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The frozen nucleon approximation in two-particle two-hole response functions

Opened Access The frozen nucleon approximation in two-particle two-hole response functions

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Autor: Ruiz Simo, I.
Amaro, J. E.
Barbaro, M. B.
Caballero Carretero, Juan Antonio
Megías Vázquez, Guillermo Daniel
Donnelly, T. W.
Departamento: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Fecha: 2017-07-10
Publicado en: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 770, 1-8.
Tipo de documento: Artículo
Resumen: We present a fast and efficient method to compute the inclusive two-particle two-hole (2p–2h) electroweak responses in the neutrino and electron quasielastic inclusive cross sections. The method is based on two approximations. The first neglects the motion of the two initial nucleons below the Fermi momentum, which are considered to be at rest. This approximation, which is reasonable for high values of the momentum transfer, turns out also to be quite good for moderate values of the momentum transfer q≳kF. The second approximation involves using in the “frozen” meson-exchange currents (MEC) an effective Δ-propagator averaged over the Fermi sea. Within the resulting “frozen nucleon approximation”, the inclusive 2p–2h responses are accurately calculated with only a one-dimensional integral over the emission angle of one of the final nucleons, thus drastically simplifying the calculation and reducing the computational time. The latter makes this method especially well-suited for implemen...
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Cita: Ruiz Simo, I., Amaro, J.E., Barbaro, M.B., Caballero Carretero, J.A., Megías Vázquez, G.D. y Donnelly, T.W. (2017). The frozen nucleon approximation in two-particle two-hole response functions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 770, 1-8.
Tamaño: 197.4Kb
Formato: PDF

URI: http://hdl.handle.net/11441/64233

DOI: 10.1016/j.physletb.2017.04.063

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