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The Structure Functions and low x working group summary

The Structure Functions and low x working group summary. Vladimir Chekelian, Claire Gwenlan, Robert Thorne. - HERA Results (VC) - FNAL, RHIC, JLAB (CG) & new techniques for data analysis

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The Structure Functions and low x working group summary

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  1. The Structure Functions and low x working group summary Vladimir Chekelian, Claire Gwenlan, Robert Thorne - HERA Results (VC) - FNAL, RHIC, JLAB (CG) & new techniques for data analysis - Theory (RT) Summary of the "SF & low x" WG

  2. Joint SF & EW session Total CC cross sections with longitudinally polarised e+ and e- e+p: the first HERA II publications Phys. Lett. B 634 (2006) 173 (H1), hep-ex 0602026 (ZEUS) B. Antunovic H. Kaji Pe=(NR-NL)/(NR+NL) - linear dependence is firmly established for e+& e- e-p • - extrapolations to Pe=  1: 95% CL • H1: M(WR)> • s(P=-1)= -3.92.3(sta)0.7(sys)0.8(pol) pb 208GeV • s(P=1) = -0.92.9(sta)1.9(sys)2.9(pol) pb 186GeV • ZEUS: • s(P=-1)= 7.4  3.9(sta)  1.2(sys) pb • s(P=1) = 0.8  3.1(sta)  5.0(sys) pb 180 GeV e+p  consistent with the absence of the right-handed weak currents Summary of the "SF & low x" WG

  3. Joint SF & EW session Total CC cross sections with longitudinally polarised e+ and e- e+p: the first HERA II publications Phys. Lett. B 634 (2006) 173 (H1), hep-ex 0602026 (ZEUS) B. Antunovic H. Kaji e-p e+p  consistent with the absence of the right-handed weak currents Summary of the "SF & low x" WG

  4. Joint SF & EW session HERA II: CC cross sections d/dQ2 B. Antunovic H. Kaji Summary of the "SF & low x" WG

  5. Joint SF & EW session HERA II: NC cross sections d/dQ2 A. Nikiforov U. Noor Each experiment: 2 lepton beam polarities and 2 polarisation periods Summary of the "SF & low x" WG

  6. Joint SF & EW session NC: polarisation ratios (RH)/(LH) A. Nikiforov U. Noor e+p e+p e-p e-p Polarisation effects in NC are established Summary of the "SF & low x" WG

  7. Joint SF & EW session HERA II: Unpolarised NC U. Noor A. Nikiforov e-p lumi at HERA II: ~ 6 fold of HERA I  determine xF3 Summary of the "SF & low x" WG

  8. Joint SF & EW session Structure Function xF3 A. Nikiforov U. Noor U. Noor Precision of xF3 is improved by ~ 20% due to larger e-p statisatics at HERA II Summary of the "SF & low x" WG

  9. Joint SF & EW session PDFs in the ZEUS EW&QCD fit Coherent EW+PDF analysis based on ZEUS-JETS fit - include also polarised NC&CC double diff. cross sections S. Shimizu HERA I HERA I+II  PDFs are almost unchanged  uncertainty on xuv is reduced Summary of the "SF & low x" WG

  10. Joint SF & EW session Light quark couplings to Z S. Shimizu aq,vq • - polarised data •  improve Vu,Vd • - more precise for u • - comparable precision • - help to resolve • LEP ambiguities Summary of the "SF & low x" WG

  11. Joint SF & HF session Discussion on mass effects / heavy flavour PDF’s P. Laycock  will be summarised by HF group F2cc vs Q2 F2bb vs Q2  F2cc, F2bb are included into latest global fits Eur. Phys. J. C45 (2006) 23 Eur. Phys. J. C40 (2005) 349 Summary of the "SF & low x" WG

  12. SF session: FL and high x at HERA ZEUS NC at highest x - make use of Ejet, Jjet and events without jets (lost in the beam pipe) to access high x -> highest x point is an integrated cross section up to x=1 A. Caldwell e-p measured for e+p 99-00, e-p 98-99, e+p 96-97 - intergated points: tendency to lie above CTEQ6D - input to PDF fits at high x Summary of the "SF & low x" WG

  13. SF session: FL and high x at HERA Prospects for direct FL measur. at HERA Both H1 and ZEUS expressed interest in the low proton beam energy running to measure longitudinal structure function FL(x,Q2)  SF WG: D.Kollar (ZEUS), M. Klein (H1)  Plenary: A. Caldwell ZEUS D. Kollar Duration: ~ 3 months Proton energy: 460 GeV Lumi: 10 pb-1 plus usual running at Ep = 920 GeV Summary of the "SF & low x" WG

  14. SF session: FL and high x at HERA Prospects for direct FL measur. at HERA M. Klein FL FLD Summary of the "SF & low x" WG

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