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arXiv 0901.4318hep-ph
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Stoponium湮没衰变的辐射修正

Radiative corrections to stoponium annihilation decays

Stephen P. Martin, James E. Younkin

摘要:

超对称中较轻的顶夸克可以存活足够长的时间,形成强子束缚态,如果它没有运动学上允许的保存味道的两体衰变。在这种情况下,标量旋偶素可以在欧洲核子研究中心的大型强子对撞机上通过其双光子衰变模式观测到,从而实现对顶夸克质量的独特精确测量。信号的可行性主要取决于双光子的分支比。我们计算了次至首阶QCD辐射修正,对强子、光子和希格斯标量玻色子的自旋湮没衰变进行了修正。我们发现,这些修正的效果是显着降低预测的分支比的重要双光子通道。我们还发现了一个大大改善的重正化尺度依赖的双光子分支比预测。

英文摘要:

The lighter top squark in supersymmetry can live long enough to form hadronic bound states if it has no kinematically allowed two-body decays that conserve flavor. In this case, scalar stoponium may be observable through its diphoton decay mode at the CERN Large Hadron Collider, enabling a uniquely precise measurement of the top-squark mass. The viability of the signal depends crucially on the branching ratio to diphotons. We compute the next-to-leading order QCD radiative corrections to stoponium annihilation decays to hadrons, photons, and Higgs scalar bosons. We find that the effect of these corrections is to significantly decrease the predicted branching ratio to the important diphoton channel. We also find a greatly improved renormalization-scale dependence of the diphoton branching ratio prediction.

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