Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Torsten Åkesson, Cameron Bravo, Liam Brennan, Lene Kristian Bryngemark, Pierfrancesco Butti
| Summary:
The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target
experiment designed to achieve comprehensive model independent sensitivity to
dark matter particles in the sub-GeV mass region. An upgrade to the LCLS-II
accelerator will increase the beam energy available to LDMX from 4 to 8 GeV.
Using detailed GEANT4-based simulations, we investigate the effect of the
increased beam energy on the capabilities to separate signal and background,
and demonstrate that the veto methodology developed for 4 GeV successfully
rejects photon-induced backgrounds for at least $2times10^{14}$ electrons on
target at 8 GeV.
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