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Factorization Breaking in Diffraction  pp , g p and g *p 

Factorization Breaking in Diffraction  pp , g p and g *p . Konstantin Goulianos The Rockefeller University. Contents. pp and pp results g p and g *p results discussion. pp and pp results. s T SD (pp & pp) - Soft Diffraction.

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Factorization Breaking in Diffraction  pp , g p and g *p 

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  1. Factorization Breaking in Diffraction  pp, gp and g*p Konstantin Goulianos The Rockefeller University

  2. Contents • pp and pp results • gp and g*p results • discussion DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  3. pp and pp results DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  4. sTSD (pp & pp) - Soft Diffraction Suppression relative to prediction from Regge factorization Standard Regge Factor of ~10 (~5) suppression observed at √s = 1800 (540) GeV KG, PLB 358, 379 (1995) DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  5. pp vs. g*p - Breakdown of QCD factorization Diffractive Structure Function same suppression as in soft diffraction H1 H1 2006 fits: more flat! CDF factor ~10 suppression Using preliminary pdf’s from momentum fraction of parton in Pomeron DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  6. Diffractive Structure Function:xBj and Q2 dependence ETjet ~ 100 GeV ! • Small Q2 dependence in region 100 < Q2 < 10,000 GeV2 • Pomeron evolves as the proton! DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  7. Diffractive Structure Function:t- dependence Fit ds/dt to a double exponential: • Same slope over entire region of 0 < Q2 < 4,500 GeV2 across soft and hard diffraction! • No diffraction dips • No Q2 dependence in slope from inclusive to Q2~104 GeV2 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  8. gp and g*p DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  9. Vector meson production (Pierre Marage, HERA-LHC 2008) • left -suppression of 20-50 % at high W • right -suppression of low |t| events at high Q2smaller slope! DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  10. Dijets in gp at HERA - 2007 [slide from summary of the HERA/LHC Workshop of March 14, 2007] Hadron-like g QCD factorisation not OK Unexpected, not understood DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  11. Dijets in gp at HERA - 2008 DIS 2008 talkby W.Slomiński, ZEUS • suppression of 20-50 % observed at low ET • expected in renormalization model DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  12. DISCUSSION QUESTIONS? DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

  13. thank you thank you DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF IIK. GOULIANOS

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