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Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering

Airapetian, A. and Filippone, B. W. and McIlhany, K. and Tipton, B. (2001) Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering. Physical Review D, 64 (9). Art. No. 097101. ISSN 2470-0010. doi:10.1103/PhysRevD.64.097101.

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A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analyzing power in the sinφ moment of the cross section is 0.019±0.007(stat)±0.003(syst). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The π^0 asymmetry is of the same size as the π^+ asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.

Item Type:Article
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Filippone, B. W.0000-0002-2618-2688
Additional Information:© 2001 The American Physical Society. Received 4 April 2001; published 5 October 2001. We thank M. Anselmino, R. L. Jaffe, A. M. Kotzinian, and P. J. Mulders for many interesting discussions on this subject. 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. Additional support for this work was provided by the DAAD and INTAS, HCM, TMR network contributions from the European Community, and the U.S. Department of Energy.
Funding AgencyGrant Number
Deutscher Akademischer Austausch Dienst (DAAD)UNSPECIFIED
TMR Network ContributionsUNSPECIFIED
European CommunityUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Issue or Number:9
Classification Code:PACS: 13.87.Fh, 13.60.-r, 13.88.+e, 14.20.Dh
Record Number:CaltechAUTHORS:20111003-142103087
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25528
Deposited By: Tony Diaz
Deposited On:05 Oct 2011 16:46
Last Modified:09 Nov 2021 16:34

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