EPJ Web of Conferences (Jan 2019)
Search for neutron dark decay: n → χ + e+e−
- Sun X.,
- Adamek E.,
- Allgeier B.,
- Blatnik M.,
- Bowles T.J.,
- Broussard L.J.,
- Brown M.A.-P.,
- Carr R.,
- Clayton S.,
- Cude-Woods C.,
- Currie S.,
- Dees E.B.,
- Ding X.,
- Filippone B.W.,
- García A.,
- Geltenbort P.,
- Hasan S.,
- Hickerson K.P.,
- Hoagland J.,
- Hong R.,
- Hogan G.E.,
- Holley A.T.,
- Ito T.M.,
- Kneckt A.,
- Liu C.-Y.,
- Liu J.,
- Makela M.,
- Mammei R.,
- Martin J.W.,
- Melconian D.,
- Mendenhall M.P.,
- Moore S.D.,
- Morris C.L.,
- Nepal S.,
- Nouri N.,
- Pattie R.W.,
- Galván A.P.,
- Phillips II D.G.,
- Picker R.,
- Pitt M.L.,
- Plaster B.,
- Ramsey J.C.,
- Rios R.,
- Salvat D.J.,
- Saunders A.,
- Sondheim W.,
- Sjue S.,
- Slutsky S.,
- Swank C.,
- Swift G.,
- Tatar E.,
- Vogelaar R.B.,
- VornDick B.,
- Wanchun W.,
- Wang Z.,
- Wexler J.,
- Womack T.,
- Wrede C.,
- Young A.R.,
- Zeck B.A.
Affiliations
- Sun X.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Adamek E.
- Department of Physics, Indiana University
- Allgeier B.
- Department of Physics and Astronomy, University of Kentucky
- Blatnik M.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Bowles T.J.
- Los Alamos National Laboratory
- Broussard L.J.
- Los Alamos National Laboratory
- Brown M.A.-P.
- Department of Physics and Astronomy, University of Kentucky
- Carr R.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Clayton S.
- Los Alamos National Laboratory
- Cude-Woods C.
- Department of Physics, North Carolina State University
- Currie S.
- Los Alamos National Laboratory
- Dees E.B.
- Ding X.
- Department of Physics, Virginia Tech
- Filippone B.W.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- García A.
- Department of Physics and Center for Experimental Nuclear Physics and Astrophysics, University of Washington
- Geltenbort P.
- Institut Laue-Langevin
- Hasan S.
- Department of Physics and Astronomy, University of Kentucky
- Hickerson K.P.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Hoagland J.
- Department of Physics, North Carolina State University
- Hong R.
- Department of Physics and Center for Experimental Nuclear Physics and Astrophysics, University of Washington
- Hogan G.E.
- Los Alamos National Laboratory
- Holley A.T.
- Ito T.M.
- Los Alamos National Laboratory
- Kneckt A.
- Department of Physics and Center for Experimental Nuclear Physics and Astrophysics, University of Washington
- Liu C.-Y.
- Department of Physics, Indiana University
- Liu J.
- Department of Physics, Shanghai Jiao Tong University
- Makela M.
- Los Alamos National Laboratory
- Mammei R.
- Department of Physics, University of Winnipeg
- Martin J.W.
- Melconian D.
- Cyclotron Institute, Texas A&M University, College Station
- Mendenhall M.P.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Moore S.D.
- Department of Physics, North Carolina State University
- Morris C.L.
- Los Alamos National Laboratory
- Nepal S.
- Department of Physics and Astronomy, University of Kentucky
- Nouri N.
- Department of Physics and Astronomy, University of Kentucky
- Pattie R.W.
- Galván A.P.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Phillips II D.G.
- Department of Physics, North Carolina State University
- Picker R.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Pitt M.L.
- Department of Physics, Virginia Tech
- Plaster B.
- Department of Physics and Astronomy, University of Kentucky
- Ramsey J.C.
- Los Alamos National Laboratory
- Rios R.
- Salvat D.J.
- Department of Physics and Center for Experimental Nuclear Physics and Astrophysics, University of Washington
- Saunders A.
- Los Alamos National Laboratory
- Sondheim W.
- Los Alamos National Laboratory
- Sjue S.
- Los Alamos National Laboratory
- Slutsky S.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Swank C.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Swift G.
- Triangle Universities Nuclear Laboratory
- Tatar E.
- Department of Physics, Idaho State University
- Vogelaar R.B.
- Department of Physics, Virginia Tech
- VornDick B.
- Department of Physics, North Carolina State University
- Wanchun W.
- W.K. Kellogg Radiation Laboratory, California Institute of Technology
- Wang Z.
- Los Alamos National Laboratory
- Wexler J.
- Department of Physics, North Carolina State University
- Womack T.
- Los Alamos National Laboratory
- Wrede C.
- Young A.R.
- Zeck B.A.
- Department of Physics, North Carolina State University
- DOI
- https://doi.org/10.1051/epjconf/201921905008
- Journal volume & issue
-
Vol. 219
p. 05008
Abstract
In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. One of the possible final states discussed includes a single χ along with an e+e− pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with ∼ 4π acceptance using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). We use the timing information of coincidence events to select candidate dark sector particle decays by applying a timing calibration and selecting events within a physically-forbidden timing region for conventional n → p + e- + ν̅e decays. The summed kinetic energy (Ee+e−) from such events is reconstructed and used to set limits, as a function of the χ mass, on the branching fraction for this decay channel.
