Test of Electric Charge Conservation with Borexino.

@article{Agostini2015TestOE,
  title={Test of Electric Charge Conservation with Borexino.},
  author={M. Agostini and S. Appel and G. Bellini and J. Benziger and D. Bick and G. Bonfini and D. Bravo and B. Caccianiga and F. Calaprice and A. Caminata and P. Cavalcante and A. Chepurnov and D. D'angelo and S. Davini and A. Derbin and L. di Noto and I. Drachnev and A. Empl and A. {\'E}tenko and K. Fomenko and D. Franco and F. Gabriele and C. Galbiati and C. Ghiano and M. Giammarchi and M. Goeger-Neff and A. Goretti and M. Gromov and C. Hagner and E. Hungerford and A. Ianni and K. Jȩdrzejczak and M. Kaiser and V. Kobychev and D. Korablev and G. Korga and D. Kryn and M. Laubenstein and B. Lehnert and E. Litvinovich and F. Lombardi and P. Lombardi and L. Ludhova and G. Lukyanchenko and I. Machulin and S. Manecki and W. Maneschg and S. Marcocci and E. Meroni and M. Meyer and L. Miramonti and M. Misiaszek and M. Montuschi and P. Mosteiro and V. Muratova and B. Neumair and L. Oberauer and M. Obolensky and F. Ortica and K. Otis and M. Pallavicini and L. Papp and L. Perasso and A. Pocar and G. Ranucci and A. Razeto and A. Re and A. Romani and R. Roncin and N. Rossi and S. Sch{\"o}nert and D. Semenov and H. Simgen and M. Skorokhvatov and O. Smirnov and A. Sotnikov and S. Sukhotin and Y. Suvorov and R. Tartaglia and G. Testera and J. Thurn and M. Toropova and E. Unzhakov and A. Vishneva and R. Vogelaar and F. von Feilitzsch and H. Wang and S. Weinz and J. Winter and M. Wojcik and M. Wurm and Z. Yokley and O. Zaimidoroga and S. Zavatarelli and K. Zuber and G. Zuzel},
  journal={Physical review letters},
  year={2015},
  volume={115 23},
  pages={
          231802
        }
}
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 monoenergetic photon was obtained. This new bound, τ≥6.6×10^{28}  yr at 90% C.L., is 2 orders of magnitude better than the previous limit. 

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