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Measurements of inclusive and exclusive particle production at ZEUS

Measurements of inclusive and exclusive particle production at ZEUS. Igor Kadenko, Taras Shevchenko National University of Kyiv Department of Nuclear Physics (on behalf of the ZEUS Collaboration). Outline. Particle production in high energy electron proton scattering.

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Measurements of inclusive and exclusive particle production at ZEUS

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  1. Measurements of inclusive and exclusive particle production at ZEUS Igor Kadenko, Taras Shevchenko National University ofKyiv Department of Nuclear Physics (on behalf of the ZEUS Collaboration)

  2. Outline • Particle production in high energy electron proton scattering. • Experimental setup: HERA accelerator and ZEUS detector. • Charged particles production in: • deep inelastic scattering (DIS); • photo-production. • Production of identified neutral particles. • Exclusive production: di-pion diffractive electro-production. • Conclusions. Particle production at ZEUS

  3. Particle production in high energy electron-proton scattering Most of the interactions (~90%) are the photo production Particle production at ZEUS

  4. Measurement of scaled momentum distributions xp as a test of QCD Particle production at ZEUS

  5. Particle production at ZEUS

  6. HERA Particle production at ZEUS

  7. I. Charged particle production in neutral current DIS Particle production at ZEUS

  8. I. Charged particle production in neutral current DIS DESY-09-229 The number of charged particles per event as a function of Q2 in xp bins The number of charged particles per event as a function of Q in xp bins Particle production at ZEUS

  9. I. Charged particle production in neutral current DIS DESY-09-229 NLO calculation LO calculation The number of charged particles per event as a function of Q2 in xp bins Particle production at ZEUS

  10. I. Charged particle production in neutral current DIS Particle production at ZEUS

  11. II. Scaled momentum distributions of charged particles for dijet photoproduction DESY-09-059 Particle production at ZEUS

  12. II. Scaled momentum distributions of charged particles for dijet photoproduction DESY-09-059 Particle production at ZEUS

  13. II. Scaled momentum distributions of charged particles for dijet photoproduction DESY-09-059 The ξ -distribution in five Ejet bins Λeff extracted at five Ejet points Particle production at ZEUS

  14. II. Scaled momentum distributions of charged particles for dijet photoproduction DESY-09-059 • The distributions are compared to predictions based on perturbative QCD carried out in the framework of the modified leading-logarithmic approximation (MLLA) and assuming local parton-hadron duality (LPHD) Particle production at ZEUS

  15. III. Scaled momentum distributions of identified particles, K0s and Λ ZEUS-prel-10-013 Scaled momentum distributions for K0s vs. Q2 in different regions of xp Scaled momentum distributions for Λ vs Q2 in different regions of xp Particle production at ZEUS

  16. III. Scaled momentum distributions of identified particles, K0s and Λ ZEUS-prel-10-013 Scaled momentum distributions for Λ vs. xp in different regions of Q2 Scaled momentum distributions for K0s vs. xp in different regions of Q2 Particle production at ZEUS

  17. IV. Dipion diffractive electro-production Data are good described by pion form factor Particle production at ZEUS

  18. IV. Dipion diffractive electro-production Good agreement between ZEUS (preliminary) results and PDG. Reasonable values of the relative amplitudes are obtained. Particle production at ZEUS

  19. IV. Dipion diffractive electro-production Particle production at ZEUS

  20. Conclusions • Charged particle spectra have been measured in DIS and photoproduction at HERA. In General results are found to support the concept of quark fragmentation universality. However, in detail, there exists some issues when comparing the data with theory. • Many new high statistics measurements of exclusive Vector Mesons at HERA. The measurements allow us to study the transition from the soft to hard regime. The perturbative QCD expectations in general are compatible with the data. The different models describe main features, but differ in some details. The measurements provide new insight into the proton structure with a high sensitivity to gluon density, skewing effects and GPDs. • The measured in LAB and the Breit frame production cross sections of neutral strange hadrons in general are in good agreement with predictions of two MC: MEPS and CDM when applying model parameters with lambda_s = 0.286 as used at LEP. Particle production at ZEUS

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