Constraints on Lightly Ionizing Particles from CDMSlite

Creators: Alkhatib, I.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; Barker, D.; Bathurst, C.; Bauer, D. A.; Bezerra, L. V. S.; Bhattacharyya, R.; Bowles, M. A.; Brink, P. L.; Bunker, R.; Cabrera, B.; Calkins, R.; Cameron, R. A.; Cartaro, C.; Cerdeño, D. G.; Chang, Y.-Y.; Chaudhuri, M.; Chen, R.; Chott, N.; Cooley, J.; Coombes, H.; Corbett, J.; Cushman, P.; De Brienne, F.; di Vacri, M. L.; Diamond, M. D.; Fascione, E.; Figueroa-Feliciano, E.; Fink, C. W.; Fouts, K.; Fritts, M.; Gerbier, G.; Germond, R.; Ghaith, M.; Golwala, S. R.; Harris, H. R.; Hines, B. A.; Hollister, M. I.; Hong, Z.; Hoppe, E. W.; Hsu, L.; Huber, M. E.; Iyer, V.; Jardin, D.; Jastram, A.; Kashyap, V. K. S.; Kelsey, M. H.; Kubik, A.; Kurinsky, N. A.; Lawrence, R. E.; Li, A.; Loer, B.; Lopez Asamar, E.; Lukens, P.; MacFarlane, D. B.; Mahapatra, R.; Mandic, V.; Mast, N.; Mayer, A. J.; Meyer zu Theenhausen, H.; Michaud, É. M.; Michielin, E.; Mirabolfathi, N.; Mohanty, B.; Morales Mendoza, J. D.; Nagorny, S.; Nelson, J.; Neog, H.; Novati, V.; Orrell, J. L.; Oser, S. M.; Page, W. A.; Partridge, R.; Podviianiuk, R.; Ponce, F.; Poudel, S.; Pradeep, A.; Pyle, M.; Rau, W.; Reid, E.; Ren, R.; Reynolds, T.; Roberts, A.; Robinson, A. E.; Saab, T.; Sadoulet, B.; Sander, J.; Sattari, A.; Schnee, R. W.; Scorza, S.; Serfass, B.; Sincavage, D. J.; Stanford, C.; Street, J.; Toback, D.; Underwood, R.; Verma, S.; Villano, A. N.; von Krosigk, B.; Watkins, S. L.; Wilson, J. S.; Wilson, M. J.; Winchell, J.; Wright, D. H.; Yellin, S.; Young, B. A.; Yu, T. C.; Zhang, E.; Zhang, H. G.; Zhao, X.; Zheng, L.; SuperCDMS Collaboration

Abstract

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 × 10⁵), 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/c² to 100 TeV/c²) and cover a wide range of βγ values (0.1–10⁶), thus excluding nonrelativistic LIPs with βγ as small as 0.1 for the first time.

Additional Information

© 2021 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. (Received 18 November 2020; revised 11 June 2021; accepted 27 July 2021; published 18 August 2021) Funded by SCOAP3. 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.

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Published - PhysRevLett.127.081802.pdf

Accepted Version - 2011.09183.pdf

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