Details

Autor(en) / Beteiligte

• Fanelli, C
• Cisbani, E
• Hamilton, D J
• Salmé, G
• Wojtsekhowski, B
• Ahmidouch, A
• Annand, J R M
• Baghdasaryan, H
• Beaufait, J
• Bosted, P
• Brash, E J
• Butuceanu, C
• Carter, P
• Christy, E
• Chudakov, E
• Danagoulian, S
• Day, D
• Degtyarenko, P
• Ent, R
• Fenker, H
• Fowler, M
• Frlez, E
• Gaskell, D
• Gilman, R
• Horn, T
• Huber, G M
• de Jager, C W
• Jensen, E
• Jones, M K
• Kelleher, A
• Keppel, C
• Khandaker, M
• Kohl, M
• Kumbartzki, G
• Lassiter, S
• Li, Y
• Lindgren, R
• Lovelace, H
• Luo, W
• Mack, D
• Mamyan, V
• Margaziotis, D J
• Markowitz, P
• Maxwell, J
• Mbianda, G
• Meekins, D
• Meziane, M
• Miller, J
• Mkrtchyan, A
• Mkrtchyan, H
• Mulholland, J
• Nelyubin, V
• Pentchev, L
• Perdrisat, C F
• Piasetzky, E
• Prok, Y
• Puckett, A J R
• Punjabi, V
• Shabestari, M
• Shahinyan, A
• Slifer, K
• Smith, G
• Solvignon, P
• Subedi, R
• Wesselmann, F R
• Wood, S
• Ye, Z
• Zheng, X

Titel

Polarization Transfer in Wide-Angle Compton Scattering and Single-Pion Photoproduction from the Proton

Ist Teil von

• Physical review letters, 2015-10, Vol.115 (15), p.152001-152001, Article 152001

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2015

Link zum Volltext

Quelle

PROLA

Beschreibungen/Notizen

• Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of the polarization transfer from a circularly polarized photon beam to the recoil proton. The wide-angle Compton scattering polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of θ_{cm}^{p}=70°. The longitudinal transfer K_{LL}, measured to be 0.645±0.059±0.048, where the first error is statistical and the second is systematic, has the same sign as predicted for the reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton. However, the observed value is ~3 times larger than predicted by the generalized-parton-distribution-based calculations, which indicates a significant unknown contribution to the scattering amplitude.