Simultaneous Precision Spectroscopy of $pp$, $^7$Be, and $pep$ Solar Neutrinos with Borexino Phase-II
Creators: name: Agostini, M.
name: Altenmuller, K.
name: Appel, S.
name: Atroshchenko, V.
name: Bagdasarian, Z.
name: Basilico, D.
name: Bellini, G.
name: Benziger, J.
name: Bick, D.
name: Bonfini, G.
name: Bravo, D.
name: Caccianiga, B.
name: Calaprice, F.
name: Caminata, A.
name: Caprioli, S.
name: Carlini, M.
name: Cavalcante, P.
name: Chepurnov, A.
name: Choi, K.
name: Collica, L.
name: D'Angelo, D.
name: Davini, S.
name: Derbin, A.
name: Ding, X. F.
name: Di Ludovico, A.
name: Di Noto, L.
name: Drachnev, I.
name: Fomenko, K.
name: Formozov, A.
name: Franco, D.
name: Froborg, F.
name: Gabriele, F.
name: Galbiati, C.
name: Ghiano, C.
name: Giammarchi, M.
name: Goretti, A.
name: Gromov, M.
name: Guffanti, D.
name: Hagner, C.
name: Houdy, T.
name: Hungerford, E.
name: Ianni, Aldo
name: Ianni, Andrea
name: Jany, A.
name: Jeschke, D.
name: Kobychev, V.
name: Korablev, D.
name: Korga, G.
name: Kryn, D.
name: Laubenstein, M.
name: Litvinovich, E.
name: Lombardi, F.
name: Lombardi, P.
name: Ludhova, L.
name: Lukyanchenko, G.
name: Lukyanchenko, L.
name: Machulin, I.
name: Manuzio, G.
name: Marcocci, S.
name: Martyn, J.
name: Meroni, E.
name: Meyer, M.
name: Miramonti, L.
name: Misiaszek, M.
name: Muratova, V.
name: Neumair, B.
name: Oberauer, L.
name: Opitz, B.
name: Orekhov, V.
name: Ortica, F.
name: Pallavicini, M.
name: Papp, L.
name: Penek, O.
name: Pilipenko, N.
name: Pocar, A.
name: Porcelli, A.
name: Ranucci, G.
name: Razeto, A.
name: Re, A.
name: Redchuk, M.
name: Romani, A.
name: Roncin, R.
name: Rossi, N.
name: Schonert, S.
name: Semenov, D.
name: Skorokhvatov, M.
name: Smirnov, O.
name: Sotnikov, A.
name: Stokes, L. F. F.
name: Suvorov, Y.
name: Tartaglia, R.
name: Testera, G.
name: Thurn, J.
name: Toropova, M.
name: Unzhakov, E.
name: Vishneva, A.
name: Vogelaar, R. B.
name: von Feilitzsch, F.
name: Wang, H.
name: Weinz, S.
name: Wojcik, M.
name: Wurm, M.
name: Yokley, Z.
name: Zaimidoroga, O.
name: Zavatarelli, S.
name: Zuber, K.
name: Zuzel, G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present the first simultaneous measurement of the interaction rates of $pp$, $^7$Be, and $pep$ solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93)$\,$MeV. This result was obtained by analyzing 1291.51$\,$days of Borexino Phase-II data, collected between December 2011 and May 2016 after an extensive scintillator purification campaign. We find: rate($pp$)$\,$=$\,$$134$$\,$$\pm$$\,$$10$$\,$($stat$)$\,$$^{\rm +6}_{\rm -10}$$\,$($sys$)$\,$cpd/100$\,$t, rate($^7$Be)$\,$=$\,$$48.3$$\,$$\pm$$\,$$1.1$$\,$($stat$)$\,$$^{\rm +0.4}_{\rm -0.7}$$\,$($sys$)$\,$cpd/100$\,$t, and rate($pep$)$\,$=$\,$$2.43$$\pm$$\,$$0.36$$\,$($stat$)$^{+0.15}_{-0.22}$$\,$($sys$)$\,$cpd/100$\,$t. These numbers are in agreement with and improve the precision of our previous measurements. In particular, the interaction rate of $^7$Be $ν$'s is measured with an unprecedented precision of 2.7%, showing that discriminating between the high and low metallicity solar models is now largely dominated by theoretical uncertainties. The absence of $pep$ neutrinos is rejected for the first time at more than 5$\,$$σ$. An upper limit of $8.1$$\,$cpd/100$\,$t (95%$\,$C.L.) on the CNO neutrino rate is obtained by setting an additional constraint on the ratio between the $pp$ and $pep$ neutrino rates in the fit. This limit has the same significance as that obtained by the Borexino Phase-I (currently providing the tightest bound on this component), but is obtained by applying a less stringent constraint on the $pep$ $ν$ flux.
description: 8 pages, 7 figures