A test of electric charge conservation with Borexino
Borexino Collaboration: M. Agostini, S. Appel, G. Bellini, J., Benziger, D. Bick, G. Bonfini, D. Bravo, B. Caccianiga, F. Calaprice, A., Caminata, P. Cavalcante, A. Chepurnov, D. D'Angelo, S. Davini, A. Derbin, L., Di Noto, I. Drachnev, A. Empl, A. Etenko, K. Fomenko, D. Franco
TL;DR
This paper reports a new, significantly improved experimental limit on the stability of the electron, testing electric charge conservation using the Borexino detector's low-background capabilities.
Contribution
The study provides the most stringent experimental limit to date on electron decay, enhancing constraints on charge conservation.
Findings
New lower bound on electron lifetime: >6.6×10^28 years
Improved sensitivity due to Borexino's radio-purity and detector response
Results strengthen the validity of electric charge conservation
Abstract
Borexino is a liquid scintillation detector located deep underground at the Laboratori Nazionali del Gran Sasso (LNGS, Italy). Thanks to the unmatched radio-purity of the scintillator, and to the well understood detector response at low energy, a new limit on the stability of the electron for decay into a neutrino and a single mono-energetic photon was obtained. This new bound, tau > 6.6 10**28 yr at 90 % C.L., is two orders of magnitude better than the previous limit.
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