Year: 2026
Type: preprint
Abstract: Solar capture of inelastic dark matter does not by itself fix the annihilation signal. We consider a scalar low-energy model with a $B-3L_τ$ current, motivated by the high-energy recoil candidate reported by LUX-ZEPLIN. For $m_χ=840~\mathrm{GeV}$, a $320~\mathrm{keV}$ splitting, and a $160~\mathrm{MeV}$ mediator, the public LZ response gives 0.965 expected accepted events, while micrOMEGAs gives $Ωh^2=0.11999834$. Finite-momentum nuclear responses leave iron as an important solar-capture target despite the near cancellation of its coherent charge at zero momentum transfer. The captured population remains extended after thermal nuclear motion, elastic and inelastic scattering, and excited-state decay are included, with $r_{\rm eff}=0.215R_\odot$. Same-state annihilation is open, but the inferred rate is only 0.0404 of the public IceCube $W^+W^-$-calibrated proxy and is smaller than the corresponding isothermal estimate by a factor of 628. For this benchmark, substantial solar capture is accompanied by a weak neutrino signal.
Source: arXiv (Cornell University)
Authors: Qi, XinXin, Sun, Hao
Institution: Dalian University of Technology
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G4485591216, G8854832815
OpenAlex ID: W7212243590