PoS - Proceedings of Science
Volume 448 - The 32nd International Workshop on Vertex Detectors (VERTEX2023) - Future vertex detectors
Vertex and Tracking detector for the LDMX experiment
P. Butti
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The constituents of dark matter (DM) are still unknown, and the viable possibilities span a
very large mass range. Considerable experimental attention has been given to exploring Weakly
Interacting Massive Particles in the upper end of this range (few GeV – TeV), while the region
MeV to GeV is largely unexplored. If there is an interaction between light DM and ordinary
matter, as there must be in the case of a thermal origin, then there necessarily is a production
mechanism in accelerator-based experiments. The most sensitive way, (if the interaction is not
electron-phobic) to search for this production is to use a primary electron beam to produce DM
in fixed-target collisions. The Light Dark Matter eXperiment (LDMX) is a planned electron-
beam fixed-target missing-momentum experiment that has unique sensitivity to light DM in the
sub-GeV range and, if a signal would be observed, can estimate the dark matter mass scale. The
LDMX working principle is based on the efficient reconstruction of the incoming beam electron
on target as well as the precise measurement of the transverse momentum of the scattered recoil
electron. The experiment employs two silicon strip based trackers, named Tagger and Recoil
trackers, specifically designed to achieve the experiment physics requirements. This contribution
will give an overview of the LDMX experiment tracking system, its projected performance and
details on the reconstruction techniques in a highly inhomogeneous magnetic field.
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