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Invisible decay of the Higgs boson in the context of a thermal and nonthermal relic in MSSM

Rahool Kumar Barman, Genevieve Bélanger, Biplob Bhattacherjee, Rohini Godbole, Gaurav Mendiratta, and Dipan Sengupta
Phys. Rev. D 95, 095018 – Published 19 May 2017
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  • INTRODUCTION
  • MODEL, PARAMETER SPACE, AND CONSTRAINTS
  • CONSTRAINTS FROM ELECTROWEAKINO SEARCHES…
  • THE NEUTRALINO AS A THERMAL RELIC
  • PROBING OVERABUNDANT NEUTRALINOS
  • COMPLEMENTARITY OF FUTURE EXPERIMENTS IN…
  • PROSPECTS FOR HIGH LUMINOSITY LHC
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We study the decay of 125 GeV Higgs boson to a pair of lightest neutralinos in the phenomenological minimal supersymmetric standard model in the context of collider searches and astrophysical experiments. We consider the parameter space for light neutralinos that can be probed via the invisible Higgs decays and Higgsino searches at the ILC. We consider the cases where the light neutralino is compatible with the observed relic density or where the thermal relic is overabundant, pointing to nonstandard cosmology. In the former case, when the neutralino properties give rise to underabundant relic density, the correct amount of relic abundance is assumed to be guaranteed by either additional dark matter particles or by nonthermal cosmology. We contrast these different cases. We assess what astrophysical measurements can be made, in addition to the measurements made at the ILC, which can provide a clue to the nature of the light neutralino. We find that a number of experiments, including Xenon-nT, PICO-250, and LZ, in conjunction with measurements made at the ILC on invisible Higgs width can pin down the nature of this neutralino, along with its cosmological implications. Additionally, we also point out potential LHC signatures that could be complementary in this region of parameter space.

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    • Received 17 March 2017

    DOI:https://doi.org/10.1103/PhysRevD.95.095018

    © 2017 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Extensions of Higgs sectorParticle dark matterSupersymmetric models
    Particles & Fields

    Authors & Affiliations

    Rahool Kumar Barman1,*, Genevieve Bélanger2,†, Biplob Bhattacherjee1,‡, Rohini Godbole1,§, Gaurav Mendiratta1,5,∥, and Dipan Sengupta3,4,¶

    • 1Center for High Energy Physics, Indian Institute of Science, Bangalore 560012, India
    • 2LAPTh, Université Savoie Mont Blanc, CNRS, B.P. 110, F-74941 Annecy Cedex, France
    • 3Department of Physics and Astronomy, Michigan State University, 567 Wilson Road, East Lansing, Michigan 48824, USA
    • 4Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Avenue Des Martyrs, F-38026 Grenoble, France
    • 5Salk Institute for Biological Studies, 10010 N Torrey Pines Road, La Jolla, California 92037, USA

    • *rahoolkbarman@chep.iisc.ernet.in
    • †belanger@lapth.cnrs.fr
    • ‡biplob@chep.iisc.ernet.in
    • §rohini@chep.iisc.ernet.in
    • ∥gauravm.137@gmail.com
    • dipan@pa.msu.edu

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    Issue

    Vol. 95, Iss. 9 — 1 May 2017

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    Images

    • Figure 1
      Figure 1

      The 95% C.L. contours in the μ−M2 plane from dilepton (dashed lines) and trilepton (solid lines) searches at LHC-8 TeV for M1=5,40,60  GeV. Here tanβ=10. Green points correspond to the allowed points of the scan after imposing all constraints in Sec. 2. Only the region μ<1  TeV is displayed, as the contours are independent of μ for low values of M2.

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    • Figure 2
      Figure 2

      (a) The Higgs to invisible branching Br(h→χ˜10χ˜10) vs the LSP mass Mχ˜10. The grey (colored) points distinguish the points allowed before (after) the Higgs signal strength constraints. Yellow (green) points are excluded (allowed) by the current limits on the SI WIMP-nucleon cross section from LUX-2016 [109]. The black-dashed line represents the ILC reach, Br(h→χ˜10χ˜10)>0.4% [25]. (b) SI WIMP-nucleon cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid line shows the current limit from LUX-2016 [109], and the blue-dashed lines show the projected reach for Xenon-1T [110] and Xenon-nT [110].

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    • Figure 3
      Figure 3

      (a) SD WIMP-proton cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid line shows the current limit from LUX-2013 [112], and the blue-dashed line shows the projected reach for PICO-250 [113]. (b) SD WIMP-neutron cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid line shows the current limit from LUX-2013 [112], and the blue-dashed line shows the projected reach for LZ [112].

