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Absence of day-night asymmetry of 862 keV Be-7 solar neutrino rate in Borexino and MSW oscillation parameters

Abstract : We report on a search for the day-night asymmetry of the Be-7 solar neutrino rate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows the absence of a significant asymmetry. This result alone rejects the so-called LOW solution at more than 8.5 sigma. Combined with the other solar neutrino data, it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190 without relying on the assumption of CPT symmetry in the neutrino sector. We also show that including the day-night asymmetry, data from Borexino alone restricts the MSW neutrino oscillations to the LMA solution at 90% confidence level.
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http://hal.in2p3.fr/in2p3-00659732
Contributor : Daniel Vignaud <>
Submitted on : Friday, January 13, 2012 - 3:08:38 PM
Last modification on : Saturday, September 19, 2020 - 4:51:49 AM

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G. Bellini, J. Benziger, D. Bick, S. Bonetti, G. Bonfini, et al.. Absence of day-night asymmetry of 862 keV Be-7 solar neutrino rate in Borexino and MSW oscillation parameters. Physics Letters B, Elsevier, 2012, 707, pp.22-26. ⟨10.1016/j.physletb.2011.11.025⟩. ⟨in2p3-00659732⟩

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