We have measured the moment AsinϕLU corresponding to the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering. AsinϕLU 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 (π+, π0 and π−) were measured simultaneously over a large range of kinematics within the virtuality range Q2≈ 1.0–4.5  GeV2. The observable was measured with better than 1% statistical precision over a large range of z, PT, xB, and Q2, 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 π− sinϕ moment.

Gohn, W., Avakian, H., Joo, K., Ungaro, M., Adhikari K, P., Aghasyan, M., et al. (2014). Beam-spin asymmetries from semi-inclusive pion electroproduction. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89, 072011 [10.1103/PhysRevD.89.072011].

Beam-spin asymmetries from semi-inclusive pion electroproduction

D'ANGELO, ANNALISA;
2014-01-01

Abstract

We have measured the moment AsinϕLU corresponding to the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering. AsinϕLU 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 (π+, π0 and π−) were measured simultaneously over a large range of kinematics within the virtuality range Q2≈ 1.0–4.5  GeV2. The observable was measured with better than 1% statistical precision over a large range of z, PT, xB, and Q2, 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 π− sinϕ moment.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.89.072011
Gohn, W., Avakian, H., Joo, K., Ungaro, M., Adhikari K, P., Aghasyan, M., et al. (2014). Beam-spin asymmetries from semi-inclusive pion electroproduction. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89, 072011 [10.1103/PhysRevD.89.072011].
Gohn, W; Avakian, H; Joo, K; Ungaro, M; Adhikari K, P; Aghasyan, M; Amaryan M, J; Anderson M, D; Pereira S, A; Ball, J; Baltzell N, A; Battaglieri, M;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/94988
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