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T: Fachverband Teilchenphysik

T 412: QCD Experiment II

T 412.5: Talk

Thursday, March 8, 2007, 17:50–18:05, INF 327 SR 2

High Q² Neutral Current ep scattering with longitudinally polarized leptons at Hera — •Michal Wlasenko — Physikalisches Institut, Universität Bonn, Deutschland

Since 2003 HERA collides longitudinally polarized lepton beam with proton beam, extending our understanding of ep scattering to so far unmeasured helicity-dependent terms of the cross sections and structure functions, given high luminosity (L > 400 pb⁻¹) and longitudinal polarization up to ± 40%. Exploiting the kinematical region of x∈(10⁻⁶,0.75), Q² ∈ (0.11,5·10⁴ GeV²) both ZEUS and H1 experiments measure CC and NC cross sections and unfold F₂ and xF₃ structure functions. Results are then combined into a NLO-QCD fit giving xS, xd_v, xu_v (sea and valence quark density functions) and xg (gluon density function).

In my talk, I will present the current status of NC measurement at high Q² with ZEUS. I will also discuss the possibility of measuring the full form of NC structure functions.