泛变Yukawa耦合的约束：从类SM到疏费米
Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic
摘要：
通过一般的正标度因子（$F_{Yu}$）改变标准模型（SM）费米子汤川耦合，研究了强子对撞机上希格斯玻色子玻色子搜寻的唯象拟合.指出Higgs产生截面及其与$F_{Yu}$的衰变分支比可以通过$F_{Yu}$反向变化，使它们的乘积几乎不变.因此，我们的方案和SM希格斯粒子在包容的$H\to γγ$通道中是不可区分的。当前对$H\to b\bar{b}/ττ$通道中的Yukawa直接耦合强度的测量不够精确，无法固定比例因子$F_{Yu}$。最有希望的是矢量玻色子融合通道，其中CMS已经观察到对Yukawa耦合的可能抑制效果。此外，通过对SM Yukawa耦合引入抑制因子$F_{Yu}\sim1/2$，可以使实验数据的全局$χ^2$拟合得到最优值。
英文摘要：
Varying the Standard Model (SM) fermion Yukawa couplings universally by a generic positive scale factor ($F_{Yu}$), we study the phenomenological fit to the current available experimental results for the Higgs boson search at hadron colliders. We point out that the Higgs production cross section and its decay branching ratio to $γγ$ can be varied oppositely by $F_{Yu}$ to make their product almost invariant. Thus, our scenario and the SM Higgs are indistinguishable in the inclusive $H\to γγ$ channel. The current measurements on direct Yukawa coupling strength in the $H\to b\bar{b}/ττ$ channel are not precise enough to fix the scale factor $F_{Yu}$. The most promising is the vector-boson-fusion channel in which the CMS has already observed possible suppression effect on the Yukawa couplings. Further more, the global $χ^2$ fit of the experimental data can get the optimal value by introducing a suppression factor $F_{Yu}\sim1/2$ on the SM Yukawa couplings.
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