Search for MeV Electron Recoils from Dark Matter in EXO-200

Collaboration, EXO-200
:
Kharusi, S. Al
Anton, G.
Badhrees, I.
Barbeau, P. S.
Beck, D.
Belov, V.
Bhatta, T.
Breidenbach, M.
Brunner, T.
Cao, G. F.
Cen, W. R.
Chambers, C.
Cleveland, B.
Coon, M.
Craycraft, A.
Daniels, T.
Darroch, L.
Daugherty, S. J.
Davis, J.
Delaquis, S.
Der Mesrobian-Kabakian, A.
DeVoe, R.
Dilling, J.
Dolgolenko, A.
Dolinski, M. J.
Echevers, J.
Fairbank Jr., W.
Fairbank, D.
Farine, J.
Feyzbakhsh, S.
Fierlinger, P.
Fu, Y. S.
Fudenberg, D.
Gautam, P.
Gornea, R.
Gratta, G.
Hall, C.
Hansen, E. V.
Hoessl, J.
Hufschmidt, P.
Hughes, M.
Iverson, A.
Jamil, A.
Jessiman, C.
Jewell, M. J.
Johnson, A.
Karelin, A.
Kaufman, L. J.
Koffas, T.
Krücken, R.
Kuchenkov, A.
Kumar, K. S.
Lan, Y.
Larson, A.
Lenardo, B. G.
Leonard, D. S.
Li, G. S.
Li, S.
Li, Z.
Licciardi, C.
Lin, Y. H.
MacLellan, R.
McElroy, T.
Michel, T.
Mong, B.
Moore, D. C.
Murray, K.
Njoya, O.
Nusair, O.
Odian, A.
Ostrovskiy, I.
Perna, A.
Piepke, A.
Pocar, A.
Retière, F.
Robinson, A. L.
Rowson, P. C.
Ruddell, D.
Runge, J.
Schmidt, S.
Sinclair, D.
Skarpaas, K.
Soma, A. K.
Stekhanov, V.
Tarka, M.
Thibado, S.
Todd, J.
Tolba, T.
Totev, T. I.
Tsang, R. H. M.
Veenstra, B.
Veeraraghavan, V.
Vogel, P.
Vuilleumier, J. -L.
Wagenpfeil, M.
Watkins, J.
Wen, L. J.
Wichoski, U.
Wrede, G.
Wu, S. X.
Xia, Q.
Yahne, D. R.
Yang, L.
Yen, Y. -R.
Zeldovich, O. Ya.
Ziegler, T.

Publication date

July 2022

Abstract

We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron recoil background rate of $6.8 \times 10^{-4}\, \mathrm{cts}\,\mathrm{kg}^{-1}\mathrm{yr}^{-1}\mathrm{keV}^{-1}$ above $4\,\mathrm{MeV}$ and find no statistically significant excess over our background projection. Using a total ${}^{136}\mathrm{Xe}$ exposure of $234.1\,\mathrm{kg}\,\mathrm{yr}$ we exclude new parameter space for the charged-current absorption cross-section for dark matter masses between $m_\chi = 2.6\,\mathrm{MeV} - 11.6\,\mathrm{MeV}$ with a minimum of $6\times 10^{-51}\,\mathrm{cm}^2$ at $8.3\,\mathrm{MeV}$ at the $90\%$ confidence level.Comment: 9 pages,...