Recent results on the helicity structure of the nucleon from HERMES

Details Recent results on the helicity structure of the nucleon from HERMES Recent results on the helicity structure of the nucleon from HERMES

2002-10-21

arxiv.org/abs/hep-ex/0210049v1

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures, to appear in Proceedings of the Workshop "Testing QCD through Spin Observables in Nuclear Targets", Charlo

Scientific paper

The HERMES experiment has measured double spin asymmetries of inclusive and semi-inclusive cross sections for the production of charged hadrons in deep-inelastic scattering of polarised positrons on polarised hydrogen and deuterium targets, in the kinematic range 0.023 < x < 0.6, and 1 GeV^2 < Q^2 < 15 GeV^2. For the data taken on the deuterium target, a RICH detector provides the complete identification of charged pions and kaons. From the inclusive measurements on deuterium, the polarised structure function g_1^d has been extracted with high precision. Together with the semi-inclusive measurements, quark polarisations are extracted separately for the u, ubar, d, dbar, and (s + sbar) flavours in a LO QCD analysis. Furthermore, a possible breaking of flavour symmetry in the polarised light sea, (Delta ubar - Delta dbar), was measured for the first time and found to be consistent with zero within the experimental precision.

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