Exclusive ω meson muoproduction on transversely polarised protons

The COMPASS Collaboration

Research output: Contribution to journalArticle

Abstract

Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/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<pT 2<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.

Original languageEnglish (US)
Pages (from-to)454-475
Number of pages22
JournalNuclear Physics B
Volume915
DOIs
StatePublished - Feb 1 2017

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partons
mesons
protons
asymmetry
COMPASS (programming language)
transverse momentum
form factors
muons
angular momentum
distribution functions
quarks
scaling
orbitals
photons
scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Exclusive ω meson muoproduction on transversely polarised protons. / The COMPASS Collaboration.

In: Nuclear Physics B, Vol. 915, 01.02.2017, p. 454-475.

Research output: Contribution to journalArticle

The COMPASS Collaboration. / Exclusive ω meson muoproduction on transversely polarised protons. In: Nuclear Physics B. 2017 ; Vol. 915. pp. 454-475.
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abstract = "Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/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 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<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.",
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N2 - Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/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 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<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.

AB - Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/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 0.003Bj<0.3 and transverse momentum squared of the ω meson 0.05 (GeV/c)2T 2<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.

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