LSS小希格斯粒子中的2HDM突现：来自Flavor和电弱物理的思考
Emergent 2HDM in LSS Little-Higgs: Musings from Flavor and Electroweak Physics
摘要：
Low，Skiba和Smith（LSS）提出的含$SU(6)/Sp(6)$的小Higgs模型的低能有效理论（PDMATHABMMTeV）呈现出双Higgs二重态（2HDM）结构。对称性决定了有趣的汤川模式，转化为费米子与希格斯双重态的非平凡耦合。标量与费米子的耦合会引起变味中性流（FCNC），而FCNC受到BR $(B\rightarrow X_sγ)$、$B_s - \bar{B}_s$混合等变味物理观测量的约束。大型强子对撞机（LHC）对$Z b \bar{b}$顶点、顶点和Higgs质量的精确测量以及其他Higgs耦合测量也对LSS模型施加了严格的限制。直接LHC搜索结果的超越标准模型（BSM）的粒子也强加了限制的质量。我们通过在多维参数空间中的随机扫描来探测LSS模型。我们观察到，与一般的2HDM方案相反，从LSS模型中涌现的2HDM较少受到风味数据和$Z b \bar{b}$测量的约束，但受到LHC中电弱（EW）搜索的严重约束。从味数据和$Z b \bar{b}$，我们发现，带电的希格斯质量是放松与$\tanβ$被限制到$0.5-5$，而带电的希格斯质量被推到大于1 TeV，随着$\tanβ$被进一步限制到$< 3$时，LHC边界纳入。
英文摘要：
The low energy effective theory ($\sim$ TeV) of the little-Higgs model with $SU(6)/Sp(6)$, as proposed by Low, Skiba and Smith (LSS), exhibits a two-Higgs doublet model (2HDM) structure. The symmetry dictates interesting Yukawa patterns, translating to non-trivial fermion couplings with both of the Higgs doublets. The couplings of the scalars with the fermions can induce flavor changing neutral currents (FCNC), which get constraints from flavor physics observables such as BR$(B\rightarrow X_sγ)$, $B_s - \bar{B}_s$ mixing etc. The precision measurement of $Z b \bar{b}$ vertex, the top and Higgs mass along with other Higgs coupling measurements at the Large Hadron Collider (LHC) also enforce severe restrictions on the LSS model. Direct LHC search results of beyond the Standard Model (BSM) particles also impose bounds on the masses. We probe the LSS model in view of the above constraints through a random scan in the multi-dimensional parameter space. We observe, on contrary to the general 2HDM scenario, the emergent 2HDM from the LSS model is less constrained from the flavor data and the $Z b \bar{b}$ measurement but is severely constrained form the electroweak (EW) searches at the LHC. From the flavor data and $Z b \bar{b}$, we find that the charged Higgs mass is relaxed with $\tanβ$ being restricted to $0.5-5$, whereas the charged Higgs mass is pushed to larger than 1 TeV along with $\tanβ$ being further restricted to $< 3$ when the LHC bounds are incorporated.
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