APS » PROLA » Phys. Rev. Lett. » Volume 75 » Issue 1

Phys. Rev. Lett. 75, 25 - 28 (1995)

Precision Measurement of the Deuteron Spin Structure Function g1d
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K. Abe et al. (E143 Collaboration)
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Received 8 March 1995

We report on a high-statistics measurement of the deuteron spin structure function g1d at a beam energy of 29 GeV in the kinematic range 0.029<x<0.8 and 1<Q2<10 (GeV /c)2. The integral γ1d  =  ∫1g1d dx evaluated at fixed Q2  =  3 (GeV /c)2 gives 0.042±0.003(stat)±0.004(syst). Combining this result with our earlier measurement of g1p, we find γ1p-γ1n  =  0.163±0.010(stat)±0.016(syst), which agrees with the prediction of the Bjorken sum rule with O(αs3) corrections, γ1p-γ1n  =  0.171±0.008. We find the quark contribution to the proton helicity to be Δq  =  0.30±0.06.


©1995 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v75/p25
DOI: 10.1103/PhysRevLett.75.25
PACS: 25.30.Fj, 11.55.Hx, 13.60.Hb, 13.88.+e

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