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Full text not available from this repository.Abstract
We present a measurement of the longitudinal spin asymmetry Ali in photoproduction of pairs of hadrons with high transverse momentum pi. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h(+)h(-) pairs with p(T)(h1) > 1.5 GeV/c and p(T)(h2) > 1.0 GeV/c, the measured asymmetry is A(parallel to) = -0.28 +/- 0.12(stat) +/- 0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering: from protons, and is interpreted to arise from a positive gluon polarization.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DEEP-INELASTIC-SCATTERING; LEPTON-NUCLEON SCATTERING; MONTE-CARLO GENERATOR; ORDER QCD ANALYSIS; QUARK DISTRIBUTIONS; POLARIZED GLUON; HERA; COLLISIONS; MESONS; PROTON; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 May 2022 09:39 |
| Last Modified: | 24 May 2022 09:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42735 |
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