Abstract
We propose a simple mechanism for copiously producing heavy Higgs bosons with enhanced decay rates to two photons at the LHC, within the context of the Minimal Supersymmetric extension of the Standard Model (MSSM). In the CP-conserving limit of the theory, such a diphoton resonance may be identified with the heavier CP-even $H$ boson, whose gluon-fusion production and decay into two photons are enhanced by loops of the lightest supersymmetric partner of the top quark $\tilde{t}_1$ when its mass $m_{\tilde{t}_1}$ happens to be near the $\tilde{t}^*_1\tilde{t}_1$ threshold, i.e.~for $m_{\tilde{t}_1}\!\simeq \!\frac12 M_H$. The scenario requires a relatively low supersymmetry-breaking scale $M_S\stackrel{<}{{}_\sim} 1$ TeV, but large values of the higgsino mass parameter, $\mu \stackrel{>}{{}_\sim} 1$ TeV, that lead to a strong $H \tilde{t}^*_1 \tilde{t}_1$ coupling. Such parameters can accommodate the observed mass and standard-like couplings of the 125 GeV $h$ boson in the MSSM, while satisfying all other constraints from the LHC and dark matter searches. Additional enhancement to the diphoton rate could be provided by Coulombic QCD corrections and, to a lesser extent, by resonant contributions due to $\tilde{t}_1^* \tilde{t}_1$ bound states. To discuss the characteristic features of such a scenario, we consider as an illustrative example the case of a diphoton resonance with a mass of approximately 750 GeV, for which an excess was observed in the early LHC 13 TeV data and which later turned out to be simply a statistical fluctuation.
Highlights
We propose a simple mechanism for copiously producing heavy Higgs bosons with enhanced decay rates to two photons at the LHC, within the context of the Minimal Supersymmetric extension of the Standard
In the CP-conserving limit of the theory, such a diphoton resonance may be identified with the heavier CP-even H boson, whose gluon–fusion production and decay into two photons are enhanced by loops of the lightest supersymmetric partner of the top quark t1 when its mass mt1 happens to be near the t1∗t1 threshold, i.e. for mt1
To discuss the characteristic features of such a scenario, we consider as an illustrative example the case of a diphoton resonance with a mass of approximately 750 GeV, for which an excess was observed in the early LHC 13 TeV data and which later turned out to be a statistical fluctuation
Summary
A Laboratoire de Physique Théorique, CNRS and Université Paris-Sud, Bât. 210, F-91405 Orsay Cedex, France b Theory Department, CERN, CH 1211 Geneva 23, Switzerland c Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom article info. The heavy neutral H and A bosons are degenerate in mass M H ≈ M A in the so-called decoupling regime M A M Z in which the lighter CP-even h state, corresponding to the observed 125 GeV Higgs boson, has SM-like couplings as indicated by the LHC data [7] It has been shown [6] that in most of the MSSM parameter space, a diphoton rate of O(a few fb) cannot be generated using purely the MSSM particle content. When all the ingredients discussed above are put together, the cross section σ (gg → H) √times the decay branching ratio BR(H → γ γ ) at the LHC with s = 13 TeV is displayed in Fig. 2 as a function of the parameter μ for the representative values tan β = 3, 5, 10, 20 and M H = 750 GeV.
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