Hard Exclusive \rho^0-Meson Production at COMPASS
H. Wollny (for the COMPASS collaboration)
TL;DR
This paper presents new measurements of azimuthal asymmetries in exclusive ho^0-meson production at COMPASS, providing insights into the nucleon's internal structure and quark orbital angular momentum.
Contribution
First measurement of the transverse target spin azimuthal asymmetry in exclusive ho^0 production at COMPASS, probing the GPD E related to quark orbital angular momentum.
Findings
Measured asymmetry A_{UT}^{sin( heta- heta_S)} on ^6LiD and NH_3 targets
Results sensitive to the nucleon helicity-flip GPD E
Provides new experimental data for nucleon structure studies
Abstract
New results for the transverse target spin azimuthal asymmetry A_{UT}^{sin(\phi-\phi_S)} for hard exclusive \rho^0-meson production on a transversely polarised ^6LiD and NH_3 target will be presented. The measurement was performed with the COMPASS detector using the 160 GeV/c muon beam of the SPS at CERN. The asymmetry is sensitive to the nucleon helicity-flip generalised parton distribution E, which is related to the orbital angular momentum of quarks in the nucleon.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Superconducting Materials and Applications · Quantum Chromodynamics and Particle Interactions