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Nucleon-decay-like signatures of hylogenesis

S. V. Demidov and D. S. Gorbunov
Phys. Rev. D 93, 035009 – Published 9 February 2016
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  • INTRODUCTION
  • LOW-ENERGY EFFECTIVE LAGRANGIAN AND…
  • SCATTERING PROCESSES Ψ(Φ)n→Φ(Ψ)γ
  • SCATTERING PROCESSES Ψ(Φ)+n→Φ(Ψ)+e+e−
  • PROCESSES Ψ(Φ)+N→Φ(Ψ)+2 MESONS
  • CONCLUSIONS
  • ACKNOWLEDGMENTS
  • APPENDICES
    • References

    Abstract

    We consider nucleon-decay-like signatures of hylogenesis, a variant of the antibaryonic dark matter model. For the interaction between visible and dark matter sectors through the neutron portal, we calculate the rates of dark matter scatterings off a neutron which mimic neutron-decay processes n→νγ and n→νe+e− with richer kinematics. We obtain bounds on the model parameters from nonobservation of the neutron decays by applying the kinematical cuts adopted in the experimental analyses. The bounds are generally (much) weaker than those coming from the recently performed study of events with a single jet of high transverse momentum and missing energy observed at the LHC. Then we suggest several new nucleon-decay-like processes with two mesons in the final state and estimate (accounting for the LHC constraints) the lower limits on the nucleon lifetime with respect to these channels. The obtained values appear to be promising for probing the antibaryonic dark matter at future underground experiments like HyperK and DUNE.

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    • Received 27 October 2015

    DOI:https://doi.org/10.1103/PhysRevD.93.035009

    © 2016 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Particle dark matter
    1. Physical Systems
    Neutrons
    Particles & Fields

    Authors & Affiliations

    S. V. Demidov1,* and D. S. Gorbunov2,†

    • 1Institute for Nuclear Research of the Russian Academy of Sciences, Moscow 117312, Russia
    • 2Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia

    • *demidov@ms2.inr.ac.ru
    • †gorby@ms2.inr.ac.ru

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    Issue

    Vol. 93, Iss. 3 — 1 February 2016

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    • Figure 1
      Figure 1

      Contours (thin lines) of constant lifetime (in years) of a neutron with respect to the processes Ψn→Φγ and Φn→Ψγ, assuming equal number densities of the two dark matter components and parameters Λ=MX=1  TeV and y=1. Present experimental bounds are applicable in the violet (light grey) regions on the plot. Thick lines in these regions show the limits on the quantity (Λ2MX/y)1/3 in GeV.

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    • Figure 2
      Figure 2

      Contours (thin lines) of constant lifetime (in years) of a neutron with respect to the process Ψ(Φ)n→Φ(Ψ)e+e−; we set Λ=MX=1  TeV and y=1. Present experimental bounds are applicable in the violet (light grey) region on the plot. Thick lines in this region show the limits on the quantity (Λ2MX/y)1/3.

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    • Figure 3
      Figure 3

      Lifetime of a neutron with respect to IND n→e+e− for η=100 and η=0.01; we set Λ=MX=1  TeV and y=1. The current limits are applied in shaded regions.

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    • Figure 4
      Figure 4

      Lifetime of a neutron with respect to the processes Φ+n→Ψ+γ (for η=100) and Ψ+n→Φ+γ (for η=0.01); we set Λ=MX=1  TeV and y=1.

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    • Figure 5
      Figure 5

      The Feynman diagrams for the process Ψ+p→Φ+K¯0K+.

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    • Figure 6
      Figure 6

      The Feynman diagrams for the process Ψ+p→Φ+π+π0.

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    • Figure 7
      Figure 7

      Contours of constant lifetime (in years) of the nucleon in the symmetric case with respect to IND process with π+π0 in the final state; we set Λ=MX=1  TeV and y=1.

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    • Figure 8
      Figure 8

      The Feynman diagrams for the process Ψ+n→Φ+π+π− .

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    • Figure 9
      Figure 9

      The Feynman diagrams for the process Ψ+p→Φ+π+η .

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    • Figure 10
      Figure 10

      Contours of the constant lifetime (in years) of the nucleon in the symmetric case with respect to IND with π+η in the final state; we set Λ=MX=1  TeV and y=1.

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    • Figure 11
      Figure 11

      Contours of the constant lifetime (in years) of the nucleon in the symmetric case with respect to IND with π0η in the final state; we set Λ=MX=1  TeV and y=1.

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    • Figure 12
      Figure 12

      Contours of the constant lifetime (in years) of the nucleon in the symmetric case with respect to IND process with π0π0 in the final state; we set Λ=MX=1  TeV and y=1.

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    • Figure 13
      Figure 13

      Contours of constant lifetime (in years) of the nucleon in the asymmetric case, η=100 , with respect to the two-meson processes: a) K¯0K+; b) ηη; c) π0η; d) π+η; e) π0π0; g) π+π0. Numbers for other processes with kaons are similar to a) while for process with π+π−are similar to g). We set Λ=MX=1  TeV and y=1.

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    • Figure 14
      Figure 14

      Contours of constant lifetime (in years) of the nucleon in the asymmetric case, η=0.01 , with respect to the two-meson processes. Other notations are the same as in Fig. 13.

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