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Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT
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文摘
We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality View the MathML source for transverse hadron momenta pT in the range 1 GeV/c to 4 GeV/c. They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised 6LiD or NH3 targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation ΔG   inside the nucleon in the range of the nucleon momentum fraction carried by gluons 0.05<xg<0.2.

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