Concept of Coherence in Neutrino and Antineutrino Scattering off Nuclei

Bednyakov, V. A.; Naumov, D.

doi:10.1134/s1063779620060039

Cited by 7 publications

(23 citation statements)

References 191 publications

(856 reference statements)

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“…Since in the lab frame the target nucleus is at rest in some |n -state, the differential cross section of the process χA n → χA ( * ) m (see, for example, [1][2][3][4][10][11][12]) takes the form…”

Section: Kinematics and Cross Section Of χA Scatteringmentioning

confidence: 99%

“…The probability amplitude of relativistic χ lepton scattering on a nucleus, as in the nonrelativistic case [4], is based on the assumption that the interaction is between the lepton and the structureless nucleon. This allows one to use the effective 4-fermion Lagrangian [1,3] written as the product of the lepton L µ (x) = h χ ψ χ (x)O µ ψ χ (x) and nucleon H µ (x) = f =n,p h f ψ f (x)O µ ψ f (x) currents, where the O µ are combinations of γ-matrices.…”

Section: Kinematics and Cross Section Of χA Scatteringmentioning

confidence: 99%

“…In [1][2][3], an approach was formulated to describe the interaction of massless neutrinos and antineutrinos with a nucleus resulting in that the nucleus either remains in its original state or goes into an excited state while maintaining the integrity ν(ν) + A → ν(ν) + A ( * ) . In [4], this approach was generalized to the case of nonrelativistic scattering of a massive neutral weakly interacting lepton on nuclei.…”

Section: Introductionmentioning

confidence: 99%

“…Recall that the approach [1][2][3] is based on the description of the nucleus as a bound state of its structureless nucleons, whose interaction with the lepton is given by the effective 4-fermionic Lagrangian and is described by means of the scalar products of the lepton and nucleon currents, which allows one to control the spin states of nucleons in the initial and final states of the nucleus. Due to the constructive use of the completeness of the wave functions of nuclear states (conservation of probability), it is possible to represent the observable cross section as a sum of two terms.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, the goal of this paper is to further generalize both the massless neutrino [1][2][3] and the massive lepton [4,5] approaches to the relativistic case of interaction of massive neutral weakly interacting particles (χ leptons) with nuclei χA → χA ( * ) , and elucidate new regularities that arise within the generaliztion.…”

Section: Introductionmentioning

confidence: 99%

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On massive neutral lepton scattering on nucleus

Bednyakov¹

2023

Preprint

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The paper presents a theoretical approach to the description of the relativistic scattering of a massive (neutral) lepton on a nucleus, in which the latter retains its integrity. The measurable cross section of this process includes the elastic (or coherent) contribution, when the nucleus remains in its original quantum state and the inelastic (incoherent) contribution, when the nucleus goes into another (excited) quantum state. Transition from the elastic scattering regime to the inelastic scattering regime is regulated automatically by the dependence of the nucleon-nucleus form factors on the momentum transferred to the nucleus. At small momentum transfers elastic scattering dominates. AS the transferred momentum increases, the contribution of the inelastic scattering increases, and the latter becomes dominant at sufficiently large transferred momenta. The interaction of a pointlike lepton with structureless nucleons of the target nucleus is parameterized with four effective coupling constants, reflecting the (axial)vector nature of the weak interaction.The scattering of massive (anti)neutrinos interacting with nucleons through the V ∓ A currents of the Standard Model is considered in detail. Because of the nonzero masses, an additional channel arises for elastic and inelastic scattering of these (anti)neutrinos on nuclei due to the possibility of changing the helicity of these (anti)neutrinos. For example, despite the smallness of the masses at (kinetic) energies of (anti)neutrinos much lower than the neutrino masses (for example, relic ones), the cross section of their interaction with the nucleus turns out to be many times enhanced, at least due to the "nucleus coherence effect".The expressions obtained for the cross sections are applicable to any precision data analysis involving neutrinos and antineutrinos, especially when non-zero neutrino masses can be taken into account. These expressions can also be used in the analysis of experiments on direct detection of (neutral) massive weakly interacting relativistic dark matter particles since, unlike the generally accepted case, they simultaneously take into account both elastic and inelastic interactions of the particles. The presence of an "inelastic signal" with its characteristic signature may be the only registrable evidence of interaction of the dark matter particle with the nucleus.

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Section: Kinematics and Cross Section Of χA Scatteringmentioning

confidence: 99%

Section: Kinematics and Cross Section Of χA Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On massive neutral lepton scattering on nucleus

Bednyakov¹

2023

Preprint

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Bragg-Primakoff axion photoconversion in crystal detectors

Dent,

Dutta,

Thompson

2024

J. High Energ. Phys.

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Axions and axion-like pseudoscalar particles with dimension-5 couplings to photons exhibit coherent Primakoff scattering with ordered crystals at keV energy scales, making for a natural detection technique in searches for solar axions. We find that there are large suppressive corrections, potentially greater than a factor of $$ \mathcal{O} $$ O (103), to the coherent enhancement when taking into account absorption of the final state photon. This effect has already been accounted for in light-shining-through-wall experiments through the language of Darwin classical diffraction, but is missing from the literature in the context of solar axion searches that use a matrix element approach. We extend the treatment of the event rate with a heuristic description of absorption effects to bridge the gap between these two languages. Furthermore, we explore the Borrmann effect of anomalous absorption in lifting some of the event rate suppression by increasing the coherence length of the conversion. We study this phenomenon in Ge, NaI, and CsI crystal experiments and its impact on the projected sensitivities of SuperCDMS, LEGEND, and SABRE to the solar axion parameter space. Lastly, we comment on the reach of multi-tonne scale crystal detectors and strategies to maximize the discovery potential of experimental efforts in this vein.

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Accessing new physics with an undoped, cryogenic CsI CEvNS detector for COHERENT at the SNS

Barbeau,

Belov,

Bernardi

et al. 2024

Phys. Rev. D

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We consider the potential for a 10 kg undoped cryogenic CsI detector operating at the Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity to discover new physics beyond the standard model (BSM). Through a combination of increased event rate, lower threshold, and good timing resolution, such a detector would significantly improve on past measurements. We considered tests of several BSM scenarios such as neutrino nonstandard interactions and accelerator-produced dark matter. This detector’s performance was also studied for relevant questions in nuclear physics and neutrino astronomy, namely the weak charge distribution of Cs and I nuclei and detection of neutrinos from a core-collapse supernova. Published by the American Physical Society 2024

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Concept of Coherence in Neutrino and Antineutrino Scattering off Nuclei

Cited by 7 publications

References 191 publications

On massive neutral lepton scattering on nucleus

On massive neutral lepton scattering on nucleus

Bragg-Primakoff axion photoconversion in crystal detectors

Accessing new physics with an undoped, cryogenic CsI CEvNS detector for COHERENT at the SNS

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