Light dark matter constraints from SuperCDMS HVeV detectors operated underground with an anticoincidence event selection
M. F. Albakry, I. Alkhatib, David Alonso-González, D. W. P. Amaral, J. Anczarski, T. Aralis, T. Aramaki, I. J. Arnquist, I. Ataee Langroudy, E. Azadbakht, C. Bathurst, R. Bhattacharyya, A. J. Biffl, P. L. Brink, M. L. Buchanan, R. Bunker, Blas Cabrera, R. Calkins, R. A. Cameron, C. Cartaro, D. G. Cerdeño, Y.-Y. Chang, M. Chaudhuri, J.-H. Chen, R. Chen, N. Chott, J. Cooley, H. Coombes, P. Cushman, R. Cyna, S. Das, F. De Brienne, S. Dharani, M. L. di Vacri, M. D. Diamond, M. Elwan, E. Fascione, E. Figueroa‐Feliciano, K. Fouts, M. Fritts, R. Germond, M. Ghaith, S. R. Golwala, J. Hall, S. A. S. Harms, K. Harris, N. Hassan, Z. Hong, E. W. Hoppe, L. Hsu, M. E. Huber, V. Iyer, D. Jardin, Varchaswi Kashyap, S. Keller, M. Kelsey, K. T. Kennard, A. Kubik, Noah Kurinsky, M. Lee, J. Leyva, J. Liu, Yihan Liu, B. Loer, E. Lopez Asamar, P. Lukens, D. B. MacFarlane, R. Mahapatra, J. S. Mammo, N. Mast, A. Mayer, H. Meyer Zu Theenhausen, É. Michaud, E. Michielin, N. Mirabolfathi, M. Mirzakhani, B. Mohanty, Diogo M. Souza Monteiro, J. Nelson, H. Neog, V. Novati, J. L. Orrell, M. D. Osborne, S. M. Oser, L. Pandey, S. Pandey, R. Partridge, D. S. Pedreros, Wen-Xi Peng, L. Perna, W. L. Perry, R. Podviianiuk, S. S. Poudel, A. Pradeep, M. Pyle, W. Rau, E. Reid, R Ren, T. Reynolds, Martín de los Rios
Abstract
This article presents constraints on dark-matter-electron interactions obtained from the first underground data-taking campaign with multiple SuperCDMS HVeV detectors operated in the same housing. An exposure of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mn>7.63</a:mn> <a:mtext> </a:mtext> <a:mtext> </a:mtext> <a:mi mathvariant="normal">g</a:mi> <a:mtext>−</a:mtext> <a:mi>days</a:mi> </a:mrow> </a:math> is used to set upper limits on the dark-matter-electron scattering cross section for dark matter masses between 0.5 and <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"> <d:mn>1000</d:mn> <d:mtext> </d:mtext> <d:mtext> </d:mtext> <d:mi>MeV</d:mi> <d:mo>/</d:mo> <d:msup> <d:mi>c</d:mi> <d:mn>2</d:mn> </d:msup> </d:math> , as well as upper limits on dark photon kinetic mixing and axionlike particle axioelectric coupling for masses between 1.2 and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"> <f:mn>23.3</f:mn> <f:mtext> </f:mtext> <f:mtext> </f:mtext> <f:mi>eV</f:mi> <f:mo>/</f:mo> <f:msup> <f:mi>c</f:mi> <f:mn>2</f:mn> </f:msup> </f:math> . Compared to an earlier HVeV search, sensitivity was improved as a result of an increased overburden of 225 meters of water equivalent, an anticoincidence event selection, and better pile-up rejection. In the case of dark-matter-electron scattering via a heavy mediator, an improvement by up to a factor of 25 in cross section sensitivity was achieved.