Search for neutron-Antineutron oscillations at the Sudbury Neutrino Observatory

Authors

B. Aharmim, Laurentian University
S. N. Ahmed, Queen’s University
A. E. Anthony, The University of Texas at Austin
N. Barros, Laboratório de Instrumentacao e Física Experimental de Partículas
E. W. Beier, University of Pennsylvania
A. Bellerive, Carleton University
B. Beltran, University of Alberta
M. Bergevin, University of Guelph
S. D. Biller, University of Oxford
K. Boudjemline, Carleton University
M. G. Boulay, Queen’s University
B. Cai, Queen’s University
Y. D. Chan, Lawrence Berkeley National Laboratory
D. Chauhan, Laurentian University
M. Chen, Queen’s University
B. T. Cleveland, University of Oxford
G. A. Cox, University of Washington
X. Dai, Carleton University
H. Deng, University of Pennsylvania
J. A. Detwiler, Lawrence Berkeley National Laboratory
P. J. Doe, University of Washington
G. Doucas, University of Oxford
P. L. Drouin, Carleton University
F. A. Duncan, Queen’s University
M. Dunford, University of Pennsylvania
E. D. Earle, Queen’s University
S. R. Elliott, Los Alamos National Laboratory
H. C. Evans, Queen’s University

Document Type

Article

Publication Date

11-20-2017

Abstract

Tests on B-L symmetry breaking models are important probes to search for new physics. One proposed model with Δ(B-L)=2 involves the oscillations of a neutron to an antineutron. In this paper, a new limit on this process is derived for the data acquired from all three operational phases of the Sudbury Neutrino Observatory experiment. The search concentrated on oscillations occurring within the deuteron, and 23 events were observed against a background expectation of 30.5 events. These translated to a lower limit on the nuclear lifetime of 1.48×1031 yr at 90% C.L. when no restriction was placed on the signal likelihood space (unbounded). Alternatively, a lower limit on the nuclear lifetime was found to be 1.18×1031 yr at 90% C.L. when the signal was forced into a positive likelihood space (bounded). Values for the free oscillation time derived from various models are also provided in this article. This is the first search for neutron-Antineutron oscillation with the deuteron as a target.

Publication Source (Journal or Book title)

Physical Review D

Recommended Citation

Aharmim, B., Ahmed, S., Anthony, A., Barros, N., Beier, E., Bellerive, A., Beltran, B., Bergevin, M., Biller, S., Boudjemline, K., Boulay, M., Cai, B., Chan, Y., Chauhan, D., Chen, M., Cleveland, B., Cox, G., Dai, X., Deng, H., Detwiler, J., Doe, P., Doucas, G., Drouin, P., Duncan, F., Dunford, M., Earle, E., Elliott, S., & Evans, H. (2017). Search for neutron-Antineutron oscillations at the Sudbury Neutrino Observatory. Physical Review D, 96 (9) https://doi.org/10.1103/PhysRevD.96.092005