Measurement of the spin asymmetry in the photoproduction of pairs of high- p(T) hadrons at HERMES

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...

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Published inPhysical review letters Vol. 84; no. 12; p. 2584
Main Authors McIlhany, K, McKeown, RD, Meissner, F, Menden, FM, Metz, A, Meyners, N, Mikloukho, O, Miller, CA, Miller, MA, Milner, R, Most, A, Muccifora, V, V, Naryshkin, Y, Nathan, AM, Neunreither, F, Niczyporuk, M, Nowak, W, O'Neill, TG, Openshaw, R, Ouyang, J, Owen, BR, Pate, SF, Potashov, S, Potterveld, DH, Rakness, G, Redwine, R
Format Journal Article
LanguageEnglish
Published United States 20.03.2000
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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.
AbstractList 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.
Author Muccifora, V, V
Rakness, G
Meyners, N
Mikloukho, O
Miller, CA
Meissner, F
Nowak, W
Owen, BR
Potashov, S
Miller, MA
Redwine, R
Menden, FM
Naryshkin, Y
Nathan, AM
O'Neill, TG
Milner, R
Potterveld, DH
Openshaw, R
Niczyporuk, M
McKeown, RD
Ouyang, J
Neunreither, F
Most, A
Pate, SF
Metz, A
McIlhany, K
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Snippet We present a measurement of the longitudinal spin asymmetry A(||) in photoproduction of pairs of hadrons with high transverse momentum p(T). Data were...
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Title Measurement of the spin asymmetry in the photoproduction of pairs of high- p(T) hadrons at HERMES
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