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 × 1014 electrons on target at 8 GeV.
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Acknowledgments
Support for UCSB is made possible by the Joe and Pat Yzurdiaga endowed chair in experimental science. Use was made of the UCSB computational facilities administered by the Center for Scientific Computing at the California NanoSystems Institute and Materials Research Laboratory (an NSF MRSEC; DMR-1720256) and purchased through NSF CNS-1725797, and from resources provided by the Swedish National Infrastructure for Computing at the Centre for Scientific and Technical Computing at Lund University (LUNARC), as well as LUNARC’s own infrastructure. Contributions from Caltech, CMU, Stanford, TTU, UMN, and UVA are supported by the U.S. Department of Energy under grants DE-SC0011925, DE-SC0010118, DE-SC0022083, DE-SC0015592, DE-SC00012069, and DE-SC0007838, respectively. Support for Lund University is made possible by the Knut and Alice Wallenberg foundation (project grant Light Dark Matter, Dnr. KAW 2019.0080), and by the Crafoord foundation (Dnr 20190875) and the Royal Physiographic Society of Lund. RP acknowledges support through the L’Oréal-UNESCO For Women in Science in Sweden Prize with support of the Young Academy of Sweden, and from the Swedish Research Council (Dnr 2019-03436). LB acknowledges support from the Knut and Alice Wallenberg Foundation Postdoctoral Scholarship Program at Stanford (Dnr. KAW 2018.0429). JE, GK, CH, WK, CMS, and NT are supported by the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics and the Fermilab LDRD program. CB, PB, OM, TN, PS, and NT are supported by Stanford University under Contract No. DE-AC02-76SF00515 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
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The LDMX collaboration., Åkesson, T., Bravo, C. et al. Photon-rejection power of the Light Dark Matter eXperiment in an 8 GeV beam. J. High Energ. Phys. 2023, 92 (2023). https://doi.org/10.1007/JHEP12(2023)092
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DOI: https://doi.org/10.1007/JHEP12(2023)092