Constraints on scalar-pseudoscalar and tensorial nonstandard interactions and tensorial unparticle couplings from neutrino-electron scattering

Abstract

Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model, especially at the low energy-momentum transfer regime. We derived constraints on neutrino nonstardard interaction couplings depending on modelindependent approaches which are described by a four-Fermi pointlike interaction and unparticle physics model with tensorial components. Data onνe − e and νe − e scattering from the TEXONO and LSND experiments, respectively, are used. The upper limits and the allowed regions of scalar, pseudoscalar, and tensorial nonstandard interaction couplings of neutrinos are derived at 90% confidence level in both one-parameter and two-parameter analysis. New upper limits for tensorial unparticle physics coupling constants and mass parameters are also placed.

Searching for BSM neutrino interactions in dark matter detectors

“…The most extensively studied effective interactions are the Non-Standard Interactions (NSIs, reviewed in [1][2][3][4]) which lead to interesting phenomenology in neutrino oscillations. In addition, one can consider the most general four-fermion operators with all possible Lorentz invariant forms considered, including Scalar, Pseudoscalar, Vector, Axialvector, and Tensor (SPVAT) interactions [29,33,35,[63][64][65][66][67][68][69][70][71][72]. We will study the sensitivity of a 51 Cr-LXe experiment to both frameworks.…”

“…Therefore, searching for neutrino-electron BSM interactions is theoretically highly motivated and has been extensively studied in the literature [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. So far the most precise measurement for ν µ (ν µ )-e elastic scattering 1 , comes from the CHARM II experiment [45,46], which achieved a precision of 3%.…”

Probing light sterile neutrino signatures at reactor and Spallation Neutron Source neutrino experiments

“…A number of experiments are now planned in order to probe possible oscillation features due to the presence of sterile neutrinos. Specifically we examine the observation potential of the COHERENT experiment at Oak Ridge [59] and the TEXONO experiment in Taiwan [60,61]. Other relevant projects looking for this signature are the νGeN [62] and the GEMMA [63] experiments in Russia, as well as the CONNIE project in Brazil [64,65] and the MINER experiment at Texas A&M University [66].…”

Tensor and scalar interactions of neutrinos may lead to observable neutrino magnetic moments

“…Currently the effective coupling G X can be constrained by various elastic neutrino scattering data from CHARM II, LSND, TEXONO, Borexino, COHERENT, etc. In general, these experiments have G X sensitivity ranging from 0.1 to 1 G F [22,25,30,52], depending on the neutrino flavors, the charged fermion ψ, the specific forms of new interactions, etc. With these details involved and the uncertainties of theoretical predictions due to the UV incompleteness, here we refrain from more specific discussions and show merely two bands (red) of G X = 0.1 ∼ 1G F in Fig.…”

“…In addition to NSIs which are of the vector form (i.e. containing γ µ between ν and ν), recently there has been rising interest in more general interactions [10,[21][22][23][24][25][26][27][28][29][30][31][32] of scalar or tensor forms with the γ µ replaced by 1 or σ µν respectively 3 . From the theoretical point of view, the scalar or tensor interactions are as well motivated as the NSI, since they can all originate from integrating out some BSM bosons 4 .…”