标准模型的可能命运
The Probable Fate of the Standard Model
摘要：
利用重整化群将标准模型外推到高尺度，根据希格斯玻色子的质量，出现了三种可能性：如果希格斯质量足够大，希格斯自耦合可能会爆炸，产生一些新的非微扰动力学;如果希格斯质量很小，标准模型的有效势可能会显示出不稳定性;或者标准模型可能一直存在到希格斯质量的中间范围的普朗克尺度。后一种情况不一定要求在任何时候都是稳定的，但包括尚未衰变的亚稳态真空的可能性。我们评估这些可能性的相对似然性，在一个全球性的基础上，适合使用Gfitter包的标准模型。这使用了直接从LEP和现在的Tevatron的希格斯搜索中获得的关于希格斯质量的信息，以及间接从精确的电弱数据中获得的信息。我们发现，“爆炸”的情况下，是不利的99%的置信水平（96%没有Tevatron排除），而“生存”和可能的“亚稳态”的情况下仍然是合理的。未来对希格斯玻色子质量的测量可能会揭示标准模型的命运。
英文摘要：
Extrapolating the Standard Model to high scales using the renormalisation group, three possibilities arise, depending on the mass of the Higgs boson: if the Higgs mass is large enough the Higgs self-coupling may blow up, entailing some new non-perturbative dynamics; if the Higgs mass is small the effective potential of the Standard Model may reveal an instability; or the Standard Model may survive all the way to the Planck scale for an intermediate range of Higgs masses. This latter case does not necessarily require stability at all times, but includes the possibility of a metastable vacuum which has not yet decayed. We evaluate the relative likelihoods of these possibilities, on the basis of a global fit to the Standard Model made using the Gfitter package. This uses the information about the Higgs mass available directly from Higgs searches at LEP and now the Tevatron, and indirectly from precision electroweak data. We find that the `blow-up' scenario is disfavoured at the 99% confidence level (96% without the Tevatron exclusion), whereas the `survival' and possible `metastable' scenarios remain plausible. A future measurement of the mass of the Higgs boson could reveal the fate of the Standard Model.
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