Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering
Abstract
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.
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.Attached Files
Published - AIRprd01a.pdf
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Additional details
- Eprint ID
- 25528
- Resolver ID
- CaltechAUTHORS:20111003-142103087
- Deutscher Akademischer Austausch Dienst (DAAD)
- INTAS
- HCM
- TMR Network Contributions
- European Community
- Department of Energy (DOE)
- Created
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2011-10-05Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field