2 research outputs found
Solar Neutrinos Before and After KamLAND
We use the recently reported KamLAND measurements on oscillations of reactor
anti-neutrinos, together with the data of previously reported solar neutrino
experiments, to show that: (1) the total 8B neutrino flux emitted by the Sun is
1.00(1.0 \pm 0.06) of the standard solar model (BP00) predicted flux, (2) the
KamLAND measurements reduce the area of the globally allowed oscillation
regions that must be explored in model fitting by six orders of magnitude in
the Delta m^2-tan^2 theta plane, (3) LMA is now the unique oscillation solution
to a CL of 4.7sigma, (4) maximal mixing is disfavored at 3.1 sigma, (5)
active-sterile admixtures are constrained to sin^2 eta<0.13 at 1 sigma, (6) the
observed ^8B flux that is in the form of sterile neutrinos is
0.00^{+0.09}_{-0.00} (1 sigma), of the standard solar model (BP00) predicted
flux, and (7) non-standard solar models that were invented to completely avoid
solar neutrino oscillations are excluded by KamLAND plus solar at 7.9 sigma .
We also refine quantitative predictions for future 7Be and p-p solar neutrino
experiments.Comment: Published version, includes editorial improvement
Present and Future Bounds on Non-Standard Neutrino Interactions
We consider Non-Standard neutrino Interactions (NSI), described by
four-fermion operators of the form , where is an electron or first generation quark. We
assume these operators are generated at dimension , so the related
vertices involving charged leptons, obtained by an SU(2) transformation
, do not appear at tree level. These related
vertices necessarily arise at one loop, via exchange. We catalogue current
constraints from measurements in neutrino scattering, from
atmospheric neutrino observations, from LEP, and from bounds on the related
charged lepton operators. We estimate future bounds from comparing KamLAND and
solar neutrino data, and from measuring at the near detector
of a neutrino factory. Operators constructed with and should
not confuse the determination of oscillation parameters at a factory,
because the processes we consider are more sensitive than oscillations at the
far detector. For operators involving , we estimate similar
sensitivities at the near and far detector.Comment: Erratum added at the end of the documen