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Exclusive omega meson muoproduction on transversely polarised protons
Univ Erlangen Nurnberg, Phys Inst, D-91054 Erlangen, Germany..
Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
Joint Inst Nucl Res, Dubna, Moscow Region, Russia..
Univ Turin, Dept Phys, I-10125 Turin, Italy..
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2017 (engelsk)Inngår i: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 915, s. 454-475Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

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ELSEVIER SCIENCE BV , 2017. Vol. 915, s. 454-475
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Identifikatorer
URN: urn:nbn:se:uu:diva-319125DOI: 10.1016/j.nuclphysb.2016.12.015ISI: 000393702800024OAI: oai:DiVA.org:uu-319125DiVA, id: diva2:1086530
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The COMPASS Collaboration

Tilgjengelig fra: 2017-04-03 Laget: 2017-04-03 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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