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Article
Report number arXiv:1606.03725 ; CERN-EP-2016-157
Title Exclusive ω meson muoproduction on transversely polarised protons
Related titleExclusive ω meson muoproduction on transversely polarised protons
Author(s) COMPASS Collaboration  Prikaži svih 229 autora
Publication 2017-02
Imprint 12 Jun 2016
Number of pages 22
Note 23 pages, 9 figures
In: Nucl. Phys. B 915 (2017) 454-475
DOI 10.1016/j.nuclphysb.2016.12.015
Subject category nucl-ex ; Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; COMPASS NA58
Free keywords QCD ; polarization ; experimental results ; SIDIS ; transversely polarised ; exclusive ; omega ; GPDs
Abstract Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1(GeV/c)2<Q2<10(GeV/c)2, Bjorken scaling variable 0.003<xBj<0.3 and transverse momentum squared of the ω meson 0.05(GeV/c)2<pT2<0.5(GeV/c)2. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) E that are related to the orbital angular momentum of quarks, the chiral-odd GPDs HT that are related to the transversity Parton Distribution Functions, and the sign of the πω transition form factor. The results are compared to recent calculations of a GPD-based model.
Copyright/License arXiv nonexclusive-distrib. 1.0
preprint: © 2016-2025 CERN (License: CC-BY-4.0)
publication: © 2017-2025 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³



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 Zapis kreiran 2016-06-14, zadnja izmjena 2024-07-20


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