Abstract
We study the implication of the LHC Higgs search results on the Type II Two Higgs-Doublet Model. In particular, we explore the scenarios in which the observed 126 GeV Higgs signal is interpreted as either the light CP-even Higgs h 0 or the heavy CP-even Higgs H 0. Imposing both theoretical and experimental constraints, we analyze the surviving parameter regions in m H (m h ), m A , m H ±, tan β and sin(β − α). We further identify the regions that could accommodate a 126 GeV Higgs with cross sections consistent with the observed Higgs signal. We find that in the h 0-126 case, we are restricted to narrow regions of sin(β − α) ≈ ±1 with tan β up to 4, or an extended region with 0.55 < sin(β − α) < 0.9 and 1.5 < tan β < 4. The values of m H , m A and m H ±, however, are relatively unconstrained. In the H 0-126 case, we are restricted to a narrow region of sin(β − α) ~ 0 with tan β up to about 8, or an extended region of sin(β − α) between −0.8 to −0.05, with tan β extended to 30 or higher. m A and m H ± are nearly degenerate due to Δρ constraints. Imposing flavor constraints shrinks the surviving parameter space significantly for the H 0-126 case, limiting tan β ≲ 10, but has little effect in the h 0-126 case. We also investigate the correlation between γγ, V V and bb/ττ channels. γγ and V V channels are most likely to be highly correlated with γγ: V V ~ 1 for the normalized cross sections.
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Coleppa, B., Kling, F. & Su, S. Constraining type II 2HDM in light of LHC Higgs searches. J. High Energ. Phys. 2014, 161 (2014). https://doi.org/10.1007/JHEP01(2014)161
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DOI: https://doi.org/10.1007/JHEP01(2014)161