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Advances in High Energy Physics
Volume 2012 (2012), Article ID 349686, 15 pages
Research Article

Solar Neutrino Observables Sensitive to Matter Effects

1Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
2Institut de Física Corpuscular, CSIC, Universitat de València, Apartado de Correos 22085, E 46071 València, Spain

Received 25 July 2012; Accepted 1 October 2012

Academic Editor: Arthur B. McDonald

Copyright © 2012 H. Minakata and C. Peña-Garay. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We discuss constraints on the coefficient which is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos with the current and future solar neutrino data. The currently available solar neutrino data leads to a bound at 1 (3) CL, which is consistent with the Standard Model prediction . For weaker matter potential (), the constraint which comes from the flat 8B neutrino spectrum is already very tight, indicating the evidence for matter effects. However for stronger matter potential (), the bound is milder and is dominated by the day-night asymmetry of 8B neutrino flux recently observed by Super-Kamiokande. Among the list of observables of ongoing and future solar neutrino experiments, we find that (1) an improved precision of the day-night asymmetry of 8B neutrinos, (2) precision measurements of the low-energy quasi-monoenergetic neutrinos, and (3) the detection of the upturn of the 8B neutrino spectrum at low energies are the best choices to improve the bound on .