Exclusive omega meson muoproduction on transversely polarised protons
2017 (English)In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 915, 454-475 p.Article in journal (Refereed) Published
Exclusive production of omega 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) < Q(2) < 10(GeV/c)(2), Bjorken scaling variable 0.003 < xBj < 0.3 and transverse momentum squared of the omega meson 0.05(GeV/c)(2) < p(T)(2) < 0.5(GeV/c)(2). The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) Et hat are related to the orbital angular momentum of quarks, the chiral-odd GPDs H-T that are related to the transversity Parton Distribution Functions, and the sign of the pi omega transition form factor. The results are compared to recent calculations of a GPD-based model.
Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 915, 454-475 p.
IdentifiersURN: urn:nbn:se:uu:diva-319125DOI: 10.1016/j.nuclphysb.2016.12.015ISI: 000393702800024OAI: oai:DiVA.org:uu-319125DiVA: diva2:1086530
The COMPASS Collaboration2017-04-032017-04-032017-04-03Bibliographically approved