Inclusion of the longitudinal component of the transferred momentum Qz and the transverse relative momentum p⊥ in the diffraction approach to the H(d, p)X reactions

In this work, within the framework of the Glauber - Sitenko approximation, we present an analysis of the differential cross section for deuteron breakup with proton emission in the reaction H(d, p)X at small proton emission angles (θp < 7 μrad). The study employs several parameterizations of the deuteron wave function, including the single-Gaussian, the multi-Gaussian K2 parameterization, and models based on the Av18 and Nijm I nucleon-nucleon potentials. Particular attention is paid to the effects of small longitudinal components of the transferred momentum (|Qz| ≤ 0.5 GeV/c in the laboratory frame) and the transverse momentum of the proton-neutron pair (p⊥ = (px, 0) ≤ 0.5 GeV/c) in the antilaboratory reference frame. The results are compared with available experimental data, especially in the region of longitudinal momenta kz = p3* = 0.25 – 0.5 GeV/c (in the antilaboratory frame), where quark effects are expected to become significant. Calculations show an increase in the differential cross section with increasing transverse momentum, as well as a small shift – and a noticeable enhancement – of the cross section maximum when the longitudinal component Qz is included.