Isoscalar Extraction of ΔS in the Nucleon at Hermes from Semi-Inclusive Dis

Details Isoscalar Extraction of ΔS in the Nucleon at Hermes from Semi-Inclusive Dis Isoscalar Extraction of ΔS in the Nucleon at Hermes from Semi-Inclusive Dis

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006fuin.conf..254l&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the 21st Lake Louise Winter Institute. Held 17-23 February 2006 in Lake Louise, Alberta

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Scientific paper

The helicity density of the strange quark sea in the proton has been extracted from measurements of polarized semi-inclusive production of charged kaons in deep inelastic scattering of positrons from a polarized deuteron target. The isoscalar nature of the deuteron (assuming isospin symmetry) and lack of isospin for strange quarks allows the deuteron target to be used independently without relying on fragmentation models or other experimental data. In the region of measurement x > 0.02 the helicity density is zero within the experimental error and agrees with a previous five flavor extraction performed by HERMES. The first moment of the axial charge in the measured region is substantially less than that inferred from LO (NLO) QCD fits that cover the entire x-range.

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