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Absence of a day-night asymmetry in the Be-7 solar neutrino rate in Borexino

Author(s): Bellini, G; Benziger, Jay B.; Bick, D; Bonetti, S; Bonfini, G; et al

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Abstract: We report the result of a search for a day-night asymmetry in the Be-7 solar neutrino interaction rate in the Borexino detector at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The measured asymmetry is A(dn) = 0.001 +/- 0.012 (stat) +/- 0.007 (syst), in agreement with the prediction of MSW-LMA solution for neutrino oscillations. This result disfavors MSW oscillations with mixing parameters in the LOW region at more than 8.5 sigma. This region is, for the first time, strongly disfavored without the use of reactor anti-neutrino data and therefore the assumption of CPT symmetry. The result can also be used to constrain some neutrino oscillation scenarios involving new physics. (C) 2011 Elsevier B.V. All rights reserved.
Publication Date: 16-Jan-2012
Electronic Publication Date: 25-Nov-2011
Citation: Bellini, G, Benziger, J, Bick, D, Bonetti, S, Bonfini, G, Avanzini, M Buizza, Caccianiga, B, Cadonati, L, Calaprice, F, Carraro, C, Cavalcante, P, Chavarria, A, D Angelo, D, Davini, S, Derbin, A, Etenko, A, von Feilitzsch, F, Fomenko, K, Franco, D, Galbiati, C, Gazzana, S, Ghiano, C, Giammarchi, M, Goeger-Neff, M, Goretti, A, Grandi, L, Guardincerri, E, Hardy, S, Ianni, Aldo, Ianni, Andrea, Kobychev, V, Korablev, D, Korga, G, Koshio, Y, Kryn, D, Laubenstein, M, Lewke, T, Litvinovich, E, Loer, B, Lombardi, P, Lombardi, F, Ludhova, L, Machulin, I, Manecki, S, Maneschg, W, Manuzio, G, Meindl, Q, Meroni, E, Miramonti, L, Misiaszek, M, Montanari, D, Mosteiro, P, Muratova, V, Oberauer, L, Obolensky, M, Ortica, F, Pallavicini, M, Papp, L, Pena-Garay, C, Perasso, L, Perasso, S, Pocar, A, Raghavan, RS, Ranucci, G, Razeto, A, Re, A, Romani, A, Sabelnikov, A, Saldanha, R, Salvo, C, Schoenert, S, Simgen, H, Skorokhvatov, M, Smirnov, O, Sotnikov, A, Sukhotin, S, Suvorov, Y, Tartaglia, R, Testera, G, Vignaud, D, Vogelaar, RB, Winter, J, Wojcik, M, Wright, A, Wurm, M, Xu, J, Zaimidoroga, O, Zavatarelli, S, Zuzel, G. (2012). Absence of a day-night asymmetry in the Be-7 solar neutrino rate in Borexino. PHYSICS LETTERS B, 707 (22 - 26. doi:10.1016/j.physletb.2011.11.025
DOI: doi:10.1016/j.physletb.2011.11.025
ISSN: 0370-2693
EISSN: 1873-2445
Pages: 22 - 26
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICS LETTERS B
Version: Author's manuscript

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