Neutrino scattering and B anomalies from hidden sector portals (original) (raw)

Global constraints on non-standard neutrino interactions with quarks and electrons

Journal of High Energy Physics

We derive new constraints on effective four-fermion neutrino non-standard interactions with both quarks and electrons. This is done through the global analysis of neutrino oscillation data and measurements of coherent elastic neutrino-nucleus scattering (CEνNS) obtained with different nuclei. In doing so, we include not only the effects of new physics on neutrino propagation but also on the detection cross section in neutrino experiments which are sensitive to the new physics. We consider both vector and axial-vector neutral-current neutrino interactions and, for each case, we include simultaneously all allowed effective operators in flavour space. To this end, we use the most general parametrization for their Wilson coefficients under the assumption that their neutrino flavour structure is independent of the charged fermion participating in the interaction. The status of the LMA-D solution is assessed for the first time in the case of new interactions taking place simultaneously wi...

Probing nonstandard neutrino interactions at the LHC Run II

Physics Letters B, 2018

Searching for non-standard neutrino interactions, as a means for discovering physics beyond the Standard Model, has been one of the key goals of dedicated neutrino experiments, current and future. This has received recent fillip in the wake of reported anomalies in leptonic B-decays. We demonstrate here that much of the parameter space accessible to such dedicated neutrino experiments is already ruled out by the RUN II data of the Large Hadron Collider experiment.

Constraining nonstandard neutrino-quark interactions with solar, reactor, and accelerator data

Physical Review D, 2009

We present a reanalysis of nonstandard neutrino-down-quark interactions of electron and tau neutrinos using solar, reactor and accelerator data. In addition updating the analysis by including new solar data from SNO phase III and Borexino, as well as new KamLAND data and solar fluxes, a key role is played in our analysis by the combination of these results with the CHARM data. The latter allows us to better constrain the axial and axial-vector electron and tau-neutrino nonstandard interaction parameters characterizing the deviations from the Standard Model predictions.

Probing the nature of neutrinos with a new force

Physical Review D, 2020

We discuss the possibility to distinguish between Dirac and Majorana neutrinos in the context of the minimal gauge theory for neutrino masses, the B − L gauge extension of the Standard Model. We revisit the possibility to observe lepton number violation at the Large Hadron Collider and point out the importance of the decays of the new gauge boson to discriminate between the existence of Dirac or Majorana neutrinos.

Present and future bounds on non-standard neutrino interactions

Journal of High Energy Physics, 2003

We consider Non-Standard neutrino Interactions (NSI), described by four-fermion operators of the form (ναγν β )(f γf ), where f is an electron or first generation quark. We assume these operators are generated at dimension ≥ 8, so the related vertices involving charged leptons, obtained by an SU (2) transformation ν δ → e δ , do not appear at tree level. These related vertices necessarily arise at one loop, via W exchange. We catalogue current constraints from sin 2 θW 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 sin 2 θW at the near detector of a neutrino factory. Operators constructed with νµ and νe should not confuse the determination of oscillation parameters at a νfactory, because the processes we consider are more sensitive than oscillations at the far detector. For operators involving ντ , we estimate similar sensitivities at the near and far detector. * Reference [9] found that NSI induced in the R-parity violating MSSM could not explain the solar neutrino deficit. However, their operators were otherwise constrained to be at least an order of magnitude smaller than the solutions found in .

Hidden-sector neutrinos and freeze-in leptogenesis

Physical review, 2022

Sterile neutrinos at the GeV scale can resolve several outstanding problems of the Standard Model (SM), such as the source of neutrino masses and the origin of the baryon asymmetry through freeze-in leptogenesis. However, they can be challenging to detect experimentally due to their small couplings to SM particles. In extensions of the SM with new interactions of the sterile neutrinos, they can be produced copiously at accelerators and colliders. We systematically investigate the impact of such novel interactions on the asymmetry from freeze-in leptogenesis. We find that the interactions tend to bring the sterile neutrinos into equilibrium at early times, leading to a significant reduction in the generated asymmetry. We also show that observable rates of several hidden-sector neutrino signatures, such as SM Higgs decays to pairs of sterile neutrinos, can be inconsistent with the observed baryon asymmetry and provide an opportunity to falsify freeze-in leptogenesis.

Probing neutrino properties with charged scalar lepton decays

Physical Review D, 2002

Supersymmetry with bilinear R-parity violation provides a predictive framework for neutrino masses and mixings in agreement with current neutrino oscillation data. The model leads to striking signals at future colliders through the R-parity violating decays of the lightest supersymmetric particle. Here we study charged scalar lepton decays and demonstrate that if the scalar tau is the LSP (i) it will decay within the detector, despite the smallness of the neutrino masses, (ii) the relative ratio of branching ratios Br(τ 1 → e ν i )/Br(τ 1 → µ ν i ) is predicted from the measured solar neutrino angle, and (iii) scalar muon and scalar electron decays will allow to test the consistency of the model. Thus, bilinear R-parity breaking SUSY will be testable at future colliders also in the case where the LSP is not the neutralino.

Probing non-standard neutrino interactions at neutrino factories

Journal of Physics: Conference Series, 2008

Lepton number violation interactions and their effects on neutrino oscillation experiments

Physical Review D, 2000

Mixing between bosons that transform differently under the standard model gauge group, but identically under its unbroken subgroup, can induce interactions that violate the total lepton number. We discuss four-fermion operators that mediate lepton number violating neutrino interactions both in a model-independent framework and within supersymmetry (SUSY) without R-parity. The effective couplings of such operators are constrained by: i) the upper bounds on the relevant elementary couplings between the bosons and the fermions, ii) by the limit on universality violation in pion decays, iii) by the data on neutrinoless double beta decay and, iv) by loop-induced neutrino masses. We find that the present bounds imply that lepton number violating neutrino interactions are not relevant for the solar and atmospheric neutrino problems. Within SUSY without R-parity also the LSND anomaly cannot be explained by such interactions, but one cannot rule out an effect modelindependently. Possible consequences for future terrestrial neutrino oscillation experiments and for neutrinos from a supernova are discussed. II. FORMALISM Consider a generic extension of the standard model with two bosonic fields φ and χ that transform differently under SU(2) L. In general, after SU(2) L breaking, the SU(2) L components of these fields φ q , χ q which transform identically under the unbroken SM gauge group SU(3) C × U(1) EM can mix with each other giving rise to a hermitian mass-matrix

Neutrino scattering and B anomalies from hidden sector portals (original) (raw)

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