标题： 希格斯质量界限区分电弱对称性破缺模型 显示英文标题

标题： Higgs Mass Bounds Separate Models of Electroweak Symmetry Breaking

摘要： 真空稳定性在标准模型(SM)中对希格斯玻色子质量设定了下限。 相反，在超对称(SUSY)模型中可以计算出最轻希格斯质量的上限。 每个限制的主要不确定性是顶夸克质量的值，这可能现在由最近的CDF结果确定。 我们研究了这些界限不重叠的可能性，并发现(i)在SM和最小超对称标准模型(MSSM)之间，以及在SM和最小加单态超对称模型[(M+1)SSM]之间，当后者独立标量自耦合微弱或$\tan\beta$参数较大时，在$m_t\sim 160$GeV处会出现质量间隙；随着$m_t$的增加，这个间隙会变大；(ii)在SM和MSSM的界限之间，对于$m_t$的更小值，当$\tan\beta$值为$\sim 1$--2时（在超对称大统一理论中首选），没有重叠。 因此，如果新的顶夸克质量测量结果仍然有效，对第一个希格斯质量的测量将有助于排除SM或MSSM/(M+1)SSM的希格斯场。 此外，我们讨论了在具有扩展希格斯场的SUSY模型以及在具有强相互作用希格斯场的模型中，最轻希格斯质量的上限。 最后，我们评论了这些模型中最轻希格斯粒子的发现潜力。 显示英文摘要

摘要： Vacuum stability implies a lower limit on the mass of the higgs boson in the Standard Model (SM). In contrast, an upper limit on the lightest higgs mass can be calculated in supersymmetric (susy) models. The main uncertainty in each limit is the value of the top mass, which may now be fixed by the recent CDF result. We study the possibility that these bounds do not overlap, and find that (i) a mass gap emerges at $m_t\sim 160$ GeV between the SM and the Minimal Susy Standard Model (MSSM); and between the SM and the Minimal plus Singlet Susy Model [(M+1)SSM] if the independent scalar self--coupling of the latter is perturbatively small or if the $\tan\beta$ parameter is large; this gap widens with increasing $m_t$; (ii) there is no overlap between the SM and the MSSM bounds at even smaller values of $m_t$ for the $\tan\beta$ value ($\sim 1$--2) preferred in Supersymmetric Grand Unified Theories. Thus, if the new top mass measurement remains valid, a measurement of the first higgs mass will serve to exclude either the SM or MSSM/(M+1)SSM higgs sectors. In addition, we discuss the upper bound on the lightest higgs mass in susy models with an extended higgs sector, and in models with a strongly interacting higgs sector. Finally, we comment on the discovery potential for the lightest higgses in these models.