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

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 3

pp and pp results

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 4

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)

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 5

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

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

LISHEP 2009, Brazil, Jan 19-24 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 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!

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 8

p and *p

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

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 10

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]

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 11

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

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 12

DISCUSSION

LISHEP 2009, Brazil, Jan 19-24 DIFFRACTIVE AND EXCLUSIVE PRODUCTION AT CDF II K. GOULIANOS 13

thank you