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Evidence for a Single-Spin Azimuthal Asymmetry in Semi-inclusive Pion Electroproduction

Airapetian, A. and Bray, B. and Carter, P. and Dvoredsky, A. and Filippone, B. W. and Korsch, W. and McIlhany, K. and McKeown, R. D. and Pitt, M. (2000) Evidence for a Single-Spin Azimuthal Asymmetry in Semi-inclusive Pion Electroproduction. Physical Review Letters, 84 (18). pp. 4047-4051. ISSN 0031-9007. doi:10.1103/PhysRevLett.84.4047.

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Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle φ of the pion relative to the lepton scattering plane was formed for π^+ electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sinφ moment of the cross section is 0.022±0.005±0.003. This result can be interpreted as the effect of terms in the cross section involving chiral-odd spin distribution functions in combination with a chiral-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.

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Filippone, B. W.0000-0002-2618-2688
Additional Information:© 2000 The American Physical Society. Received 28 October 1999; published in the issue dated 1 May 2000. We thank M. Anselmino, J. Collins, A. M. Kotzinian, and P. J. Mulders for many interesting discussions. We gratefully acknowledge the DESY management for its support, the staffs at DESY and the collaborating institutions for their significant effort, and our funding agencies for financial support.
Issue or Number:18
Classification Code:PACS: 13.87.Fh, 13.60.-r, 13.88.+e, 14.20.Dh
Record Number:CaltechAUTHORS:20111122-154656485
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Official Citation:Evidence for a Single-Spin Azimuthal Asymmetry in Semi-inclusive Pion Electroproduction A. Airapetian et al. ((The HERMES Collaboration)) pp. 4047-4051
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27930
Deposited By: Ruth Sustaita
Deposited On:23 Nov 2011 15:31
Last Modified:09 Nov 2021 16:53

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