Borexino and general neutrino interactions

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Right-handed neutrinos (νR) are often considered as a portal to new hidden physics. It is tempting to consider a gauge singlet scalar (ϕ) that exclusively couples to νR via a νRνRϕ term. Such a νR-philic scalar does not interact with charged fermions at tree level but loop-induced effective interactions are inevitable, which are systematically investigated in this work. The magnitude of the loop-induced couplings coincidentally meets the current sensitivity of fifth-force searches. In particular, the loop-induced coupling to muons could be tested in the recent LIGO observations of neutron star mergers as there might be a sizable Yukawa force in the binary system mediated by the νR-philic scalar.

Section: Phenomenologymentioning

confidence: 99%

The νR-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations

2020

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“…We thus take into account the constraints from the CHARM-II experiment [23,24] as well as reactor neutrino using TEXONO [25] data. The relevant data were used to study the electromagnetic interactions or the nonstandard vector-type interactions of a neutrino via the transition νe → νe [26][27][28][29][30][31]. The heavy neutral leptons as well as DM scattering off electrons can be also searched in high-energy neutrino beam-dump experiment or far-forward detector at the LHC [32,33].…”

Section: Jhep05(2021)131mentioning

confidence: 99%

“…The four-fermion operators are analogous to those in ref. [31]. Here the dimensionless parameters M α , E α , a α and˜ a α are in general complex.…”

Section: The General Neutrino Interactions With Exotic Fermion Via Neutrinoelectron Scatteringmentioning

confidence: 99%

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Constraints on general neutrino interactions with exotic fermion from neutrino-electron scattering experiments

Chen

Liao

2021

The couplings between the neutrinos and exotic fermion can be probed in both neutrino scattering experiments and dark matter direct detection experiments. We present a detailed analysis of the general neutrino interactions with an exotic fermion and electrons at neutrino-electron scattering experiments. We obtain the constraints on the coupling coefficients of the scalar, pseudoscalar, vector, axialvector, tensor and electromagnetic dipole interactions from the CHARM-II, TEXONO and Borexino experiments. For the flavor-universal interactions, we find that the Borexino experiment sets the strongest bounds in the low mass region for the electromagnetic dipole interactions, and the CHARM-II experiment dominates the bounds for other scenarios. If the interactions are flavor dependent, the bounds from the CHARM-II or TEXONO experiment can be avoided, and there are correlations between the flavored coupling coefficients for the Borexino experiment. We also discuss the detection of sub-MeV DM absorbed by bound electron targets and illustrate that the vector coefficients preferred by XENON1T data are allowed by the neutrino-electron scattering experiments.

“…The solar neutrino spectrum measured by Borexino in Phase II of the experimental program [27] gives us control over the e-NSI through EνES, while the COHERENT collaboration's open data release and observation of the CEνNS interaction at a CsI detector [28] provides sensitivity to the u and d quark NSI. Analyses have been performed with these data sets in both minimal NSI scenarios and for a broad range of operators [5,[29][30][31][32][33][34][35], but to explore the full space of NSI degeneracies we will allow an NSI set of maximum size to be free to vary, which has not been done before. Secondly, the stopped-pion spallation neutrino source (SNS) at COHERENT only produces ν e , ν µ , andν µ neutrinos, and with a short baseline to the detectors, there is negligible oscillation of the neutrino flux into τ flavors.…”

Section: Combining Oscillation Ceνns and Eνes Datamentioning

confidence: 99%

A global analysis strategy to resolve neutrino NSI degeneracies with scattering and oscillation data

Dutta

Lang

Liao

et al. 2020

Neutrino non-standard interactions (NSI) with the first generation of standard model fermions can span a parameter space of large dimension and exhibit degeneracies that cannot be broken by a single class of experiment. Oscillation experiments, together with neutrino scattering experiments, can merge their observations into a highly informational dataset to combat this problem. We consider combining neutrino-electron and neutrino-nucleus scattering data from the Borexino and COHERENT experiments, including a projection for the upcoming coherent neutrino scattering measurement at the CENNS-10 liquid argon detector. We extend the reach of these data sets over the NSI parameter space with projections for neutrino scattering at a future multi-ton scale dark matter detector and future oscillation measurements from atmospheric neutrinos at the Deep Underground Neutrino Experiment (DUNE). In order to perform this global anal- ysis, we adopt a novel approach using the copula method, utilized to combine posterior information from different experiments with a large, generalized set of NSI parameters. We find that the contributions from DUNE and a dark matter detector to the Borexino and COHERENT fits can improve constraints on the electron and quark NSI parameters by up to a factor of 2 to 3, even when relatively many NSI parameters are left free to vary in the analysis.