Photon-rejection Power of the Light Dark Matter eXperiment in an 8 GeV   Beam

Torsten \r{A}kesson (1); Cameron Bravo (2); Liam Brennan (3); Lene; Kristian Bryngemark (1); Pierfrancesco Butti (2); E. Craig Dukes (4),; Valentina Dutta (5); Bertrand Echenard (6); Thomas Eichlersmith (7); Jonathan; Eisch (8); Einar El\'en (1); Ralf Ehrlich (4); Cooper Froemming (7); Andrew; Furmanski (7); Niramay Gogate (9); Chiara Grieco (3); Craig Group (4); Hannah; Herde (1); Christian Herwig (8); David G. Hitlin (6); Tyler Horoho (4),; Joseph Incandela (3); Wesley Ketchum (8); Gordan Krnjaic (8); Amina Li (3),; Jeremiah Mans (7); Phillip Masterson (3); Sophie Middleton (6); Omar Moreno; (2); Geoffrey Mullier (1); Joseph Muse (7); Timothy Nelson (2); Rory O'Dwyer; (10); Leo \"Ostman (1); James Oyang (6); Jessica Pascadlo (4); Ruth P\"ottgen; (1); Luis G. Sarmiento (1); Philip Schuster (2); Matthew Solt (4); Cristina; Mantilla Suarez (8); Lauren Tompkins (10); Natalia Toro (2); Nhan Tran (8),; Erik Wallin (1); Andrew Whitbeck (9); Danyi Zhang (3) ((1) Lund University,; (2) SLAC National Accelerator Laboratory; (3) University of California at; Santa Barbara; (4) University of Virginia; (5) Carnegie Mellon University,; (6) California Institute of Technology; (7) University of Minnesota; (8); Fermi National Accelerator Laboratory; (9) Texas Tech University; (10); Stanford University)

arXiv:2308.15173·hep-ex·September 6, 2023

Photon-rejection Power of the Light Dark Matter eXperiment in an 8 GeV Beam

Torsten \r{A}kesson (1), Cameron Bravo (2), Liam Brennan (3), Lene, Kristian Bryngemark (1), Pierfrancesco Butti (2), E. Craig Dukes (4),, Valentina Dutta (5), Bertrand Echenard (6), Thomas Eichlersmith (7), Jonathan, Eisch (8), Einar El\'en (1), Ralf Ehrlich (4)

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TL;DR

This study evaluates how increasing the beam energy to 8 GeV in the LDMX experiment enhances its ability to reject photon-induced backgrounds, maintaining effective background suppression at higher energies.

Contribution

The paper demonstrates that the photon-rejection veto methodology remains effective at 8 GeV, extending the experimental sensitivity for dark matter detection.

Findings

01

Veto method successfully rejects photon backgrounds at 8 GeV

02

Background rejection efficiency comparable to 4 GeV setup

03

Supports higher energy operation for improved dark matter sensitivity

Abstract

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 $2 \times 1 0^{14}$ electrons on target at 8 GeV.

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