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$^{16}$O spectral function from coupled-cluster theory: applications to lepton-nucleus scattering

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arxiv 2309.00355 v1 pith:Z5VP4DP5 submitted 2023-09-01 nucl-th hep-ph

classification nucl-thhep-ph
keywords spectralfunctionlepton-nucleusscatteringcoupled-clustercrossdataelectron
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abstract

We calculate the $^{16}$O spectral function by combining coupled-cluster theory with a Gaussian integral transform and by expanding the integral kernel in terms of Chebyshev polynomials to allow for a quantification of the theoretical uncertainties. We perform an analysis of the spectral function and employ it to predict lepton-nucleus scattering. Our results well describe the $^{16}$O electron scattering data in the quasi-elastic peak for momentum transfers $|\mathbf{q}|\gtrapprox500$ MeV and electron energies up to 1.2 GeV, extending therefore the so-called first principles approach to lepton-nucleus cross sections well into the relativistic regime. To prove the applicability of this method to neutrino-nucleus cross sections, we implement our $^{16}$O spectral functions in the NuWro Monte Carlo event generator and provide a comparison with recently published T2K neutrino data.

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  1. Inference of response functions with the help of machine learning algorithms

    quant-ph 2025-01 conditional novelty 4.0 of 10

    A neural network trained on skewed-Gaussian response functions produces Chebyshev kernel coefficients that reconstruct response functions more accurately than the Gaussian integral transform when only a small number o...

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