publication . Article . Other literature type . Preprint . 2014

Transverse target spin asymmetries in exclusive ρ0 muoproduction

Adolph, C.; Akhunzyanov, R.; Alekseev, M.G.; Alexakhin, V.Yu.; Alexandrov, Yu.; Alexeev, G.D.; Amoroso, A.; Andrieux, V.; Anosov, V.; Austregesilo, A.; ...
Open Access
  • Published: 01 Jan 2014 Journal: Physics Letters B, volume 731, pages 19-26 (issn: 0370-2693, Copyright policy)
  • Publisher: Elsevier BV
Abstract
Exclusive production of $\rho^0$ 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 as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. The $\sin \phi_S$ asymmetry is found to be $-0.019 \pm 0.008(stat.) \pm 0.003(syst.)$. All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distr...
Subjects
arXiv: High Energy Physics::Experiment
free text keywords: Nuclear and High Energy Physics, 530, Physik, gpd; hemp; polarization; exclusive reactions, High Energy Physics - Experiment, Nuclear Experiment, Particle Physics - Experiment, Asymmetry, media_common.quotation_subject, media_common, Meson, Muon, Spin-½, Transverse plane, Polarization (waves), Particle physics, Nuclear physics, Parton, Physics, Quantum chromodynamics, ddc:530
Funded by
FCT| CERN/FP/109323/2009
Project
CERN/FP/109323/2009
COLLABORATION IN THE COMPASS EXPERIMENT AT CERN
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: 109323
  • Funding stream: 5876-PPCDTI
,
EC| HADRONPHYSICS3
Project
HADRONPHYSICS3
Study of Strongly Interacting Matter
  • Funder: European Commission (EC)
  • Project Code: 283286
  • Funding stream: FP7 | SP4 | INFRA
,
FCT| CERN/FP/123600/2011
Project
CERN/FP/123600/2011
COLLABORATION IN THE COMPASS EXPERIMENT AT CERN
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: 123600
  • Funding stream: COMPETE
,
FCT| CERN/FP/116376/2010
Project
CERN/FP/116376/2010
COLLABORATION IN THE COMPASS EXPERIMENT AT CERN
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: 116376
  • Funding stream: 5876-PPCDTI
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