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BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K. Goulianos Tev4LHC 3-5 February 2005 Brookhaven National Laboratory.

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Presentation on theme: "BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K. Goulianos Tev4LHC 3-5 February 2005 Brookhaven National Laboratory."— Presentation transcript:

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2 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K. Goulianos Tev4LHC 3-5 February 2005 Brookhaven National Laboratory

3 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos2 What is Dark Energy? * * * H He E M * * * H He E M

4 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos3 Rapidity Gaps Gaps are exponentially suppressed From Poisson statistics: (  =particle density in rapidity space) Rapidity gaps are formed by multiplicity fluctuations. Non-diffractive interactions Bj, PRD 47 (1993) 101: regions of (pdeudo)rapidity devoid of particles Rapidity gaps at t=0 grow with  y. Diffractive interactions 2  : negative particle density!

5 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos4 CDF Run I results 93(2004)141601 http://physics.rockefeller.edu/dino/my.html

6 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos5 valence quarks antiproton x=x= Single Diffraction proton  g =0.20  q =0. 04  R =-0.5 g =0.5 q =0.3 SOFTHARD deep sea Derive diffractive from inclusive PDFs and color factors antiproton valence quarks p p

7 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos6 Inclusive Single Diffraction  Unitarity problem: Using factorization and std pomeron flux  SD exceeds  T at  Renormalization: normalize the Pomeron flux to unity KG, PLB 358 (1995) 379

8 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos7 A Scaling Law in Diffraction KG&JM, PRD 59 (1999) 114017 Factorization breaks down in favor of M 2 -scaling renormalization 1

9 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos8 Elastic and Total Cross Sections y  The exponential rise of  T (  y’) is due to the increase of wee partons with  y’ (see E. Levin, An Introduction to Pomerons,Preprint DESY 98-120) y  QCD expectations Total cross section: power law rise with energy Elastic cross section: forward scattering amplitude  s

10 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos9 Soft Diffraction 2 independent variables: gap probability Renormalization removes the s-dependence SCALING t color factor (KG, hep-ph/0205141) sub-energy x-section

11 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos10 The Factors  and  Experimentally: KG&JM, PRD 59 (114017) 1999 g =0.20 q =0.04 R =-0.5 f g =gluon fraction f q =quark fraction Color factor: Pomeron intercept: CTEQ5L

12 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos11 Multigap Diffraction Same suppression as for single gap! Gap probabilitySub-energy cross section (for regions with particles) 5 independent variables color factors (KG, hep-ph/0205141)

13 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos12 Central and Two-Gap CDF Results  One-gap cross sections are suppressed  Two-gap/one-gap ratios are Differential shapes agree with Regge predictions DDSDDDP E

14 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos13 Gap Survival Probability S = Results similar to predictions by: Gotsman-Levin-Maor Kaidalov-Khoze-Martin-Ryskin Soft color interactions

15 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos14 Diffractive DIS @ HERA e Q2Q2 ** p jet  reorganize Factorization holds: J. Collins e **  t p IP Pomeron exchangeColor reorganization

16 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos15 Inclusive vs Diffractive DIS  P (0)-1 (  q  )/2 F 2 ~ x  qq KG, “Diffraction: a New Approach,” J.Phys.G26:716-720,2000 e-Print Archive: hep-ph/0001092

17 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos16  diff /  incl DIS at HERA At fixed x: flat Q 2 -dependence At fixed Q 2 : flat x-dependence

18 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos17 Diffractive Dijets @ Tevatron p jet reorganize jet

19 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos18 F D JJ ( , Q 2 ) @ Tevatron

20 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos19 SD/ND Dijet Ratio vs x Bj @ CDF 0.035 <  < 0.095 Flat  dependence

21 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos20 Tevatron vs HERA: Factorization Breakdown dN/d  gap dN/d  gap pp IP CDF H1 pp IP e **  t p IP Predicted in KG, PLB 358 (1995) 379

22 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos21 New: F D JJ (  ) from ZEUS-LPS Data Fit including charm data Fit without charm data ZEUS H1 M. Arneodo, HERA/LHC workshop, CERN, 11-13 Oct 2004 Flat after subtracting Reggeon contribution

23 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos22 Restoring Factorization @ Tevatron R(SD/ND) R(DPE/SD) DSF from two/one gap: factorization restored!

24 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos23 CDF2LHC TOPICSTATUS  (Q 2, t) dependence of DSFclose to ready  Exclusive  c production close to ready  Low mass states in DPEneed good trigger  Exclusive b-bbar production in DPE need b-trigger   -dependence of DSFneed low lum run  Jet-gap-Jet w /jets in miniplugsneed low lum run

25 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos24 Diffraction @ LHC  Multigap diffraction  Exclusive production of high mass states

26 Tev4LHC @ BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos25 Summary @CDF Derive diffractive from ND pdf’s and color factors @ LHC Multigap and High Mass Exclusive Diffraction CDF2LHC Special low-lum run needed for low-  and JGJ

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