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Final COMPASS results on the deuteron spin-dependent structure function g(1)(d) and the Bjorken sum rule
Univ Erlangen Nurnberg, Phys Inst, D-91054 Erlangen, Germany..
INFN, Trieste Sect, I-34127 Trieste, Italy..
Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
Univ Turin, Dept Phys, I-10125 Turin, Italy..
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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 769, p. 34-41Article in journal (Refereed) Published
Abstract [en]

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a 6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1 (GeV/c)2 < Q2 < 100 (GeV/c)2 in photon virtuality, 0.004 < x < 0.7 in the Bjorken scaling variable and W > 4GeV/c2 in the mass of the hadronic final state. The deuteron double-spin asymmetry A(1)(d) and the deuteron longitudinal-spin structure function g(1)(d) are presented in bins of x and Q2. Towards lowest accessible values of x, g(1)(d) decreases and becomes consistent with zero within uncertainties. The presented final g(1)(p) values together with the recently published final g(1)(p) values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1 world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour singlet axial charge a0, which is identified in the MS renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2 = 3 (GeV/c)2) = 0.32 +/- 0.02stat +/- 0.04syst +/- 0.05evol. Together with the recent results on the proton spin structure function g(1)(p), the results on g(1)(d) constitute the COMPASS legacy on the measurements of g1 through inclusive spin-dependent deep inelastic scattering.

Place, publisher, year, edition, pages
2017. Vol. 769, p. 34-41
Keywords [en]
COMPASS, Deep inelastic scattering, Spin, Structure function, Parton helicity distributions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-327375DOI: 10.1016/j.physletb.2017.03.018ISI: 000402342500006OAI: oai:DiVA.org:uu-327375DiVA, id: diva2:1130557
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-09-04Bibliographically approved

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