y scaling in the relativistic region

Relativistic quasifree approximations for inclusive scattering on a bound system are investigated. The system is described by means of the Bethe-Salpeter equation. It is shown that final state interaction (FSI) corrections to the relativistic West approximation (on-shell quasifree kinematics for the struck nucleon) are of the same order of magnitude as the quasifree term in the asymptotic limit q→∞. Therefore the on-shell approximation cannot be applied to data analysis. A consistent relativistic extension is proposed for the West approximation and for the FSI term. The response function given by this approximation depends on a new scaling variable y which differs from that obtained from on-shell kinematics. The analysis of inclusive e2H→e'X experimental data using the new quasifree approximation shows an agreement with the calculated asymptotic limit in the scaling region