Constraints on Lightly Ionizing Particles from CDMSlite

(SuperCDMS Collaboration)

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) achieved efficient detection of very small recoil energies in its germanium target, resulting in sensitivity to lightly ionizing particles (LIPs) in a previously unexplored region of charge, mass, and velocity parameter space. We report first direct-detection limits calculated using the optimum interval method on the vertical intensity of cosmogenically produced LIPs with an electric charge smaller than e/(3×10^{5}), as well as the strongest limits for charge ≤e/160, with a minimum vertical intensity of 1.36×10^{-7}  cm^{-2} s^{-1} sr^{-1} at charge e/160. These results apply over a wide range of LIP masses (5  MeV/c^{2} to 100  TeV/c^{2}) and cover a wide range of βγ values (0.1-10^{6}), thus excluding nonrelativistic LIPs with βγ as small as 0.1 for the first time.

Original languageEnglish (US)
Article number081802
JournalPhysical review letters
Issue number8
StatePublished - Aug 20 2021

Bibliographical note

Funding Information:
The SuperCDMS Collaboration gratefully acknowledges technical assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. The CDMSlite and iZIP detectors were fabricated in the Stanford Nanofabrication Facility, which is a member of the National Nanofabrication Infrastructure Network, sponsored and supported by the NSF. Funding and support were received from the National Science Foundation, the U.S. Department of Energy (DOE), NSF OISE 1743790, Fermilab URA Visiting Scholar Grant No. 15-S-33, NSERC Canada, the Canada First Excellence Research Fund, the Arthur B. McDonald Institute (Canada), the Department of Atomic Energy Government of India (DAE), the Department of Science and Technology (DST, India) and the DFG (Germany)–Project No. 420484612 and under Germany’s Excellence Strategy–EXC 2121 “Quantum Universe”—390833306. Fermilab is operated by Fermi Research Alliance, LLC, SLAC is operated by Stanford University, and PNNL is operated by the Battelle Memorial Institute for the U.S. Department of Energy under Contracts No. DE-AC02-37407CH11359, No. DE-AC02-76SF00515, and No. DE-AC05-76RL01830, respectively.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.


Dive into the research topics of 'Constraints on Lightly Ionizing Particles from CDMSlite'. Together they form a unique fingerprint.

Cite this