Producing a new fermion in coherent elastic neutrino-nucleus scattering: from neutrino mass to dark matter

Brdar, Vedran; Rodejohann, Werner; Xu, Xun-Jie

doi:10.1007/jhep12(2018)024

Cited by 64 publications

(65 citation statements)

References 77 publications

(112 reference statements)

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“…One can conclude that the COHERENT experiment (with 133 Cs) has seen a very substantial part of Coherent Elastic Neutrino Nucleus Scattering (CEνNS), but with 15-20% uncertainty, due to the high neutrino energy and the high energy threshold (5 keV excitation γs escape detection. An accurate analysis of the COHERENT-like data (see for example [73][74][75][76][77][78][79][80][81][82][83]) should take the incoherent contribution into account. There are two ways for an accurate study of the CEνNS.…”

Section: Arxiv:190403119v1 [Hep-ph] 5 Apr 2019mentioning

confidence: 99%

On Coherent Neutrino and Antineutrino Scattering off Nuclei

Bednyakov

Naumov

2019

Phys. Part. Nuclei Lett.

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Neutrino-nucleus νA → νA and antineutrino-nucleusνA →νA interactions, when the nucleus conserves its integrity, are discussed with coherent (elastic) and incoherent (inelastic) scattering regimes taken into account. In the first regime the nucleus remains in the same quantum state after the scattering and the cross-section depends on the quadratic number of nucleons. In the second regime the nucleus changes its quantum state and the cross-section has an essentially linear dependence on the number of nucleons. The coherent and incoherent cross-sections are driven by a nuclear nucleon form-factor squared |F | 2 term and a (1−|F | 2 ) term, respectively. One has a smooth transition between the regimes of coherent and incoherent (anti)neutrino-nucleus scattering. Due to the neutral current nature these elastic and inelastic processes are indistinguishable if the nucleus recoil energy is only observed. One way to separate the coherent signal from the incoherent one is to register γ quanta from deexcitation of the nucleus excited during the incoherent scattering. Another way is to use a very low-energy threshold detector and collect data at very low recoil energies, where the incoherent scattering is vanishingly small. In particular, for 133 Cs and neutrino energies of 30-50 MeV the incoherent cross-section is about 15-20% of the coherent one. Therefore, the COHERENT experiment (with 133 Cs) has measured the coherent elastic neutrino nucleus scattering (CEνNS) with the inelastic admixture at a level of 15-20%, if the excitation γ quantum escapes its detection.After Freedman's paper [1] it was confirmed [2-5] that in the Standard Model the cross-section of elastic neutrino scattering off a nucleus is enhanced with respect to neutrino scattering off a single nucleon. The amplification factor for a spinless even-evenHere T A is the kinetic energy of the scattered nucleus, m A is the nucleus mass, q is the momentum transfer, G F is the Fermi constant, Z and N are the numbers of protons and neutrons, g p/n V are the proton/neutron couplings of the nucleon vector current, and F p/n (q) are the proton/neutron form-factors of the nucleus. The form-factors vanish as |q| → ∞ and approach unity (F p/n (q) = 1) if |q|R A 1, where R A is the radius of the nucleus. The coherency requirement reads as |q|R 1. Freedman used the termin "coherent neutrino-nucleus scattering" (CNNS) [1] to emphasize the fact that the dependence of the corresponding cross-section is quadratic in terms of the number of nucleons.The importance of the CNNS was demonstrated for a number of observables in astrophysics, like stellar collapse [13,14], and Supernovae [12,[15][16][17], in studies of physics beyond the Standard Model (SM) [3,11,[18][19][20][21][22][23][24][25][26][27][28], and in investigation of the nuclear structure [4,[29][30][31][32][33]. Due to the neutral-current nature an observation of ν-oscillations with CNNS could be evidence for sterile neutrino(s) [34,35]. Coherent scattering off atomic systems was studied in [36,37]. There are some expe...

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Section: Arxiv:190403119v1 [Hep-ph] 5 Apr 2019mentioning

confidence: 99%

On Coherent Neutrino and Antineutrino Scattering off Nuclei

Bednyakov

Naumov

2019

Phys. Part. Nuclei Lett.

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“…The density profile of the Sun can be described more accurately than in (30) by an exponential distribution with a cut-off at the solar radius:…”

Section: Exponential Density Distribution With a Cut-offmentioning

confidence: 99%

Wolfenstein potentials for neutrinos induced by ultra-light mediators

Smirnov

2019

J. High Energ. Phys.

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New physics can emerge at low energy scales, involving very light and very weakly interacting new particles. These particles can mediate interactions between neutrinos and usual matter and contribute to the Wolfenstein potential relevant for neutrino oscillations. We compute the Wolfenstein potential in the presence of ultra-light scalar and vector mediators and study the dependence of the potential on the mediator mass m A , taking the finite size of matter distribution (Earth, Sun, supernovae) into consideration. For ultra-light mediators with m −1 A comparable to the size of the medium (R), the usual m −2 A dependence of the potential is modified. In particular, when m −1 A R, the potential does not depend on m A . Taking into account existing bounds on light mediators, we find that for the scalar case significant effects on neutrino propagation are not possible, while for the vector case large matter effects are allowed for m A ∈ [2 × 10 −17 , 4 × 10 −14 ] eV and the gauge coupling g ∼ 10 −25 . arXiv:1909.07505v2 [hep-ph]

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“…This can be seen from the cross section [275]: Figure 17.2: A process to produce dark matter in CEVNS proposed in Ref. [276].…”

Section: • Light Mediatormentioning

confidence: 96%

“…The COHERENT data provides an important new channel to search for beyond the Standard Model (BSM) physics. For example, the data constrains non-standard neutrino interactions (NSI) [12,271] due to heavy or light mediators [18][19][20][272][273][274][275][276], generalized scalar and vector neutrino interactions [277], and hidden sector models [278]. It also sets independent constraints on the effective neutron size distribution of CsI [279][280][281], and on sterile neutrinos [282,283].…”

Section: Utilizing Neutrinos To Probe Light Mediatorsmentioning

confidence: 99%

Neutrino non-standard interactions: A status report

Dev

Babu

Denton

et al. 2019

SciPost Phys. Proc.

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137

117

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This report summarizes the present status of neutrino non-standard interactions (NSI). After a brief overview, several aspects of NSIs are discussed, including connection to neutrino mass models, model-building and phenomenology of large NSI with both light and heavy mediators, NSI phenomenology in both short- and long-baseline neutrino oscillation experiments, neutrino cross-sections, complementarity of NSI with other low- and high-energy experiments, fits with neutrino oscillation and scattering data, DUNE sensitivity to NSI, effective field theory of NSI, as well as the relevance of NSI to dark matter and cosmology. We also discuss the open questions and interesting future directions that can be pursued by the community at large. This report is based on talks and discussions during the Neutrino Theory Network NSI workshop held at Washington University in St.~Louis from May 29-31, 2019

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Producing a new fermion in coherent elastic neutrino-nucleus scattering: from neutrino mass to dark matter

Cited by 64 publications

References 77 publications

On Coherent Neutrino and Antineutrino Scattering off Nuclei

On Coherent Neutrino and Antineutrino Scattering off Nuclei

Wolfenstein potentials for neutrinos induced by ultra-light mediators

Neutrino non-standard interactions: A status report

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