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      Nonstandard interactions and interference effect in low energy {\nu}_{e}e-scattering process

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          Abstract

          We calculated the size and sign of interference (I) in elastic {\nu}_{e}e-scattering process in the presence of nonstandard neutrino interactions (NSI). The size of interference predicted by standard model (SM) is -1.09, while that measured in the LSND experiment is -1.01\pm0.18. Using the current bounds on NSI from the literature,we get I= -1.02, which is compatible with experiment . The result indicates that nonstandard current interferes constructively with the charge and neutral currents (CC and NC) of the SM, while the over all -ev sign (distructive) indicates that the dominant contribution is still from the SM, yet we can not ignore the contribution of NSI, as it enhances our knowledge in terms of known physical phenomena. As an offshoot of this analysis, the best bounds on NSI coupling parameters could be chosen.

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          How sensitive is a neutrino factory to the angle \(\theta_{13}\)?

          We consider the impact of non-standard interactions of neutrinos (NSI) on the determination of neutrino mixing parameters at a neutrino factory using \(\pnu{e}\to\pnu{\mu}\) ``golden channels'' for the measurement of \(\theta_{13}\). We show how a small residual NSI leads to a drastic loss in sensitivity in \(\theta_{13}\), of up to two orders of magnitude. This can be somewhat overcome if two baselines are combined.
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            What can we learn from neutrino electron scattering?

            Precision tests of the standard model are essential for constraining models of new physics. Neutrino-electron elastic scattering offers a clean probe into many electroweak effects that are complimentary to the more canonical measurements done at collider facilities. Such reactions are rare, even as compared with the already tiny cross-sections for neutrino-nucleon scattering, and competitive precision measurements have historically been challenging to obtain. Due to new existing and proposed high-flux neutrino sources, this is about to change. We present a topical survey of precision measurements that can be done with neutrino-electron scattering in light of these new developments. Specifically, we consider four distinct neutrino sources: nuclear reactors, neutrino factories, beta-beams, and conventional beams. For each source we estimate the expected future precision of several representative observables, including the weak mixing angle, neutrino magnetic moments, and potential leptonic Z' couplings. We find that future neutrino-electron scattering experiments should add non-trivially to our understanding of fundamental physics.
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              Precision electroweak physics at high energies

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                Author and article information

                Journal
                17 January 2011
                2011-09-26
                Article
                1101.3191

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                6 pages
                hep-ph

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