Abstract
We calculate the 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 electron-scattering data in the quasielastic peak for momentum transfers 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 spectral functions in the nuwro Monte Carlo event generator and provide a comparison with recently published T2K neutrino data.
2 More- Received 19 September 2023
- Accepted 7 March 2024
DOI:https://doi.org/10.1103/PhysRevC.109.044314
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