We study the phase-space dependence of 2p-2h excitations in neutrino scattering using the relativistic Fermi gas model. We follow a similar approach to other authors, but focusing in the phase-space properties, comparing with the non-relativistic model. A careful mathematical analysis of the angular distribution function for the outgoing nucleons is performed. Our goals are to optimize the CPU time of the 7D integral to compute the hadron tensor in neutrino scattering, and to conciliate the different relativistic and non relativistic models by describing general properties independently of the two-body current. For some emission angles the angular distribution becomes infinite in the Lab system, and we derive a method to integrate analytically around the divergence. Our results show that the frozen approximation, obtained by neglecting the momenta of the two initial nucleons inside the integral of the hadron tensor, reproduces fairly the exact response functions for constant current matrix elements.

2p-2h excitations in neutrino scattering: angular distribution and frozen approximation

BARBARO, Maria Benedetta;
2015

Abstract

We study the phase-space dependence of 2p-2h excitations in neutrino scattering using the relativistic Fermi gas model. We follow a similar approach to other authors, but focusing in the phase-space properties, comparing with the non-relativistic model. A careful mathematical analysis of the angular distribution function for the outgoing nucleons is performed. Our goals are to optimize the CPU time of the 7D integral to compute the hadron tensor in neutrino scattering, and to conciliate the different relativistic and non relativistic models by describing general properties independently of the two-body current. For some emission angles the angular distribution becomes infinite in the Lab system, and we derive a method to integrate analytically around the divergence. Our results show that the frozen approximation, obtained by neglecting the momenta of the two initial nucleons inside the integral of the hadron tensor, reproduces fairly the exact response functions for constant current matrix elements.
NUFACT 2014
Glasgow, Scotland, UK
25–30 August 2014
Proceedings, 16th International Workshop on Neutrino Factories and Future Neutrino Beam Facilities (NUFACT 2014)
Proceeding of Science - SISSA
1
10
http://arxiv.org/abs/1501.07120v1
Nuclear Theory; Nuclear Theory
Ruiz Simo, I.; Albertus, C.; Amaro, J. E.; Barbaro, M. B.; Caballero, J. A.; Donnelly, T. W.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1642173
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