Single spin asymmetries in charged pion production from semi-inclusive deep inelastic scattering on a transversely polarized 3He Target at Q2 = 1.4-2.7 GeV2.
Phys Rev Lett
; 107(7): 072003, 2011 Aug 12.
Article
em En
| MEDLINE
| ID: mdl-21902386
ABSTRACT
We report the first measurement of target single spin asymmetries in the semi-inclusive (3)He(e,e'π(±))X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16 < x < 0.35 with 1.4 < Q(2) < 2.7 GeV(2). The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The π(±) Collins moments for (3)He are consistent with zero, except for the π(+) moment at x = 0.35, which deviates from zero by 2.3σ. While the π(-) Sivers moments are consistent with zero, the π(+) Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to (3)He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.
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01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Prognostic_studies
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Qualitative_research
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos