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arXiv 1006.2685hep-ph
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用QCD测定重夸克偶素电磁衰变率的改进

Improved determination of inclusive electromagnetic decay ratios of heavy quarkonium from QCD

Yuichiro Kiyo, Antonio Pineda, Adrian Signer

摘要:

我们考虑了一种不同的功率计数势NRQCD通过纳入静态势正好在首阶哈密顿量。在这个新方案中,我们计算了相对论修正对电磁衰变率的影响。这种新的功率计数的效果被发现是大的(即使是顶部)。我们生成$η_b$衰减为两个光子的更新值。该方案还使粲偶素衰变率的弱耦合计算值与实验值一致。

英文摘要:

We consider a different power counting in potential NRQCD by incorporating the static potential exactly in the leading order Hamiltonian. We compute the leading relativistic corrections to the inclusive electromagnetic decay ratios in this new scheme. The effect of this new power counting is found to be large (even for top). We produce an updated value for the $η_b$ decay to two photons. This scheme also brings consistency between the weak coupling computation and the experimental value of the charmonium decay ratio.

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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