Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 4 figures
Scientific paper
By using various solar neutrino observable we discuss constraints on the coefficient A_{MSW} which is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos. In the standard MSW theory A_{MSW}=1. The currently available solar neutrino data leads to a bound A_{MSW} = 1.32^{-0.70}_{+2.33} at 3\sigma CL. At weaker matter potentials (A_{MSW} < 1), the constraint, which comes from the flat 8B neutrino spectrum, is already very tight, indicating the evidence for matter effect based on the MSW theory, whereas in stronger matter potentials (A_{MSW} > 1) the bound is still quite loose. The presence of the upper bound itself is still remarkable, which is mostly due to the lack of too large day-night asymmetry in the 8B neutrino data. In the list of observable of ongoing and future solar neutrino experiments, we find that the detection of the upturn of the 8B neutrino spectrum at low energies, the precision measurements of the low energy quasi-monoenergetic neutrinos and the improved precision of the day-night asymmetry of 8B neutrinos are the best choices to improve the bound on A_{MSW}. Low energy solar neutrino measurements, 7Be and pep fluxes, accurate to better than 5% and 3% respectively, decrease the uncertainty in A_{MSW} at the same level as a future 2\sigma CL detection of the day-night asymmetry of the 8B neutrinos and more than the 3\sigma CL detection of the upturn of the 8B electron scattering spectra at low energies. If those accuracies can be reached, the uncertainty in the A_{MSW} determination can be reduced threefold at A_{MSW} > 1.
Minakata Hisakazu
Pena-Garay Carlos
No associations
LandOfFree
Solar Neutrino Observables Sensitive to Matter Effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Solar Neutrino Observables Sensitive to Matter Effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solar Neutrino Observables Sensitive to Matter Effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-275229