/ nucl-ex arXiv:1612.00886

New limits on bosonic dark matter, solar axions, Pauli Exclusion Principle violation, and electron decay from the low-energy spectrum of the MAJORANA DEMONSTRATOR

Abgrall, N. (LBNL, NSD) ; Arnquist, I.J. (PNL, Richland) ; Avignone, F.T., III (Oak Ridge) ; Barabash, A.S. (Moscow, ITEP) ; Bertrand, F.E. (Oak Ridge) ; Bradley, A.W. (LBNL, NSD) ; Brudanin, V. (Dubna, JINR) ; Busch, M. (TUNL, Durham) ; Buuck, M. (Washington U., Seattle) ; Caldwell, T.S. (TUNL, Durham) ; Chan, Y-D. (LBNL, NSD) ; Christofferson, C.D. (South Dakota Sch. Mines Tech.) ; Chu, P.-H. (Los Alamos) ; Cuesta, C. (Washington U., Seattle) ; Detwiler, J.A. (Washington U., Seattle) ; Dunagan, C. (South Dakota Sch. Mines Tech.) ; Efremenko, Yu. (Tennessee U.) ; Ejiri, H. (Osaka U., Res. Ctr. Nucl. Phys.) ; Elliott, S.R. (Los Alamos) ; Gilliss, T. (TUNL, Durham) ; Giovanetti, G.K. (Princeton U.) ; Goett, J. (Los Alamos) ; Green, M.P. (Oak Ridge) ; Gruszko, J. (Washington U., Seattle) ; Guinn, I.S. (Washington U., Seattle) ; Guiseppe, V.E. (South Carolina U.) ; Haufe, C.R.S. (TUNL, Durham) ; Henning, R. (TUNL, Durham) ; Hoppe, E.W. (PNL, Richland) ; Howard, S. (South Dakota Sch. Mines Tech.) ; Howe, M.A. (TUNL, Durham) ; Jasinski, B.R. (South Dakota U.) ; Keeter, K.J. (Black Hills State U.) ; Kidd, M.F. (Tennessee Tech. U.) ; Konovalov, S.I. (Moscow, ITEP) ; Kouzes, R.T. (PNL, Richland) ; Lopez, A.M. (Tennessee U.) ; MacMullin, J. (TUNL, Durham) ; Martin, R.D. (Queen's U., Kingston) ; Massarczyk, R. (Los Alamos) ; Meijer, S.J. (TUNL, Durham) ; Mertens, S. (Munich, Tech. U., Universe) ; O'Shaughnessy, C. (TUNL, Durham) ; Poon, A.W.P. (LBNL, NSD) ; Radford, D.C. (Oak Ridge) ; Rager, J. (TUNL, Durham) ; Reine, A.L. (TUNL, Durham) ; Rielage, K. (Los Alamos) ; Robertson, R.G.H. (Washington U., Seattle) ; Shanks, B. (TUNL, Durham) ; Shirchenko, M. (Dubna, JINR) ; Suriano, A.M. (South Dakota Sch. Mines Tech.) ; Tedeschi, D. (South Carolina U.) ; Trimble, J.E. (TUNL, Durham) ; Varner, R.L. (Oak Ridge) ; Vasilyev, S. (Dubna, JINR) ; Vetter, K. (Los Alamos) ; Vorren, K. (Los Alamos) ; White, B.R. (Los Alamos) ; Wilkerson, J.F. (North Carolina U.) ; Wiseman, C. (South Carolina U.) ; Xu, W. (South Dakota U.) ; Yakushev, E. (Dubna, JINR) ; Yu, C.-H. (Oak Ridge) ; Yumatov, V. (Moscow, ITEP) ; Zhitnikov, I. (Dubna, JINR) ; Zhu, B.X. (Los Alamos)

Abstract: The existence of cosmic dark matter (DM) is well established but its exact nature has yet to be determined. Stringent limits on weakly interacting massive particle (WIMP) DM candidates motivate alternative models. We present results for searches of keV-scale pseudoscalar and vector dark matter using 478 kg d of commissioning data from the MAJORANA DEMONSTRATOR (MJD), a Ge-based neutrinoless double-beta decay experiment operating in the Sanford Underground Research Facility. We did not detect a positive dark matter signal, and a 90\% upper confidence interval on the electron DM coupling was estimated. Our most stringent limit on DM coupling was set for axion-like particles of mass 11.8 keV with g$_{Ae} <$ 4.5 $\times 10^{-13}$, and $\frac{\alpha'}{\alpha} < 9.7 \times 10^{-28}$ for vector DM. We also report limits from additional rare-event searches, including 14.4~keV solar axions and Pauli Exclusion Principle violating electron transitions. An upper limit of $g_{AN}^{eff} \times g_{Ae} < 3.8 \times 10^{-17}$ was found for the solar axion coupling; a limit on the strength of a non-Paulian transition in Ge of $\frac{1}{2}\beta^2 < 8.5\times10^{-48}$ was set, and a limit of $\tau_e > 1.2 \times 10^{24}$ y for $e^- \rightarrow \nu\bar{\nu}\nu$ was found at the 90% confidence level.

Web-Page: http://inspirehep.net/record/1501729/files/alpDM_9Nov16.png; http://inspirehep.net/record/1501729/files/vecDM_1Dec16.png; http://inspirehep.net/record/1501729/files/tritium_1Dec16.png; http://inspirehep.net/record/1501729/files/hadronic16Nov16.png; http://inspirehep.net/record/1501729/files/arXiv:1612.00886.pdf

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