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DIS off Pions

DIS off Pions. Bogdan Povh Max-Planck-Institut fuer Kernphysik, Heidelberg . Pion signature in experiment: Gottfried Sum rule Polarized structure function Forward neutrons in DIS. DIS on Proton and Deuteron. Gottfried sum rule Spin structure function.

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DIS off Pions

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  1. DIS off Pions Bogdan Povh Max-Planck-Institut fuer Kernphysik, Heidelberg

  2. Pion signature in experiment:Gottfried Sum rulePolarized structure functionForward neutrons in DIS

  3. DIS on Proton and Deuteron • Gottfried sum rule • Spin structure function

  4. NMC detector at CERN Deep inelastic scattering of muons off protons and deuterons Pion signature

  5. Pion signature Gottfried sum rule for flavour symmetric sea

  6. Pion signature

  7. Pion signature Toy model

  8. Forward Neutron Calorimeters at H1 and ZEUS at DESY

  9. FNC – design specifications The size and weight of FNC is defined by the space available in HERA tunnel • position– 105m from the interaction point, size ~ 70 x 70 x 200cm3 , weight <10t • geometrical acceptance is limited by beam-line elements <0.8mrad • should work in high radiation environment A.Bunyatyan “Physics with FNC”

  10. Pion signature H1 detector at HERA collider

  11. A.Bunyatyan “Physics with FNC”

  12. The H1-FNC energy response CERN test-beam Ebeam=120-350 GeV A.Bunyatyan “Physics with FNC”

  13. Neutron and photon energy spectrum measured in H1 -cluster in Preshower = photon, -cluster in main calorimeter and/or Preshower = neutron A.Bunyatyan “Physics with FNC”

  14. Different pion fluxes used in analysis (different form factors)

  15. Rapgap-MC Rapgap-MC after tuning Data Acceptance determined by MC A.Bunyatyan “Physics with FNC”

  16. H1 Publications: • “Measurement of leading proton and neutron production in DIS at HERA” • DESY-98-169 • “Measurement of dijet cross sections in ep interactions with a leading • neutron “, • DESY-04-247 • ZEUS Publications: • “Study of the pion trajectory in the photoproduction of leading neutrons • at HERA” DESY-04-037 • “Photoproduction of D* mesons associated with a leading neutron”” DESY-03-221 • “Leading neutron production in ep collisions at HERA” DESY-02-039 • “Measurement of dijet cross sections for events with a leading neutron in • photoproduction at HERA” • DESY 00-142 • “Observation of events with an energetic forward neutron in DIS at HERA” DESY 96-093 A.Bunyatyan “Physics with FNC”

  17. F2p from ZEUS

  18. F2LN(3) (z=0.7) Gp Xp Data show sensitivity to the parameterizations of the pion structure function (constrained for x (=b)>0.1 from the fixed target experiments). A.Bunyatyan “Physics with FNC”

  19. Comparison of LN production rate for different processes (ZEUS) • e.g. rgp< rjj< rD* ≤ rDIS • Absorption - ratio depends on the transverse size of virtual photon A.Bunyatyan “Physics with FNC”

  20. Pion signature Estimation of the probability of the p→n+p+ in DIS from the neutron rate in DIS extrapolating to the full energy range (for three different pion fluxes}

  21. SU(2) chiral model

  22. Conclusions

  23. Conclusions

  24. Conclusions The constituent quarks are a superposition of the massive quarks and pions

  25. Conclusions Gluonic structure of the nucleon- resolution on the order of 0.3 fm

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