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PION STRUCTURE FUNCTION AND MORE

PION STRUCTURE FUNCTION AND MORE. Pion signature in experiment: Forward neutrons in DIS Gottfried Sum rule. Forward Neutron Calorimeters at H1 and ZEUS at DESY. FNC – design specifications. The size and weight of FNC is defined by the space available in HERA tunnel.

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PION STRUCTURE FUNCTION AND MORE

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  1. PION STRUCTURE FUNCTION AND MORE

  2. Pion signature in experiment:Forward neutrons in DISGottfried Sum rule

  3. Forward Neutron Calorimeters at H1 and ZEUS at DESY

  4. 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”

  5. Pion signature H1 detector at HERA collider

  6. A.Bunyatyan “Physics with FNC”

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

  8. 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”

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

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

  11. 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”

  12. F2p from ZEUS

  13. 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”

  14. 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”

  15. 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}

  16. DIS on Proton and Deuteron

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

  18. Pion signature Gottfried sum rule for flavour symmetric sea

  19. Pion signature

  20. Pion signature Interpretation

  21. Conclusions

  22. Conclusions

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

  24. Spontaneous breaking of the chiral symmetry and fossil pions

  25. Chiral symmetry breaking • Nambu-Jona-Lasinio Model

  26. Chiral symmetry breaking

  27. Chiral symmetry breaking

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

  29. Conclusions u d u u u d d Microscopic view of the chiral symmetry breaking The interaction that is responsible for giving the mass to quarks binds quark-antiquark to a pion

  30. Chiral symmetry breaking

  31. Chiral symmetry breaking • Nambu-Jona-Lasinio Model in Cartoons

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