Lepton flavor violating non-standard interactions via light mediators

Farzan, Yasaman; Shoemaker, Ian M.

doi:10.1007/jhep07(2016)033

Cited by 118 publications

(102 citation statements)

References 70 publications

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“…Notice, however, that such an energy dependence is different if the NSI are due to light mediators (see, for instance, refs. [27,28]). In this case the effects depend on the high-energy, gauge-invariant, completion of each scenario.…”

Section: Jhep01(2017)141mentioning

confidence: 99%

Non-standard interactions with high-energy atmospheric neutrinos at IceCube

Salvadó

Mena

Palomares‐Ruiz

et al. 2017

J. High Energ. Phys.

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Non-standard interactions in the propagation of neutrinos in matter can lead to significant deviations from expectations within the standard neutrino oscillation framework and atmospheric neutrino detectors have been considered to set constraints. However, most previous works have focused on relatively low-energy atmospheric neutrino data. Here, we consider the one-year high-energy through-going muon data in IceCube, which has been already used to search for light sterile neutrinos, to constrain new interactions in the µτ -sector. In our analysis we include several systematic uncertainties on both, the atmospheric neutrino flux and on the detector properties, which are accounted for via nuisance parameters. After considering different primary cosmic-ray spectra and hadronic interaction models, we improve over previous analysis by using the latest data and showing that systematics currently affect very little the bound on the off-diagonal ε µτ , with the 90% credible interval given by −6.0 × 10 −3 < ε µτ < 5.4 × 10 −3 , comparable to previous results. In addition, we also estimate the expected sensitivity after 10 years of collected data in IceCube and study the precision at which non-standard parameters could be determined for the case of ε µτ near its current bound.

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Section: Jhep01(2017)141mentioning

confidence: 99%

Non-standard interactions with high-energy atmospheric neutrinos at IceCube

Salvadó

Mena

Palomares‐Ruiz

et al. 2017

J. High Energ. Phys.

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“…In gauge invariant models of new physics at high energies, NSI parameters are expected to be subject to tight constraints from charged lepton observables [14,15], leading to no visible effect in oscillations. However, more recently it has been argued that viable gauge models with light mediators (i.e., below the electro-weak scale) may lead to observable effects in oscillations without entering in conflict with other bounds [16][17][18] (see also Ref.[19] for a discussion). In particular, for light mediators, bounds from high-energy neutrino scattering experiments such as CHARM [20] and NuTeV [21] do not apply.…”

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confidence: 99%

COHERENT enlightenment of the neutrino dark side

et al. 2017

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In the presence of non-standard neutrino interactions (NSI), oscillation data are affected by a degeneracy which allows the solar mixing angle to be in the second octant (aka the dark side) and implies a sign flip of the atmospheric mass-squared difference. This leads to an ambiguity in the determination of the ordering of neutrino masses, one of the main goals of the current and future experimental neutrino program. We show that the recent observation of coherent neutrino-nucleus scattering by the COHERENT experiment, in combination with global oscillation data, excludes the NSI degeneracy at the 3.1σ (3.6σ) CL for NSI with up (down) quarks.The standard three-flavour oscillation scenario is supported by a large amount of data from neutrino oscillation experiments. The determination of oscillation parameters (see, e.g., Ref.[1]) is very robust, and for a broad range of new physics scenarios only small perturbations of the standard oscillation picture are allowed by data. There is, however, an exception to this statement: in the presence of non-standard neutrino interactions (NSI) [2-4] a degeneracy exists in oscillation data, leading to a qualitative change of the lepton mixing pattern. This was first observed in the context of solar neutrinos, where for suitable NSI the data can be explained by a mixing angle θ 12 in the second octant, the so-called LMA-Dark (LMA-D) [5] solution. This is in sharp contrast to the established standard MSW solution [2,6], which requires a mixing angle θ 12 in the first octant.The origin of the LMA-D solution is a degeneracy in oscillation probabilities due to a symmetry of the Hamiltonian describing neutrino evolution in the presence of NSI [7][8][9][10]. This degeneracy involves not only the octant of θ 12 but also a change in sign of the larger neutrino mass-squared difference, ∆m 2 31 , which is used to parameterize the type of neutrino mass ordering (normal versus inverted). Hence, the LMA-D degeneracy makes it impossible to determine the neutrino mass ordering by oscillation experiments [10], and therefore jeopardizes one of the main goals of the upcoming neutrino oscillation program. As discussed in Refs. [5,[10][11][12], non-oscillation data (such as that from neutrino scattering experiments) is needed to break this degeneracy.Recently, coherent neutrino-nucleus scattering has been observed for the first time by the COHERENT experiment [13], using neutrinos produced at the Spallation Neutron Source (SNS) in Oak Ridge National Laboratory. The observed interaction rate is in good agreement with the Standard Model (SM) prediction and can be used to constrain NSI. In this Letter we show that this result excludes the LMA-D solution at 3.1σ (3.6σ) CL for NSI with up (down) quarks when combined with oscillation data.NSI formalism and the LMA-D degeneracy. We consider the presence of neutral-current (NC) NSI in the form of dimension-six four-fermion operators, following the notation of Ref. [8]. Since we are interested in the contribution of the NSI to the effective potential of ne...

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“…[11,12]). Gauging the symmetry based on L µ − L τ [13] has attracted quite a bit of interest in recent years [14][15][16][17][18][19][20][21][22]. While such new interactions would be also…”

Section: Jhep12(2017)096mentioning

confidence: 99%

“…The amplitude is given by 22) where the form factor F + (0) = 0.96 [59]. This leads to the partial width…”

Section: Jhep12(2017)096mentioning

confidence: 99%

Flavor gauge models below the Fermi scale

Babu

Friedland

Machado

et al. 2017

J. High Energ. Phys.

120

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The mass and weak interaction eigenstates for the quarks of the third generation are very well aligned, an empirical fact for which the Standard Model offers no explanation. We explore the possibility that this alignment is due to an additional gauge symmetry in the third generation. Specifically, we construct and analyze an explicit, renormalizable model with a gauge boson, X, corresponding to the B − L symmetry of the third family. Having a relatively light (in the MeV to multi-GeV range), flavor-nonuniversal gauge boson results in a variety of constraints from different sources. By systematically analyzing 20 different constraints, we identify the most sensitive probes: kaon, B + , D + and Upsilon decays, D −D 0 mixing, atomic parity violation, and neutrino scattering and oscillations. For the new gauge coupling g X in the range (10 −2 -10 −4 ) the model is shown to be consistent with the data. Possible ways of testing the model in b physics, top and Z decays, direct collider production and neutrino oscillation experiments, where one can observe nonstandard matter effects, are outlined. The choice of leptons to carry the new force is ambiguous, resulting in additional phenomenological implications, such as nonuniversality in semileptonic bottom decays. The proposed framework provides interesting connections between neutrino oscillations, flavor and collider physics.

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Lepton flavor violating non-standard interactions via light mediators

Cited by 118 publications

References 70 publications

Non-standard interactions with high-energy atmospheric neutrinos at IceCube

Non-standard interactions with high-energy atmospheric neutrinos at IceCube

COHERENT enlightenment of the neutrino dark side

Flavor gauge models below the Fermi scale

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