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

$: Factorization Breaking in Diffraction pp , g p and g *p$
Factorization Breaking in Diffraction pp, p and *p

Konstantin GoulianosThe Rockefeller University

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 2

Contents pp and pp results p and *p results discussion


pp and pp results


TSD (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)


Diffractive Structure Function

CDF

H1

momentum fractionof parton in Pomeron

Using preliminary pdf’s from

same suppressionas in soft diffraction

Xdijetppp

H1 2006 fits:more flat!factor ~10

suppression

pp vs. *p - Breakdown of QCD factorization


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 Structure Function:t- dependence

No diffraction dips No Q2 dependence in slope from inclusive to Q2~104 GeV2

Fit d/dt to a double exponential:

Same slope over entire region of 0 < Q2 < 4,500 GeV2

across soft and hard diffraction!


p and *p


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!


Unexpected, notunderstood

Hadron-like

QCD factorisationnot OK

Dijets in p at HERA - 2007[slide from summary of the HERA/LHC Workshop of March 14, 2007]


Dijets in p at HERA - 2008

DIS 2008 talk by W. Slomiński,

ZEUS

suppression of 20-50 % observed at low ET

expected in renormalization model


DISCUSSION


thank you

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

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