Polarization in inclusive reactions

We estimate the contribution of Regge-cut graphs to the single-polarization measurements such as the polarization of the outgoing particle $P_c$, the polarized-beam asymmetry ${\Sigma }_a$, and the polarized-target asymmetry ${\Sigma }_b$ for inclusive reactions in the triple-Regge region. We find that in the energy region where these cut graphs may be important relative to other contributions, all the single-polarization observables are small, roughly ≤5%. Comparisons are made with the available data on these spin observables. We also discuss the implications of those results for triple-Regge phenomenology.