Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction
Collaboration
27 pages
Published in:
- Eur.Phys.J.C 71 (2011) 1609
e-Print:
- 1012.3676 [hep-ex]
Report number:
- DESY-10-229
Experiments:
View in:
Citations per year
Abstract: (arXiv)
Exclusive rho^0-meson electroproduction is studied in the HERMES experiment, using a 27.6 GeV longitudinally polarized electron/positron beam and unpolarized hydrogen and deuterium targets in the kinematic region 0.5 GeV^2 < Q^2 < 7.0 GeV^2, 3.0 GeV < W < 6.3 GeV, and -t' < 0.4 GeV^2. Real and imaginary parts of the ratios of the natural-parity-exchange helicity amplitudes T_{11} (\gamma^*_T --> \rho_T), T_{01} (\gamma^*_T --> \rho_L), T_{10} (\gamma^*_L --> \rho_T), and T_{1-1} (\gamma^*_{-T} -->\rho_T) to T_{00} (\gamma^*_L --> \rho_L) are extracted from the data. For the unnatural-parity-exchange amplitude U_{11}, the ratio |U_{11}/T_{00}| is obtained. The Q^2 and t' dependences of these ratios are presented and compared with perturbative QCD predictions.Note:
- 27 pages, 8 tables, 13 figures/ minor textual changes on pages 2, 3,9, 10, 11, and some changes to the list of references
- rho(770)0: electroproduction
- electron: polarized beam
- positron: polarized beam
- quantum chromodynamics: perturbation theory
- parity: exchange
- helicity: amplitude analysis
- HERMES
- electron p: exclusive reaction
- electron deuteron: exclusive reaction
- polarization: longitudinal
References(51)
Figures(23)