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Precision Measurement of the Proton Spin Structure Function gp1

Precision Measurement of the Proton Spin Structure Function gp1,10.1103/PhysRevLett.74.346,Physical Review Letters,K. Abe,T. Akagi,P. L. Anthony,R. An

Precision Measurement of the Proton Spin Structure Function gp1   (Citations: 22)
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K. Abe, T. Akagi, P. L. Anthony, R. Antonov, R. G. Arnold, T. Averett, H. R. Band, J. M. Bauer, H. Borel, P. E. Bosted, V. Breton, J. Button-Shaferhttp://academic.research.microsoft.com/io.ashx?type=5&id=19208115&selfId1=0&selfId2=0&maxNumber=12&query=
We have measured the ratio gp1/Fp1 over the range 0.029<x<0.8 and 1.3<Q2<10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral 1gp1\(x,Q2\) dx at fixed Q2 = 3 (GeV/c)2 yields 0.127+/-0.004\(stat\)+/-0.010\(syst\), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160+/-0.006. In the quark-parton model, this implies Deltaq = 0.27+/-0.10.
Journal: Physical Review Letters - PHYS REV LETT , vol. 74, no. 3, pp. 346-350, 1995
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