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