Towards a more complete description of nucleon distortion in lepton-induced single-pion production at low-\(Q^2\)

Abstract

Theoretical predictions for lepton-induced single-pion production (SPP) on \(^{12}\)C are revisited in order to assess the effect of different treatments of the current operator. On one hand we have the asymptotic approximation, which consists in replacing the particle four-vectors that enter in the operator by their asymptotic values, i.e., their values out of the nucleus. On the other hand we have the full calculation, which is a more accurate approach to the problem. We also compare with results in which the final nucleon is described by a relativistic plane wave, to rate the effect of the nucleon distortion. The study is performed for several lepton kinematics, reproducing inclusive and semi-inclusive cross sections belonging to the low-\(Q^2\) region (between 0.05 and 1 GeV\(^2\)), which is of special interest in charged-current (CC) neutrino-nucleus 1\(\pi\) production. Inclusive electron results are compared with experimental data. We find non-trivial corrections comparable in size with the effect of the nucleon distortion, namely, corrections up to 6\%, either increasing or diminishing the asymptotic prediction, and a shift of the distributions towards higher energy transfer. For the semi-inclusive cross sections, we observe the correction to be prominent mainly at low values of the outgoing nucleon kinetic energy. Finally, for CC neutrino-induced 1\(\pi^+\) production, we find a reduction at low-\(Q^2\) with respect to both the plane-wave approach and the asymptotic case.