在有限的径向分离产生的结果被发现是更好地符合实验值的双伽玛和双轻子衰变。在用Van Royen-Weisskopf公式计算双伽玛和双轻子衰变宽度的情况下,可以看到同样的情况。我们还观察到,考虑了结合能效应后的双胶子衰变宽度与1 S-2S和1 P的实验数据符合得更好。还预测了3S波和2 P波的双胶子衰变宽度。因此,本研究的衰减率清楚地表明了结合能效应的重要性。

英文摘要:

In this work, we investigate the spectroscopy and decay rates of charmonia within the framework of non-relativistic Schrödinger equation by employing an approximate inter quark-antiquark potential. The spin hyperfine, spin-orbit and tensor components of the one gluon exchange interaction are employed to compute the spectroscopy of the excited S states and few low-lying P and D waves. The resultant wave functions at zero inter quark separation as well as some finite separation are employed to predict the di-gamma, di-leptonic and di-gluon decay rates of charmonia states by using the conventional Van Royen-Weisskopf formula. The di-gamma and di-leptonic decay widths are also computed by incorporating the relativistic corrections of order $v^4$ within the NRQCD formalism. We have observed that the NRQCD predictions with their matrix elements computed at finite radial separation yielded results which are found to be in better agreement with experimental value for both di-gamma and di-leptonic decays. The same scenario is seen in the case when di-gamma and di-leptonic decay widths are computed with Van Royen-Weisskopf formula. It is also observed that the di-gluon decay width with the inclusion of binding energy effects are in better agreement with the experimental data available for 1S-2S and 1P. The di-gluon decay width of 3S and 2P waves waves are also predicted. Thus, the present study of decay rates clearly indicates the importance of binding energy effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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