DarkSHINE Baseline Design Report: Physics Prospects and Detector Technologies

TL;DR

DarkSHINE is a proposed fixed-target experiment utilizing high repetition electron beams to search for invisible Dark Photon decays, detailing its design, physics goals, detector technologies, and expected sensitivities.

Contribution

This report presents the baseline design of the DarkSHINE experiment, including its physics objectives, detector configurations, and sensitivity estimates, advancing the development of dark sector searches.

Findings

Design of detector systems and background models

Projected sensitivity to Dark Photon decays

Feasibility of using SHINE facility for dark sector experiments

Abstract

DarkSHINE is a newly proposed fixed-target experiment initiative to search for the invisible decay of Dark Photon via missing energy/momentum signatures, based on the high repetition rate electron beam to be deployed/delivered by the Shanghai High repetition rate XFEL and Extreme light facility (SHINE). This report elaborates the baseline design of DarkSHINE experiment by introducing the physics goals, experimental setups, details of each sub-detector system technical designs, signal and backgground modelings, expected search sensitivities and future prospects, which mark an important step towards the further prototyping and technical demonstrations.