Exclusive eta(b) decay to double J / psi at next-to-leading order in alpha(s)
Exclusive eta(b) decay to double J / psi at next-to-leading order in alpha(s)
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DOI：
10.1016/j.physletb.2008.10.063
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发表时间：
2008-08
影响因子：
4.4
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文献类型：
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在非相对论QCD(NRQCD)因式分解框架下，我们计算了强耦合常数和魅力夸克相对速度下的排他衰变过程{eta}{subb}{派生}J/{psi}J/{psi}到次前级。结果发现，这种对振幅的新贡献在量级上与先前计算的相对论校正片相当，但相差约90度。计入这一新贡献将大大提高对B({eta}{subb}{殖利率}J/{psi}J/{psi})的预测，从而使即将到来的大型强子对撞机实验中发现这条干净的强子衰变通道的潜力变得光明。
Within the non-relativistic QCD (NRQCD) factorization framework, we calculate the exclusive decay process {eta}{sub b}{yields}J/{psi}J/{psi} to next-to-leading order in the strong coupling constant, and, at leading order, in the charm quark relative velocity. It is found that this new contribution to the amplitude is comparable in magnitude to the previously calculated relativistic correction piece, but differs by a phase of about 90 deg. Including this new contribution will increase the previous prediction of B({eta}{sub b}{yields}J/{psi}J/{psi}) substantially, thus brightening the discovery potential of this clean hadronic decay channel of {eta}{sub b} in the forthcoming LHC experiment.