Exclusive ω meson muoproduction on transversely polarised protons - INSPIRE

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Exclusive ω meson muoproduction on transversely polarised protons

COMPASS

Collaboration

•

C. Adolph
(
- Erlangen - Nuremberg U.
)

Jun 12, 2016

22 pages

Published in:

Nucl.Phys.B 915 (2017) 454-475,
Nucl.Phys.B 915 (2017) 454-475

Published: Feb, 2017

e-Print:

1606.03725 [hep-ex]

DOI:

10.1016/j.nuclphysb.2016.12.015 (publication)

Report number:

CERN-EP-2016-157

Experiments:

CERN-SPS-NA58

View in:

reference search17 citations

Citations per year

Abstract: (Elsevier B.V.)

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} < Q^{2} < 10 {(GeV / c)}^{2}

, Bjorken scaling variable

0.003 < x_{Bj} < 0.3

and transverse momentum squared of the ω 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) E that 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 πω transition form factor. The results are compared to recent calculations of a GPD-based model.

Note:

23 pages, 9 figures

muon+ p: scattering
muon nucleus: nuclear reaction
polarized target: transverse
parton: distribution function
angular distribution: asymmetry
quark: angular momentum
form factor: transition
omega(783): exclusive production
omega(783): leptoproduction
scaling: Bjorken

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