Elastic Vector Meson Production at HERA
B. Mellado

TL;DR
This paper presents new measurements of elastic vector meson production at HERA, revealing insights into the underlying physics, including the independence from photon polarization and the non-universality of the Pomeron trajectory.
Contribution
It provides the first detailed analysis of elastic VM cross-sections and trajectory behavior, highlighting differences from universal models and soft physics indications.
Findings
Elastic VM production is independent of photon polarization.
Non-zero shrinkage observed in J/psi photoproduction suggests soft physics.
Data do not support a universal Pomeron trajectory.
Abstract
The H1 and ZEUS Collaborations report new results on elastic VM cross-section and trajectory determination. Elastic VM production appears to be independent of the photon polarization. The presence of non-zero shrinkage in the photoproduction of J/psi indicates the presence of soft physics. Accumulated data do not accommodate a universal Pomeron trajectory. The steepness of the x dependence of elastic VM production with changing Q^2+M_V^2 is similar to that of F_2 with changing Q^2.
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Taxonomy
TopicsHigh-Energy Particle Collisions Research · Particle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions
