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Structure functions at low x and Q 2 at ZEUS

Structure functions at low x and Q 2 at ZEUS. 8th International Workshop on Deep Inelastic Scattering and QCD Liverpool, April 2000. Jonathan Scott ZEUS Collaboration. University of Bristol. Introduction. HERA provides a unique opportunity to explore

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Structure functions at low x and Q 2 at ZEUS

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  1. Structure functions at low x and Q2 at ZEUS 8th International Workshop on Deep Inelastic Scattering and QCD Liverpool, April 2000 Jonathan Scott ZEUS Collaboration University of Bristol

  2. Introduction HERA provides a unique opportunity to explore the transition region between perturbative and non perturbative QCD. The kinematic region at low Q2 and x can be reached using small angle detectors and Initial State radiative events. • This presentation • Kinematics • BPC/BPT Detectors • Results • Possibilities from ISR • Summary

  3. Kinematics 1 27.5GeV positrons 820GeV protons Negative 4-momentum squared of virtual photon Bjorken scaling Fractional energy loss of electron in proton rest frame Mass2 of Hadronic system

  4. Kinematics 2 Differential cross section for * + p  X is FL Longitudinal structure function - relevant at high y xF3 - Parity violating Term Low x approximation

  5. Kinematic Region Lowest Q2 bin  0.045GeV2 Highest y bin 0.84 Lowest y bin  0.005

  6. BPC/BPT

  7. BPC/BPT Bins High yE´e > 4.4GeVElectron Method Medium yE´e > 7GeVElectron Method Low y(+prescale)E´e > 20GeVSigma Method

  8. BPC/BPT event selection

  9. Control Plots

  10. Control Plots

  11. Results

  12. Results

  13. Results

  14. ISR

  15. FL

  16. ISR Kinematic range Bridges Q2 range between BPC/BPT and nominal F2 analyses as well as overlap in y with Fixed Target experiments

  17. Summary

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