Semiempirical formula for electroweak response functions in the two-nucleon emission channel in neutrino-nucleus scattering

L., Martinez-Consentino, V.; Amaro, J. E.; Simó, I. Ruiz

doi:10.1103/physrevd.104.113006

Cited by 12 publications

(13 citation statements)

References 69 publications

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“…The effects of two-body currents in nuclei, both in the vector and the axial sectors, are comparable to other nuclear effects. Two-body currents often are inseparable from the one-body current even in the one-particle emission channel and present an additional challenge [58]. Likewise, at much higher energies, pion-production processes for neutrinos can lead to different final states and outgoing hadrons than their electron-induced counterparts and will therefore require more elaborate modeling efforts with less experimental constraints available.…”

Section: Nuclear Effectsmentioning

confidence: 99%

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Electron scattering and neutrino physics

Ankowski,

Ashkenazi,

Bacca

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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A thorough understanding of neutrino–nucleus scattering physics is crucial for the successful execution of the entire US neutrino physics program. Neutrino–nucleus interaction constitutes one of the biggest systematic uncertainties in neutrino experiments—both at intermediate energies affecting long-baseline deep underground neutrino experiment, as well as at low energies affecting coherent scattering neutrino program—and could well be the difference between achieving or missing discovery level precision. To this end, electron–nucleus scattering experiments provide vital information to test, assess and validate different nuclear models and event generators intended to test, assess and validate different nuclear models and event generators intended to be used in neutrino experiments. Similarly, for the low-energy neutrino program revolving around the coherent elastic neutrino–nucleus scattering (CEvNS) physics at stopped pion sources, such as at ORNL, the main source of uncertainty in the evaluation of the CEvNS cross section is driven by the underlying nuclear structure, embedded in the weak form factor, of the target nucleus. To this end, parity-violating electron scattering (PVES) experiments, utilizing polarized electron beams, provide vital model-independent information in determining weak form factors. This information is vital in achieving a percent level precision needed to disentangle new physics signals from the standard model expected CEvNS rate. In this white paper, we highlight connections between electron- and neutrino–nucleus scattering physics at energies ranging from 10 s of MeV to a few GeV, review the status of ongoing and planned electron scattering experiments, identify gaps, and lay out a path forward that benefits the neutrino community. We also highlight the systemic challenges with respect to the divide between the nuclear and high-energy physics communities and funding that presents additional hurdles in mobilizing these connections to the benefit of neutrino programs.

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Section: Nuclear Effectsmentioning

confidence: 99%

“…It is worth mentioning that another promising avenue in experimental extractions of the neutron-skin thickness is measurements of coherent pion photoproduction cross sections [63,64]. Experiments with 58 Ni, Sn 116,120,124…”

Section: Cevns and Pvesmentioning

confidence: 99%

Electron scattering and neutrino physics

Ankowski,

Ashkenazi,

Bacca

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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“…The SuSAM* model was extended in refs. [30,31], by subtracting the theoretical contribution of the meson-exchange currents (MEC) in the 2p2h channel from the experimental data before dividing by the single nucleon, that is…”

Section: Of 19mentioning

confidence: 99%

Improved Superscaling in Quasielastic Electron Scattering with Relativistic Effective Mass

Casale¹,

Amaro²,

L.³

et al. 2023

Preprint

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Superscaling in electron scattering from nuclei is re-examined paying special attention to the definition of the averaged single-nucleon responses. The validity of the extrapolation of nucleon responses in the Fermi gas has been examined, which previously lacked a theoretical foundation. To address this issue, we introduce new averaged responses with a momentum distribution smeared around the Fermi surface, allowing for momenta above the Fermi momentum. This approach solves the problem of negativity in the extrapolation away from the scaling region and, at the same time, validates its use in the scaling analysis. This work has important implications for the interpretation of scaling data and contributes to the development of a more complete understanding of the scaling approach.

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“…The emission of one nucleon is the most important contribution to the inclusive cross section in the quasielastic (QE) region, centered around ω ¼ jQ 2 j=2m Ã N , where ω is the energy transfer, Q 2 ¼ ω 2 − q 2 < 0, and q is the momentum transfer to a nucleon with relativistic effective mass m Ã N [8][9][10][11]. Recent theoretical work have shown the importance of two-particle (2p2h) excitation in the QE cross section (about 20% of the total cross section) [12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…This entanglement makes it not possible to extract the SRC contribution unambiguously from the data alone. In this work we assume that the 2p2h response function induced by OB current can be parametrized with a semiempirical formula similar to that of the MEC responses [23]. By this assumption the 2p2h response will be proportional to the 2p2h phase space and to the singlenucleon response.…”

Section: Introductionmentioning

confidence: 99%

Extended superscaling with two-particle emission in electron and neutrino scattering

Amaro

et al. 2023

Phys. Rev. D

Self Cite

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An extended superscaling analysis of quasielastic electron-scattering data is proposed by parametrizing the scaling function as the sum of a symmetric function corresponding to the emission of a single particle plus a contribution from the phase space of two-particle emission. The phase space of two-particle emission (2p2h) is multiplied by a q-dependent parameter that has been fitted to describe the tail behavior of the scaling function. This approach allows for an alternative description of the quasielastic electron scattering data, incorporating the contributions from both single-particle and two-particle emission processes induced by the one-body current and explaining the asymmetry of the scaling function. In a factorized schematic model based on the independent-pair approximation, the 2p2h parameter is related to the high-momentum distribution of the pair averaged over 2p2h excitations. However, in the phenomenological fitting approach undertaken here, this coefficient includes other contributions such as interference with two-body currents and effects of the final-state interactions. We present predictions for the inclusive two-nucleon emission cross section induced by electrons and neutrinos.

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Semiempirical formula for electroweak response functions in the two-nucleon emission channel in neutrino-nucleus scattering

Cited by 12 publications

References 69 publications

Electron scattering and neutrino physics

Electron scattering and neutrino physics

Improved Superscaling in Quasielastic Electron Scattering with Relativistic Effective Mass

Extended superscaling with two-particle emission in electron and neutrino scattering

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