Rho-0 Meson Helicity Amplitude Ratios at HERMES
Morgan Murray
TL;DR
This paper investigates rho-0 meson helicity amplitude ratios at HERMES, confirming some pQCD predictions, highlighting significant unnatural parity exchange contributions, and examining their kinematic dependencies with mixed agreement to theory.
Contribution
It provides the first detailed analysis of rho-0 meson helicity amplitudes at HERMES, emphasizing unnatural parity exchange effects and phase differences.
Findings
Amplitude hierarchy consistent with pQCD
Significant unnatural parity exchange contribution
Large phase difference in leading amplitudes
Abstract
The study of {\rho}0 meson helicity amplitude ratios at HERMES shows that the amplitude hierarchy expected from pQCD is confirmed. The contribution of Unnatural Parity Exchange in the production of {\rho}0 mesons is significant at HERMES kinematics and there is a large phase-difference in the leading F11 and F01 amplitudes. The kinematic dependences of the amplitude ratios only sometimes follow theory-based expectations.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research · Particle physics theoretical and experimental studies