Spin structure of the proton from polarized inclusive deep-inelastic muon-proton scattering
- Adams D
- Adeva B
- Arik E
- Arvidson A
- Badelek B
- Ballintijn MK
- Bardin G
- Baum G
- Berglund P
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- Bird IG
- Birsa R
- Bjorkholm P
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- Cranshaw J
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- vonHarrach D
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- Heusch CA
- Horikawa N
- Hughes VW
- Igo G
- Ishimoto S
- Iwata T
- Kabuss EM
- Karev A
- Kessler HJ
- Ketel TJ
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- Kisselev Y
- Klostermann L
- Kramer D
- Krivokhijine V
- Kroger W
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- Kyynarainen J
- Lamanna M
- Landgraf U
- Layda T
- LeGoff JM
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- Lindqvist T
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- McCarthy JS
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- vanMiddelkoop G
- Miller D
- Mori K
- Moromisato J
- Nagaitsev A
- Nassalski J
- Naumann L
- Niinikoski TO
- Oberski JEJ
- Ogawa A
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- Parks DP
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- Peshekhonov D
- Piegaia R
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- Reyhancan I
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- Roberts JB
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- Schuler KP
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- Smirnov GI
- Staude A
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- Teichert KM
- Tessarotto F
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- Willumeit R
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DOIAbstract
We have measured the spin-dependent structure function g1p in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range 0.003<x<0.7 and 1GeV2<Q2<60GeV2. A next-to-leading order QCD analysis is used to evolve the measured g1p(x,Q2) to a fixed Q02. The first moment of g1p at Q02=10GeV2 is \u3931p=0.136\ub10.013 (stat) \ub10.009 (syst) \ub10.005 (evol). This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge a0 is found to be 0.28\ub10.16. In the Adler-Bardeen factorization scheme, \u394g 432 is required to bring \u394\u3a3 in agreement with the quark-parton model. A combined analysis of all available proton, deuteron, and 3He data...
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