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Light Higgs bosons in two-Higgs-doublet models

Jeremy Bernon, John F. Gunion, Yun Jiang, and Sabine Kraml
Phys. Rev. D 91, 075019 – Published 24 April 2015
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  • INTRODUCTION
  • mh∼125  GeV CASE
  • mH∼125  GeV CASE
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We explore the possibilities in two-Higgs-doublet models of type I and type II for Higgs states with mass below about 60 GeV, i.e. less than half of the ∼125  GeV mass of the observed SM-like Higgs boson. We identify the latter as either the lighter or the heavier CP-even state, h or H, and employ scans of the two-Higgs-doublet model parameter space taking into account all relevant theoretical and experimental constraints, including the most up-to-date Higgs signal strength measurements. We find that, in both type I and type II models, such light Higgs states are phenomenologically viable and can lead to interesting signatures. Part of the relevant parameter space may be testable with the existing 8 TeV LHC data, e.g. by looking for direct production of the light state via gg fusion or bb¯ associated production using its τ+τ− and μ+μ− decays at low invariant mass.

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    • Received 23 January 2015

    DOI:https://doi.org/10.1103/PhysRevD.91.075019

    © 2015 American Physical Society

    Authors & Affiliations

    Jeremy Bernon1,*, John F. Gunion2,†, Yun Jiang2,‡, and Sabine Kraml1,§

    • 1Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Avenue des Martyrs, F-38026 Grenoble, France
    • 2Department of Physics, University of California, Davis, California 95616, USA

    • *jeremy.bernon@lpsc.in2p3.fr
    • †jfgunion@ucdavis.edu
    • ‡yunjiang@ucdavis.edu
    • §sabine.kraml@lpsc.in2p3.fr

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    Issue

    Vol. 91, Iss. 7 — 1 April 2015

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    Images

    • Figure 1
      Figure 1

      For sin(β−α)=1, we show the regions of m12 vs tanβ parameter space consistent with perturbativity for various mH values (see the in-figure color code in the lower-left corner). Also shown are the narrow regions for which BR(h→AA)<0.3, assuming h is the SM-like Higgs at 125 GeV with a total decay width of 4.07 MeV, for the indicated values of mA shown in the upper-right corner. The figure applies to both the type I and type II 2HDMs. The perturbatively acceptable region also extends to m122<0, but this region is not plotted since Eq. (8) would give large |ghAA| and, therefore, large BR(h→AA) if m122 were negative.

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    • Figure 2
      Figure 2

      Phenomenologically viable points with mA≤mh/2 in the m12 vs cos(β+α) plane, for 2HDM type I (left) and type II (right). The cyan points have sin(β−α)∼1, cos(β−α)>0, and modest m12, as for the sin(β−α)=1 allowed region seen in Fig. 1, while the orange points have sin(β+α)∼1, small cos(β+α)<0, and tanβ>5.

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    • Figure 3
      Figure 3

      Same as Fig. 2 but in the tanβ vs sinα plane. The solid black and purple lines indicate sin(β−α)=1 and sin(β+α)=1, respectively. The dashed black (purple) lines are isocontours of values of sin(β−α) (sin(β+α)) as indicated on the plots.

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    • Figure 4
      Figure 4

      Allowed points in the BR(h→AA) vs ghAA plane, on the left for type I and on the right for type II. The value of mA is color coded as indicated by the scales on the right of the plots.

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    • Figure 5
      Figure 5

      As Fig. 2 but for Cγh vs Cgh.

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    • Figure 6
      Figure 6

      As Fig. 2 but for BR(h→AA) vs Cγh.

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    • Figure 7
      Figure 7

      Signal strengths μggh(VV) vs μggh(γγ) for the type I and type II models. The orange points are, as for previous plots, the points with sin(β+α)∼1.

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    • Figure 8
      Figure 8

      BR(h→AA) vs μggh(γγ) for the type I and type II models.

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    • Figure 9
      Figure 9

      Cross sections at s=8  TeV for light A production from gg fusion (top row) and bb¯ associated production (bottom row) in the ττ final state. The cross sections for the μμ final state have exactly the same form but are 2 orders of magnitude lower. Same color scheme as in the previous figures.

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    • Figure 10
      Figure 10

      Constraints in the m12 vs tanβ plane for the H125 case with |cos(β−α)|=1. The shaded regions are those allowed by perturbativity for mh values indicated in the lower-left corner of the plot. The narrow strips between the dashed lines have BR(H→XX)<0.3 for mA<mH/2 or mh<mH/2, respectively (the regions are the same for the two cases), with the color code for the X=h or A masses given in the upper-right corner of the plot. The solid line in the middle of the dashed ones shows gHXX=0.

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    • Figure 11
      Figure 11

      Phenomenologically viable scan points for the H125 scenario in the type I (left) and type II (right) models. The upper row shows the projection onto the m12 vs tanβ plane for comparison with Fig. 10. The lower row shows the tanβ vs sinα plane, including contours of constant cos(β±α) and sin(β+α). In all four plots, the red points have mA≤mH/2 while the blue points have mh≤mH/2. Note that there are no red points for type II; moreover, there are no cos(β+α)∼1 points in type II that pass all constraints.

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    • Figure 12
      Figure 12

      Allowed H125 points for the type I model in the mh vs mA plane. The cyan points have sinα>0, while the orange points have sinα∼−1, cf. the bottom-left plot in Fig. 11.

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    • Figure 13
      Figure 13

      Signal strengths μggH(VV) vs μggH(γγ) for the type I and type II models. Points with mA≤mH/2 are shown in red, and points with mh≤mH/2 are shown in blue.

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    • Figure 14
      Figure 14

      Branching ratios of H→XX (X=h,A) decays vs μggH(γγ) for the type I and type II models. Points with mA≤mH/2 are shown in red, and points with mh≤mH/2 are shown in blue.

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    • Figure 15
      Figure 15

      For the H125 case, we give 8 TeV cross sections for light X=h,A production from gg fusion (upper row) and bb¯ associated production (lower row) in the ττ final state. The blue points are for X=h, and the red points are for X=A.

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