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    • Figure 4
      Figure 4

      (a) The normalized relic density, ξ=ΩDM/0.122, vs the LSP mass, using the same color code as in Fig. 2. (b) Higgsino mass parameter μ against the LSP mass, where the black dashed line represents the ILC sensitivity to probe μ<500  GeV. Here, only the parameter points allowed by collider constraints and LUX-2016 have been considered. The color code is described in the text.

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    • Figure 5
      Figure 5

      Unscaled SI WIMP-nucleon cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid line shows the current limit from LUX-2016 [109], and the blue-dashed lines show the projected reach for Xenon-1T [110] and Xenon-nT [110].

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    • Figure 6
      Figure 6

      (a) The Higgs to invisible branching fraction Br(h→χ˜10χ˜10) vs the LSP mass Mχ˜10. (b) The rescaled relic density, ξ, against Mχ˜10. Same color code as Fig. 2.

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    • Figure 7
      Figure 7

      SI WIMP-nucleon cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The color code characterizes the value of Br(h→χ˜10χ˜10), while black points have Br(h→χ˜10χ˜10)<0.4%. The blue-solid line shows the current limit from LUX-2016 [109], and the blue-dashed line shows the reach for Xenon-1T [110] and Xenon- nT [110].

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    • Figure 8
      Figure 8

      (a) SD WIMP-proton cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid and blue-dashed lines show the current limits from LUX-2013 [112] and the reach of PICO-250 [113], respectively. (b) SD WIMP-neutron cross section vs Mχ˜10 for all points allowed by collider and relic density constraints. The blue-solid line and the blue-dashed line show the current limits from LUX-2013 [112] and the reach of LZ [112], respectively. The color code characterizes the value of Br(h→χ˜10χ˜10), and black points have Br(h→χ˜10χ˜10)<0.4%.

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    • Figure 9
      Figure 9

      Represents the chargino mass (Mχ˜1±) against Mχ˜10 for the allowed parameter space points. The corresponding color code is mentioned in the text.

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    • Figure 10
      Figure 10

      Scatter plot in the Br(h→χ˜10χ˜10)−Mχ˜10 plane for parameter space points which can be probed by ILC only, through the Higgs to invisible branching fraction. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 11
      Figure 11

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by ILC only, through the Higgs to invisible branching fraction [Br(H→χ˜10χ˜10)≥0.4%]. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 12
      Figure 12

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by Xenon-nT only, through the SI WIMP-nucleon interactions. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 13
      Figure 13

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by Xenon-nT only, through the SD WIMP-nucleon interactions. For these parameter space points μ>500  GeV. The color palette corresponds to the value of Mχ˜10.

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    • Figure 14
      Figure 14

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by Xenon-nT through the SI WIMP-nucleon interactions and also by ILC through the Higgs to invisible branching. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 15
      Figure 15

      (a) Scatter plot in the Br(h→χ˜10χ˜10)−Mχ˜10 plane and (b) in the ξ−Mχ˜10 plane for parameter space points which can be probed by PICO-250 through the SD WIMP-proton interactions, by Xenon-nT through the SI WIMP-nucleon based interactions, and also by ILC through the Higgs to invisible branching. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 16
      Figure 16

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by PICO-250 through the SD WIMP-proton interactions and by Xenon-nT through the SI WIMP-nucleon based interactions. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 17
      Figure 17

      (a) Scatter plot in the Br(h→χ˜10χ˜10)−Mχ˜10 plane. (b) Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by PICO-250 through the SD WIMP-proton interactions and also by ILC through the Higgs to invisible branching. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 18
      Figure 18

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by LZ through the SD WIMP-neutron interactions and by Xenon-nT through the SI WIMP-nucleon based interactions. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 19
      Figure 19

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by LZ through the SD WIMP-neutron interactions, by Xenon-nT through the SI WIMP-nucleon based interactions and by ILC through the Higgs to invisible branching fraction. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 20
      Figure 20

      Scatter plot in the ξ−Mχ˜10 plane for parameter space points which can be probed by PICO-250 through the SD WIMP-proton interactions, by LZ through the SD WIMP-neutron interaction, by Xenon-nT through the SI WIMP-nucleon based interactions, and also by ILC through the Higgs to invisible branching fraction. The color palette corresponds to the value of the Higgsino mass parameter (μ).

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    • Figure 21
      Figure 21

      Scatter plot in the σSI−ξ plane for parameter space points which can be probed by PICO-250 through the SD WIMP-proton interactions, by LZ through the SD WIMP-neutron interaction, by Xenon-nT through the SI WIMP-nucleon based interactions, and also by ILC through the Higgs to invisible branching fraction. The color palette corresponds to the value of the LSP mass (Mχ˜10).

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