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27 April 2024

» pubmed » pmid11017275

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Measurement of the spin asymmetry in the photoproduction of pairs of high- p(T) hadrons at HERMES
K McIlhany ; R D McKeown ; F Meissner ; F M Menden ; A Metz ; N Meyners ; O Mikloukho ; C A Miller ; M A Miller ; R Milner ; A Most ; V Muccifora ; Y Naryshkin ; A M Nathan ; F Neunreither ; M Niczyporuk ; W Nowak ; T G O’Neill ; R Openshaw ; J Ouyang ; B R Owen ; S F Pate ; S Potashov ; D H Potterveld ; G Rakness ; R Redwine ;
Date:	20 Mar 2000
Journal:	Phys Rev Lett, 84 (12), 2584-8
Abstract:	We present a measurement of the longitudinal spin asymmetry A(\|\|) in photoproduction of pairs of hadrons with high transverse momentum p(T). 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(h(1))(T)>1.5 GeV/c and p(h(2))(T)>1.0 GeV/c, the measured asymmetry is A(\|\|) = -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.
Source:	PubMed, pmid11017275
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