Search for low-mass dark matter via bremsstrahlung radiation and the Migdal effect in SuperCDMS

The authors would like to thank Matthew Dolan, Timon Emken, Masahiro Ibe, Felix Kahlhoefer, Chris McCabe, Wakutaka Nakano, Jayden Newstead, Yutaro Shoji, and Kazumine Suzuki for their useful discussions. 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), 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 DE-AC02-37407CH11359, DE-AC02-76SF00515, and DE-AC05-76RL01830, respectively. E. L. A. acknowledges the support from Spanish grant CA3/RSUE/2021-00827, funded by Ministerio de Universidades, Plan de Recuperacion, Transformacion y Resiliencia, and Universidad Autonoma de Madrid.