Constraints on light singlet fermion interactions from coherent elastic neutrino-nucleus scattering

Chang, We-Fu; Liao, Jiajun

doi:10.48550/arxiv.2002.10275

Cited by 4 publications

(13 citation statements)

References 36 publications

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“…where the factor of 1/2 accounts for the missing projection operator in the cross section calculation in Ref. [13]. The scalar, tensor and dipole operators have no interference with the SM neutral current and the above bounds apply to both LNC and LNV cases.…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 96%

“…[13]) irrespective of the mixing between LH and RH neutrinos. The interference terms are suppressed by T /E ν [13] and are thus not included here.…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 98%

“…The expected number of CEνNS events depends on the neutrino flux and the CEνNS differential cross section dσ/dT with T being the recoil energy of the nucleus. The differential cross section for (−) ν N → XN coherent scattering, where X ∈ {ν, ν, N, N } denotes a neutrino, is at leading order given by [13,22]…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 99%

“…where F (Q 2 ) is the Helm form factor with Q being the transferred energy. The 90% CL bound on the dipole operators is given by [13] A…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 99%

“…Recently, Refs. [9][10][11][12][13][14] considered the bound from the CEνNS on the LNC operators in LNEFT and SMNEFT. With the complete basis of LNEFT and SMNEFT, however, we can perform a comprehensive study of the constraints on both the LNC and LNV cases and investigate the implication for NP above the electroweak scale.…”

Section: Introductionmentioning

confidence: 99%

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General neutrino interactions with sterile neutrinos in light of coherent neutrino-nucleus scattering and meson invisible decays

Li,

Ma,

Schmidt

2020

Preprint

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In this work we study the current bounds from the CEνNS process and meson invisible decays on generic neutrino interactions with sterile neutrinos in effective field theories. The interactions between quarks and left-handed SM neutrinos and/or right-handed neutrinos are first described by the low-energy effective field theory (LNEFT) between the electroweak scale and the chiral symmetry breaking scale. We complete the independent operator basis for the LNEFT up to dimension-6 by including both the lepton-numberconserving (LNC) and lepton-number-violating (LNV) operators involving right-handed neutrinos. We translate the bounds on the LNEFT Wilson coefficients from the COHERENT observation and calculate the branching fractions of light meson invisible decays. The bounds on LNEFT are then mapped onto the SM effective field theory with sterile neutrinos (SMNEFT) to constrain new physics above the electroweak scale. We find that the meson invisible decays can provide the only sensitive probe for τ neutrino flavor component and s quark component in the quark-neutrino interactions involving two (one) active neutrinos and for the effective operators without any active neutrino fields. The CEνNS process places the most stringent bound on all other Wilson coefficients. By assuming one dominant Wilson coefficient at a time in SMNEFT and negligible sterile neutrino mass, the most stringent limits on the new physics scale are 2.7 − 10 TeV from corresponding dipole operator in LNEFT and 0.5 − 1.5 TeV from neutrino-quark operator in LNEFT.

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Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 96%

“…[13]) irrespective of the mixing between LH and RH neutrinos. The interference terms are suppressed by T /E ν [13] and are thus not included here.…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 98%

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 99%

“…where F (Q 2 ) is the Helm form factor with Q being the transferred energy. The 90% CL bound on the dipole operators is given by [13] A…”

Section: Neutrino-nucleus Coherent Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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General neutrino interactions with sterile neutrinos in light of coherent neutrino-nucleus scattering and meson invisible decays

Li,

Ma,

Schmidt

2020

Preprint

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Absorption of fermionic dark matter by nuclear targets

Dror

Elor

McGehee

2020

J. High Energ. Phys.

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Absorption of fermionic dark matter leads to a range of distinct and novel signatures at dark matter direct detection and neutrino experiments. We study the possible signals from fermionic absorption by nuclear targets, which we divide into two classes of four Fermi operators: neutral and charged current. In the neutral current signal, dark matter is absorbed by a target nucleus and a neutrino is emitted. This results in a characteristically different nuclear recoil energy spectrum from that of elastic scattering. The charged current channel leads to induced β decays in isotopes which are stable in vacuum as well as shifts of the kinematic endpoint of β spectra in unstable isotopes. To confirm the possibility of observing these signals in light of other constraints, we introduce UV completions of example higher dimensional operators that lead to fermionic absorption signals and study their phenomenology. Most prominently, dark matter which exhibits fermionic absorption signals is necessarily unstable leading to stringent bounds from indirect detection searches. Nevertheless, we find a large viable parameter space in which dark matter is sufficiently long lived and detectable in current and future experiments.

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