[Triumf-seminars] TRIUMF Seminar today at 14:00

[postmaster@admin.triumf.ca]

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Date/Time: Thu 2004-12-02 at 14:00

Location:  Auditorium          

Speaker:   Jeurgen Wendland (Department of Physics, UBC and SFU)

Title:     Polarized Parton Distributions Measured at the HERMES Experiment

Abstract: From 1996 to 2000 the HERMES collaboration collected deep inelastic scattering data of longitudinally polarized leptons from longitudinally polarized hydrogen (1996/1997), and deuterium (1998-2000) targets. Inclusive asymmetries on the proton and the deuteron, where only the scattered lepton is detected, were measured with high precision. In semi-inclusive deep-inelastic scattering, at least one final-state hadron is detected in coincidence. Semi-inclusive asymmetries of pions on the proton and pion and kaon asymmetries on the deuteron were measured for the first time. The polarized parton densities of the various quark flavours can be computed from these asymmetries in a probabilistic analysis based on leading-order QCD. The good precision of the asymmetry data permitted a determination of the individual parton densities of the u, d, u{bar}, d{bar}, and s quarks. Recently published results on the asymmetries and the polarized parton densities will be presented.

Stimulants available 15 minutes before the talk.

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