The DarkLight Experiment at TRIUMF

@misc{alarcon2026darklight,
  title = {{The DarkLight Experiment at TRIUMF}},
  author = {R. Alarcon and D. Almonte and M. I. Alstaty and J. Azzi and R. Baartman and J. C. Bernauer and X. Braun and D. Ciarniello and C. Clabeaux and E. W. Cline and E. Corey and R. Corliss and W. Deconinck and A. Deshpande and J. Dilling and J. Dodge and D. H. Dongwi and C. Ekeman and E. A. Fielding and S. Frantzen and I. Friščić and G. Gelinas and S. Gelinas and K. Gill and A. Sabzevari Gonzalez and S. Gupte and D. K. Hasell and M. Hasinoff and B. Humphries and E. Ihloff and N. Jackson and D. Jayakodige and R. Kanungo J. E. Kelsey and O. Kester and M. Kohl and H. W. Koay and R. Laxdal and L. Levack and X. Li and W. Lin and C. Ma and A. Mahon and H. Merkel and J. W. Martin and L. Miller and R. Milner and K. Olchanski and K. Pachal and T. Planche and D. Preddy and S. D. Rädel and G. Randall and J. Redinger and D. A. Reiter and R. Richards and B. Scully and S. Shapiro and M. Suresh and C. Vidal and S. Wang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.05674},
  eprint = {2609.05674},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.05674},
}

TY  - UNPB
TI  - The DarkLight Experiment at TRIUMF
AU  - R. Alarcon
AU  - D. Almonte
AU  - M. I. Alstaty
AU  - J. Azzi
AU  - R. Baartman
AU  - J. C. Bernauer
AU  - X. Braun
AU  - D. Ciarniello
AU  - C. Clabeaux
AU  - E. W. Cline
AU  - E. Corey
AU  - R. Corliss
AU  - W. Deconinck
AU  - A. Deshpande
AU  - J. Dilling
AU  - J. Dodge
AU  - D. H. Dongwi
AU  - C. Ekeman
AU  - E. A. Fielding
AU  - S. Frantzen
AU  - I. Friščić
AU  - G. Gelinas
AU  - S. Gelinas
AU  - K. Gill
AU  - A. Sabzevari Gonzalez
AU  - S. Gupte
AU  - D. K. Hasell
AU  - M. Hasinoff
AU  - B. Humphries
AU  - E. Ihloff
AU  - N. Jackson
AU  - D. Jayakodige
AU  - R. Kanungo J. E. Kelsey
AU  - O. Kester
AU  - M. Kohl
AU  - H. W. Koay
AU  - R. Laxdal
AU  - L. Levack
AU  - X. Li
AU  - W. Lin
AU  - C. Ma
AU  - A. Mahon
AU  - H. Merkel
AU  - J. W. Martin
AU  - L. Miller
AU  - R. Milner
AU  - K. Olchanski
AU  - K. Pachal
AU  - T. Planche
AU  - D. Preddy
AU  - S. D. Rädel
AU  - G. Randall
AU  - J. Redinger
AU  - D. A. Reiter
AU  - R. Richards
AU  - B. Scully
AU  - S. Shapiro
AU  - M. Suresh
AU  - C. Vidal
AU  - S. Wang
PY  - 2026
DA  - 2026/09/04
PB  - arXiv
DO  - 10.48550/arxiv.2609.05674
UR  - https://arxiv.org/abs/2609.05674
AB  - This paper reports on the commissioning of the DarkLight experiment at the ARIEL superconducting electron linear accelerator located at TRIUMF in Vancouver, Canada. DarkLight was designed to utilize the ARIEL electron beam to search for a new boson, A^′, which preferentially couples to leptons, with a mass in the range 13-17 MeV/c^2. Such a boson could be produced via the e^- X→ e^- X A^′ process, and the resulting A^′→ e^+ e^- decay used to reconstruct the invariant mass of the A^′. The e^+e^- pair is detected using a pair of magnetic spectrometers. Each spectrometer is instrumented with two triple GEM detectors and a scintillating strip hodoscope to trigger the event readout. Electron beam energies between 10 and 30 MeV were used to commission the experiment with a 1μm thick carbon target. With both spectrometer polarities set to select electrons, elastic and Møller scattering were used to examine detector performance and compare with predicted distributions from Monte Carlo simulations. Planned upgrades to the e-linac will allow searches to be made with beam energies up to 50 MeV using a 1μm thick tantalum target.
ER  -