Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino data

M. Agostini , K. Altenmüller , S. Appel , V. Atroshchenko , Z. Bagdasarian , D. Basilico , G. Bellini , J. Benziger , D. Bick , G. Bonfini , D. Bravo , B. Caccianiga , F. Calaprice , A. Caminata , S. Caprioli , M. Carlini , P. Cavalcante , A. Chepurnov , K. Choi , L. Collica , D. d'Angelo , S. Davini , A. Derbin , X.F. Ding , A. Di Ludovico , L. Di Noto , I. Drachnev , K. Fomenko , A. Formozov , D. Franco (1) , F. Froborg , F. Gabriele , C. Galbiati , C. Ghiano , M. Giammarchi , A. Goretti , M. Gromov , D. Guffanti , C. Hagner , T. Houdy (1) , E. Hungerford , Aldo Ianni , Andrea Ianni , A. Jany , D. Jeschke , V. Kobychev , D. Korablev , G. Korga , D. Kryn (1) , M. Laubenstein , E. Litvinovich , F. Lombardi , P. Lombardi , L. Ludhova , G. Lukyanchenko , L. Lukyanchenko , I. Machulin , G. Manuzio , S. Marcocci , J. Martyn , E. Meroni , M. Meyer , L. Miramonti , M. Misiaszek , V. Muratova , B. Neumair , L. Oberauer , B. Opitz , V. Orekhov , F. Ortica , M. Pallavicini , L. Papp , Ö. Penek , N. Pilipenko , A. Pocar , A. Porcelli , G. Ranucci , A. Razeto , A. Re , M. Redchuk , A. Romani , R. Roncin , N. Rossi , S. Schönert , D. Semenov , M. Skorokhvatov , O. Smirnov , A. Sotnikov , L.F.F. Stokes , Y. Suvorov , R. Tartaglia , G. Testera , J. Thurn , M. Toropova , E. Unzhakov , A. Vishneva , R.B. Vogelaar , F. von Feilitzsch , H. Wang , S. Weinz , M. Wojcik , M. Wurm , Z. Yokley , O. Zaimidoroga , S. Zavatarelli , K. Zuber , G. Zuzel

1 APC (UMR_7164) - AstroParticule et Cosmologie

A search for the solar neutrino effective magnetic moment has been performed using data from 1291.5 days exposure during the second phase of the Borexino experiment. No significant deviations from the expected shape of the electron recoil spectrum from solar neutrinos have been found, and a new upper limit on the effective neutrino magnetic moment of μνeff<2.8×10-11 μB at 90% C.L. has been set using constraints on the sum of the solar neutrino fluxes implied by the radiochemical gallium experiments. Using the limit for the effective neutrino moment, new limits for the magnetic moments of the neutrino flavor states, and for the elements of the neutrino magnetic moments matrix for Dirac and Majorana neutrinos, are derived.

Mots clés: neutrino: solar; neutrino: magnetic moment; neutrino: Majorana; neutrino: moment; neutrino: flavor; electron: recoil; electron: energy spectrum; Borexino; gallium; upper limit; statistical analysis; experimental results; S066MGM

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]

M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, et al.. Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino data. Physical Review D, 2017, 96 (9), pp.091103. ⟨10.1103/PhysRevD.96.091103⟩. ⟨hal-01669660⟩