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- W2602714643 abstract "Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(mathrm{GeV}/c)^2$$ . The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam impinging on a polarised $$^6$$ LiD target. By analysing the full range in hadron transverse momentum $$p_mathrm{T}$$ , the different $$p_mathrm{T}$$ -dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation $$Delta g/g$$ is evaluated at leading order in pQCD at a hard scale of $$mu ^2= langle Q^2 rangle = 3 (mathrm{GeV}/c)^2$$ . It is determined in three intervals of the nucleon momentum fraction carried by gluons, $$x_mathrm{g}$$ , covering the range $$0.04 !<! x_{ mathrm g}! <! 0.28$$ and does not exhibit a significant dependence on $$x_mathrm{g}$$ . The average over the three intervals, $$langle Delta g/g rangle = 0.113 pm 0.038_mathrm{(stat.)}pm 0.036_mathrm{(syst.)}$$ at $$langle x_mathrm{g} rangle approx 0.10$$ , suggests that the gluon polarisation is positive in the measured $$x_mathrm{g}$$ range." @default.
- W2602714643 created "2017-04-07" @default.
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