Dark Matter searches with photons at the LHC

Kavli Affiliate: Carlos E. M. Wagner

| First 5 Authors: Subhojit Roy, Carlos E. M. Wagner, , ,

| Summary:

We unveil blind spot regions in dark matter (DM) direct detection (DMDD), for
weakly interacting massive particles with a mass around a few hundred~GeV that
may reveal interesting photon signals at the LHC. We explore a scenario where
the DM primarily originates from the singlet sector within the $Z_3$-symmetric
Next-to-Minimal Supersymmetric Standard Model (NMSSM). A novel DMDD
spin-independent blind spot condition is revealed for singlino-dominated DM, in
cases where the mass parameters of the higgsino and the singlino-dominated
lightest supersymmetric particle (LSP) exhibit opposite relative signs (i.e.,
$kappa < 0$), emphasizing the role of nearby bino and higgsino-like states in
tempering the singlino-dominated LSP. Additionally, proximate bino and/or
higgsino states can act as co-annihilation partner(s) for singlino-dominated
DM, ensuring agreement with the observed relic abundance of DM. Remarkably, in
scenarios involving singlino-higgsino co-annihilation, higgsino-like
neutralinos can distinctly favor radiative decay modes into the
singlino-dominated LSP and a photon, as opposed to decays into leptons/hadrons.
In exploring this region of parameter space within the singlino-higgsino
compressed scenario, we study the signal associated with at least one
relatively soft photon alongside a lepton, accompanied by substantial missing
transverse energy and a hard initial state radiation jet at the LHC. In the
context of singlino-bino co-annihilation, the bino state, as the next-to-LSP,
exhibits significant radiative decay into a soft photon and the LSP, enabling
the possible exploration at the LHC through the triggering of this soft photon
alongside large missing transverse energy and relatively hard leptons/jets
resulting from the decay of heavier higgsino-like states.

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