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$^{16}$O spectral function from coupled-cluster theory: applications to lepton-nucleus scattering | | Joanna E. Sobczyk
; Sonia Bacca
; | | Date: |
1 Sep 2023 | | 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. | | Source: | arXiv, 2309.00355 | | Services: | Forum | Review | PDF | Favorites | |
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