Bulg. J. Phys. vol.44 no.S1 (2017), pp. 060-070



Nuclear Dependence of the 2p2h Electroweak Response in the Relativistic Fermi Gas Model

M.B. Barbaro1,2, J.E. Amaro3, J.A. Caballero4, A. De Pace2, T.W. Donnelly5, G.D. Megías4, I. Ruiz Simo3
1Dipartimento di Fisica, Università di Torino, Italy
2Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Italy
3Departamento de Fisica Atomica, Molecular y Nuclear and Instituto de Fisica Teorica y Computacional Carlos I, Universidad de Granada, Spain
4Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Sevilla, Spain
5Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, USA
Abstract. We present the results of a recent study [1] of meson-exchange two-body currents in lepton-nucleus inclusive scattering at various kinematics and for different nuclei within the Relativistic Fermi Gas model. We show that the associated nuclear response functions at their peaks scale as A kF2, for Fermi momentum kF going from 200 to 300 MeV/c and momentum transfer q from 2kF to 2 GeV/c. This behavior is different from what is found for the quasielastic response, which scales as A/kF. This result can be valuable in the analyses of long-baseline neutrino oscillation experiments, which need to implement these nuclear effects in Monte Carlo simulations for different kinematics and nuclear targets.

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