Abstract
Spin Density Matrix Elements (SDMEs) are determined for exclusive ω meson production on unpolarized protons, in the COMPASS kinematic region of 1.0 (GeV/c)2 < Q2 < 10.0 (GeV/c)2, 5.0 GeV/c2 < W < 17.0 GeV/c2 and . Using extracted the preliminary SDMEs values the hypothesis of S-Channel Helicity Conservation (SCHC) is studied. Certain matrix elements that correspond to the transition indicate violation of SCHC in exclusive ω production. A sizable contribution of unnatural parity exchange amplitudes is found for exclusive ω meson muoproduction, and there is a clear indication of its decrease with increasing W. The extracted longitudinal-to-transverse cross section ratio is 0.553 ± 0.044 ± 0.020.
Highlights
Spin Density Matrix Elements (SDMEs) are determined for exclusive ω meson production on unpolarized protons, in the COMPASS kinematic region of 1.0 (GeV/c)2 < Q2 < 10.0 (GeV/c)2, 5.0 GeV/c2 < W < 17.0 GeV/c2 and 0.01 (GeV/c)2 < p2T < 0.5 (GeV/c
Hard Exclusive Meson Production (HEMP) allows to study various quark-flavor combinatios of Generalized Parton Distributions (GPDs) and reaction mechanism. Most of this information we get from Spin Density Matrix Elements (SDMEs), wchich determine angular distributions of the particles from the decay of the vector meson
In case when contributions of transverse and longitudinal photons cannot be separated, the SDMEs are customarily defined as rλ04V λV = (ρ0λV λV + Rρ4λV λV )(1 + R)−1, rλαV λV =
Summary
Spin Density Matrix Elements (SDMEs) are determined for exclusive ω meson production on unpolarized protons, in the COMPASS kinematic region of 1.0 (GeV/c)2 < Q2 < 10.0 (GeV/c)2, 5.0 GeV/c2 < W < 17.0 GeV/c2 and 0.01 (GeV/c)2 < p2T < 0.5 (GeV/c)2. The study of Hard Exclusive Meson Production (HEMP) allows to constrain models of Generalized Parton Distributions (GPDs).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
