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A high efficiency photon veto for the Light Dark Matter eXperiment

Åkesson, Torsten LU ; Blinov, Nikita ; Bryngemark, Lene LU ; Colegrove, Owen ; Collura, Giulia ; Dukes, Craig ; Dutta, Valentina ; Echenard, Bertrand ; Eichlersmith, Thomas and Group, Craig , et al. (2020) In Journal of High Energy Physics 2020(4).
Abstract

Fixed-target experiments using primary electron beams can be powerful discovery tools for light dark matter in the sub-GeV mass range. The Light Dark Matter eXperiment (LDMX) is designed to measure missing momentum in high-rate electron fixed-target reactions with beam energies of 4 GeV to 16 GeV. A prerequisite for achieving several important sensitivity milestones is the capability to efficiently reject backgrounds associated with few-GeV bremsstrahlung, by twelve orders of magnitude, while maintaining high efficiency for signal. The primary challenge arises from events with photo-nuclear reactions faking the missing-momentum property of a dark matter signal. We present a methodology developed for the LDMX detector concept that is... (More)

Fixed-target experiments using primary electron beams can be powerful discovery tools for light dark matter in the sub-GeV mass range. The Light Dark Matter eXperiment (LDMX) is designed to measure missing momentum in high-rate electron fixed-target reactions with beam energies of 4 GeV to 16 GeV. A prerequisite for achieving several important sensitivity milestones is the capability to efficiently reject backgrounds associated with few-GeV bremsstrahlung, by twelve orders of magnitude, while maintaining high efficiency for signal. The primary challenge arises from events with photo-nuclear reactions faking the missing-momentum property of a dark matter signal. We present a methodology developed for the LDMX detector concept that is capable of the required rejection. By employing a detailed Geant4-based model of the detector response, we demonstrate that the sampling calorimetry proposed for LDMX can achieve better than 10−13 rejection of few-GeV photons. This suggests that the luminosity-limited sensitivity of LDMX can be realized at 4 GeV and higher beam energies. [Figure not available: see fulltext.]

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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Beyond Standard Model, Dark matter, Fixed target experiments
in
Journal of High Energy Physics
volume
2020
issue
4
article number
3
publisher
Springer
external identifiers
  • scopus:85083364627
ISSN
1126-6708
DOI
10.1007/JHEP04(2020)003
language
English
LU publication?
yes
id
bc0762d0-0bce-402a-b280-21a68137cb3c
date added to LUP
2020-04-30 11:53:56
date last changed
2020-05-06 06:29:01
@article{bc0762d0-0bce-402a-b280-21a68137cb3c,
  abstract     = {<p>Fixed-target experiments using primary electron beams can be powerful discovery tools for light dark matter in the sub-GeV mass range. The Light Dark Matter eXperiment (LDMX) is designed to measure missing momentum in high-rate electron fixed-target reactions with beam energies of 4 GeV to 16 GeV. A prerequisite for achieving several important sensitivity milestones is the capability to efficiently reject backgrounds associated with few-GeV bremsstrahlung, by twelve orders of magnitude, while maintaining high efficiency for signal. The primary challenge arises from events with photo-nuclear reactions faking the missing-momentum property of a dark matter signal. We present a methodology developed for the LDMX detector concept that is capable of the required rejection. By employing a detailed Geant4-based model of the detector response, we demonstrate that the sampling calorimetry proposed for LDMX can achieve better than 10<sup>−13</sup> rejection of few-GeV photons. This suggests that the luminosity-limited sensitivity of LDMX can be realized at 4 GeV and higher beam energies. [Figure not available: see fulltext.]</p>},
  author       = {Åkesson, Torsten and Blinov, Nikita and Bryngemark, Lene and Colegrove, Owen and Collura, Giulia and Dukes, Craig and Dutta, Valentina and Echenard, Bertrand and Eichlersmith, Thomas and Group, Craig and Hiltbrand, Joshua and Hitlin, David G. and Incandela, Joseph and Krnjaic, Gordan and Lazaro, Juan and Li, Amina and Mans, Jeremiah and Masterson, Phillip and McCormick, Jeremy and Moreno, Omar and Mullier, Geoffrey and Nagar, Akshay and Nelson, Timothy and Niendorf, Gavin and Oyang, James and Petersen, Reese and Pöttgen, Ruth and Schuster, Philip and Siegel, Harrison and Toro, Natalia and Tran, Nhan and Whitbeck, Andrew},
  issn         = {1126-6708},
  language     = {eng},
  number       = {4},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {A high efficiency photon veto for the Light Dark Matter eXperiment},
  url          = {http://dx.doi.org/10.1007/JHEP04(2020)003},
  doi          = {10.1007/JHEP04(2020)003},
  volume       = {2020},
  year         = {2020},
}