Journal
PHYSICS LETTERS B
Volume 707, Issue 1, Pages 22-26Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2011.11.025
Keywords
Solar neutrinos; Day-night effect; CPT violation; Neutrino oscillations
Funding
- INFN
- MIUR (Italy)
- NSF (USA)
- BMBF
- DFG
- MPG (Germany)
- NRC Kurchatov Institute (Russia)
- MNiSW (Poland)
- Laboratori Nazionali del Gran Sasso
- Direct For Mathematical & Physical Scien
- Division Of Physics [0802114] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0902140, 1103987] Funding Source: National Science Foundation
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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.
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