Inelastic diffraction data and the effective Pomeron trajectory

摘要

A further analysis of inelastic diffraction data at the ISR and SPS-Collider confirms the relatively flat s-independent Pomeron trajectory in the high- domain, 1 < < 2 GeV2, reported earlier by the UA8 Collaboration. At = 1.5 GeV2 alpha = 0.92 +/- 0.03 is in agreement with the trajectories found in diffractive photoproduction of vector mesons at HERA. This suggests a universal fixed Pomeron trajectory at high-. We also show that a triple-Regge Pomeron-exchange parametrization fit to the data requires an s-dependent (effective) Pomeron trajectory intercept, alpha(0), which decreases with increasing s, as expected from unitarization (multi-Pomeron-exchange) calculations. alpha(0) = 1.10 at the lowest ISR energy, 1.03 at the SPS-Collider and perhaps smaller at the Tevatron. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 57]