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arXiv 1001.4528hep-ph
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μ子g-2的差异:新物理学还是相对较轻的希格斯粒子?

The muon g-2 discrepancy: new physics or a relatively light Higgs?

M. Passera, W. J. Marciano, A. Sirlin

摘要:

在简单回顾μ介子g-2的状态后,我们讨论了标准模型预测中的假设误差,这可能解释目前与实验值的差异。似乎都不太可能。特别是,假设在低能量的e+e-碰撞的强子产生截面的增加可以弥合μ子g-2的差异,但它被证明是不可能的,鉴于目前的实验误差估计。然而,如果这被证明是对差异的解释,那么希格斯玻色子质量的95%CL上限被降低到大约135 GeV,这与实验的114.4 GeV 95%CL下限相结合,为这个基本粒子的质量留下了一个狭窄的窗口。

英文摘要:

After a brief review of the muon g-2 status, we discuss hypothetical errors in the Standard Model prediction that might explain the present discrepancy with the experimental value. None of them seems likely. In particular, a hypothetical increase of the hadroproduction cross section in low-energy e+e- collisions could bridge the muon g-2 discrepancy, but it is shown to be unlikely in view of current experimental error estimates. If, nonetheless, this turns out to be the explanation of the discrepancy, then the 95% CL upper bound on the Higgs boson mass is reduced to about 135GeV which, in conjunction with the experimental 114.4GeV 95% CL lower bound, leaves a narrow window for the mass of this fundamental particle.

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