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Sep 4 – 5, 2025
Jefferson Lab
US/Eastern timezone

Probing Millicharged Particles at BDX with Ultralow-Threshold Sensors (remote)

Sep 4, 2025, 11:15 AM
25m
F113 (Jefferson Lab)

F113

Jefferson Lab

Dark Matter and Dark Sector Searches Thursday Morning

Speaker

Zhen Liu

Description

We propose to search for millicharged particles produced in high-intensity electron beam dumps using small ultralow-threshold sensors. As a concrete example, we consider a Skipper-CCD placed behind the beam dump in Hall A at Jefferson Lab. We compute the millicharged particle flux, including both electromagnetic cascade and meson productions emanating from an aluminum target. We find that the sensitivity of a modest 2x14 array of Skipper-CCDs can exceed the sensitivity of all existing searches for millicharged particle masses below 1.5 GeV, and is either competitive or world-leading when compared to other proposed experiments. Our results demonstrate that small-scale ultralow-threshold silicon devices can enhance the reach of accelerator-based experiments, while fitting comfortably within existing experimental halls.

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