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

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Presentation transcript:

Factorization Breaking in Diffraction  pp,  p and  *p  Konstantin Goulianos The Rockefeller University

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 2 Contents  pp and pp results   p and  *p results  discussion

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 3 pp and pp results

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 4  T SD (pp & pp) - Soft Diffraction Factor of ~10 (~5) suppression observed at √s = 1800 (540) GeV Standard Regge Suppression relative to prediction from Regge factorization KG, PLB 358, 379 (1995)

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 5 Diffractive Structure Function CDF H1 momentum fraction of parton in Pomeron Using preliminary pdf’s from same suppression as in soft diffraction H fits: more flat! factor ~10 suppression pp vs.  *p - Breakdown of QCD factorization

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 6 Diffractive Structure Function: x Bj and Q 2 dependence E T jet ~ 100 GeV ! Small Q 2 dependence in region 100 < Q 2 < 10,000 GeV 2  Pomeron evolves as the proton!

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 7 Diffractive Structure Function: t- dependence  No diffraction dips  No Q2 dependence in slope from inclusive to Q 2 ~10 4 GeV 2 Fit d  /dt to a double exponential:  Same slope over entire region of 0 < Q 2 < 4,500 GeV 2 across soft and hard diffraction!

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 8  p and  *p

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 9 Vector meson production (Pierre Marage, HERA-LHC 2008)  left -suppression of % at high W  right -suppression of low |t| events at high Q 2  smaller slope!

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 10 Unexpected, not understood Hadron-like  QCD factorisation not OK Dijets in  p at HERA [slide from summary of the HERA/LHC Workshop of March 14, 2007]

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 11 Dijets in  p at HERA DIS 2008 talk by W. Slomiński, ZEUS  suppression of % observed at low ET  expected in renormalization model

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 12 DISCUSSION

LISHEP 2009, Brazil, Jan DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 13 thank you