Two-nucleon emission in neutrino and electron scattering from nuclei: The modified convolution approximation

Ruiz Simo, I.; Amaro, J. E.; Barbaro, M. B.; Caballero, J. A.; Megias, G. D.; Donnelly, T. W.

doi:10.1016/j.aop.2017.11.029

Title: Two-nucleon emission in neutrino and electron scattering from nuclei: The modified convolution approximation

Journal Article · Sat Dec 02 00:00:00 EST 2017 · Annals of Physics

DOI:https://doi.org/10.1016/j.aop.2017.11.029· OSTI ID:1511587

Ruiz Simo, I. ^[1]; Amaro, J. E. ^[1]; Barbaro, M. B. ^[2]; Caballero, J. A. ^[3]; Megias, G. D. ^[3]; Donnelly, T. W. ^[4]

Universidad de Granada (Spain)
Università di Torino and INFN, Torino (Italy)
Universidad de Sevill (Spain)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

In this paper, the theoretical formalism of inclusive lepton-nucleus scattering in the two-nucleon emission channel is discussed in the context of a simplified approach, the modified convolution approximation. This allows one to write the 2p2h responses of the relativistic Fermi gas as a folding integral of two 1p1h responses with the energies and momenta transferred to each nucleon. The idea behind this method is to introduce different average momenta for the two initial nucleons in the matrix elements of the two-body current, with the innovation that they depend on the transferred energies and momenta. This method treats exactly the two-body phase space kinematics, and reduces the formulae of the response functions from seven-dimensional integrals over momenta to much simpler three-dimensional ones. The applicability of the method is checked by comparing with the full results within a model of electroweak meson-exchange currents. Finally, the predictions are accurate enough, especially in the low-energy threshold region where the average momentum approximation works the best.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-94ER40818; IJCI-2014-20038; FQM7632

OSTI ID:: 1511587

Alternate ID(s):: OSTI ID: 1576036

Journal Information:: Annals of Physics, Vol. 388, Issue C; ISSN 0003-4916

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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