Supersymmetric subelectroweak scale dark matter, the Galactic Center gamma-ray excess, and exotic decays of the 125 GeV Higgs boson

Abstract

We continue our exploration of the nearly Peccei-Quinn symmetric limit shared by common singlet extensions of the Minimal Supersymmetric Standard Model. This limit has been established as a viable framework for studying sub-electroweak scale dark matter phenomenology and has interesting and direct connections to new exotic Higgs decay physics. We present analytic calculations to motivate the important phenomenological features mentioned above. We also discuss benchmark points in this model framework that accommodate the observed Galactic Center gamma ray excess. We emphasize connections between phenomenology of dark matter direct detection and indirect detection, and new exotic decay channels for the 125 GeV Higgs boson. We conclude by identifying two benchmark modes of exotic Higgs decays for h → τ + τ − E T and h → bb E T final states and estimate their sensitivity prospects at the LHC.

Supersymmetry explanation of the Fermi Galactic Center excess and its test at LHC run II

“…Recent data analyses of the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope have shown an excess around 1-4 GeV in the photon energy spectrum coming from the Galactic Center [8][9][10][11][12][13][14][15][16][17]. It has been shown that this excess can be well explained by a ~35 GeV DM annihilating 100% into bb with a thermal averaged cross section of about 2 x 10-26 cm3/s, which is remarkably close to the value required by the measured relic density Q/t2 [13,16], So far several works have studied such a Galactic Center excess (GCE) in supersymmetry [18][19][20][21][22][23][24], It was found that after considering the constraints from the £lh2, the most Junjiec@itp.ac.cn 1 shlwelll988@gmail.com *pwwu@itp. ac.cn *jmyang@itp.ac.cn "zhangyang@itp.…”

Non-standard higgs decays in U(1) extensions of the MSSM

“…This is not a surprising result. Indeed, in the PQ symmetric limit, when the global PQ symmetry is only broken spontaneously, the coupling G h 1 A 1 A 1 is set by (see for example [128]) 16) where M P Q is the PQ symmetry breaking scale and ε represents a suppression associated with the mixing between the SM-like Higgs state and heavy CP-even Higgs states that induce the breakdown of the PQ symmetry. Equation (4.16) also determines the size of G h 1 A 1 A 1 when the PQ violating couplings are rather small and m A 1 is naturally very light.…”

Hunting the dark Higgs

“…For example, ref. [68] 7 A similar experimental signature has also been considered in the context of exotic Higgs decays [64,65].…”