Abstract
We discuss the possibility of a precision measurement of the electroweak mixing angle and a probe for new physics in the leptonic process of neutrino electron scattering. In the new physics schemes we explore the case of non standard neutrino interactions (NSI). The LENA proposal, currently under discussion, considers a large detector and the use of an artificial, 51Cr, radioactive neutrino source with of 5 MCi intensity. We also discuss the possible use of the solar neutrino flux as a neutrino source, in particular the case of the 7Be emission line.
Highlights
The evidence of neutrino oscillations reveal the implication of massive neutrinos, this fact can be acknowledged as the first evidence of new physics beyond the Standard Model [1, 2]
As an application of that kind of source: (A) the precise determination of the electroweak mixing by measuring the neutrino electron differential cross section and (B) the sensitivity to new physics such as non-standard interactions (NSI) and/or additional neutral gauge bosons
To illustrate the physics potential of LENA to this type of new physics we focus on the sensitivity to non universal NSI parameters for the interaction of neutrinos with electrons, a similar analysis could be done for the flavor changing NSI parameters
Summary
The evidence of neutrino oscillations reveal the implication of massive neutrinos, this fact can be acknowledged as the first evidence of new physics beyond the Standard Model [1, 2]. The coupling constants for the Eq (1) will be modified to gR → gR + εRee and gL → gL + εLee. After performing an idealistic statistical analysis, similar as the one explained, we find that for a 5% error in the measured event number per bin the constraint on εLee would be below a few percent, while for the case of a 1% error the constraint on this parameter will lie below the percent level, in Fig. 3 we compare the estimated sensitivity to the NSI parameters attainable by LENA with previous limits from reactor and solar neutrino data. The LENA proposal has potential to restrict models with trilinear R -parity violating couplings [21]
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