期刊
PHYSICAL REVIEW D
卷 89, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.072011
关键词
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资金
- U.S Department of Energy [DE-FG02-04ER41309]
- U.S. National Science Foundation
- Italian Istituto Nazionale di Fisica Nucleare
- French Centre National de la Recherche Scientifique
- French Commissariat a l'Energie Atomique
- United Kingdom's Science and Technology Facilities Council
- Chilean Comision Nacional de Investigacion Cientifica y Tecnologica
- Scottish Universities Physics Alliance
- National Research Foundation of Korea
- US Department of Energy [DE-AC05-84ER40150]
- STFC [ST/L005719/1, ST/J000175/1] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-FG02-04ER41309] Funding Source: U.S. Department of Energy (DOE)
- Science and Technology Facilities Council [ST/L005719/1, 1511780, 1096291, ST/J000175/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1306737] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205782] Funding Source: National Science Foundation
We have measured the moment A(LU)(sin phi) corresponding to the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering. A(LU)(sin phi) is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (pi(+),pi(0) and pi(-)) were measured simultaneously over a large range of kinematics within the virtuality range Q(2) approximate to 1.0- 4.5 GeV2. The observable was measured with better than 1% statistical precision over a large range of z, P-T, x(B), and Q(2), which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the pi(-) sin phi moment.
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