Presentation is loading. Please wait.

Presentation is loading. Please wait.

Aspects of Diffraction at the Tevatron

Published byHamdani Hermawan Modified over 5 years ago

Similar presentations

Presentation on theme: "Aspects of Diffraction at the Tevatron"— Presentation transcript:

1 Aspects of Diffraction at the Tevatron
Konstantin Goulianos The Rockefeller University & The CDF Collaboration CIPANP-2003, New York City, May 2003 Introduction Soft Diffraction Hard Diffraction Conclusion Selected reviews: hep-ex/ , hep-ex/ , hep-ph/ , hep-ph/ 19-24 May 2003 K. Goulianos, CIPANP-2003

2 What is hadronic diffraction?
Introduction What is hadronic diffraction? X Diffraction dissociation coherence KG, Phys. Rep. 101 (1983) 171 19-24 May 2003 K. Goulianos, CIPANP-2003

3 Diffraction and Rapidity Gaps
rapidity gaps are regions of rapidity devoid of particles Non-diffractive interactions: Diffractive interactions: rapidity gaps are formed by multiplicity fluctuations rapidity gaps, like diamonds, ‘live for ever’ From Poisson statistics: (r=particle density in rapidity space) Gaps are exponentially suppressed large rapidity gaps are signatures for diffraction 19-24 May 2003 K. Goulianos, CIPANP-2003

4 The Pomeron ? POMERON CONFINEMENT
Quark/gluon exchange across a rapidity gap: POMERON No particles radiated in the gap: the exchange is COLOR-SINGLET with quantum numbers of vacuum Rapidity gap formation: NON-PERTURBATIVE Diffraction probes the large distance aspects of QCD: POMERON CONFINEMENT ? PARTONIC STRUCTURE FACTORIZATION 19-24 May 2003 K. Goulianos, CIPANP-2003

5 Diffraction at CDF in Run I
Elastic scattering Total cross section Diffraction PRD 50 (1994) 5518 PRD 50 (1994) 5550 SOFT diffraction Control sample PRD PRL PRL PRL 50 (1994) (2001) to be sub’d submitted HARD diffraction PRL reference with roman pots W (1997) 2698 JJ (1995) 855 JJ (2000) 4217 JJ (1997) 2636 JJ (1998) 1156 b-quark 84 (2000) 232 JJ (1998) 5278 J/y (2001) JJ (2000) 5043 JJ (2002) 19-24 May 2003 K. Goulianos, CIPANP-2003

6 Diffraction at D0 in Run I
Hard diffraction PLB 531(2002)52 PRL 72(1994)2332 Conference report W-conf. report PRL 76(1996)734 PRB 440(1998)189 19-24 May 2003 K. Goulianos, CIPANP-2003

7 Factorization & Renormalization
Soft diffraction parton model Factorization & Renormalization f Pomeron trajectory COLOR FACTOR Renormalize to unity KG, PLB 358(1995)379 Gap probability 19-24 May 2003 K. Goulianos, CIPANP-2003

8 Soft Single Diffraction (CDF-I)
Total cross section KG, PLB 358 (1995) 379 Differential cross section KG&JM, PRD 59 (114017) 1999 REGGE RENORM s-independent Differential shape agrees with Regge Normalization is suppressed by factor Renormalize Pomeron flux factor to unity M2 SCALING 19-24 May 2003 K. Goulianos, CIPANP-2003

9 Central and Double Gaps (CDF-I)
Double Diffraction Measure #Events versus Dh Double Pomeron Exchange Measure Plot #Events versus log(x) SDD: single+double diffraction Central gaps in SD events 19-24 May 2003 K. Goulianos, CIPANP-2003

10 Central and Double-gap Results (CDF)
Differential shapes agree with Regge predictions DD SDD DPE One-gap cross sections require renormalization Two-gap/one-gap ratios are 19-24 May 2003 K. Goulianos, CIPANP-2003

11 Two-gap Diffraction (hep-ph/0205141)
7 independent variables color factor Gap probability Sub-energy cross section (for regions with particles) Integral Renormalization removes the s-dependence SCALING 19-24 May 2003 K. Goulianos, CIPANP-2003

12 Hard diffraction (Run I)
Tag rapidity gaps Tag antiproton BBC <h<5.9 FCAL 2.4<h<4.2 BBC FCAL Diffractive dijets 19-24 May 2003 K. Goulianos, CIPANP-2003

13 Hard Diffraction Using Rapidity Gaps
SINGLE DIFFRACTION DOUBLE DIFFRACTION SD/ND gap fraction (%) at 1800 GeV DD/ND gap fraction at 1800 GeV X CDF D0 W 1.15 (0.55) JJ 0.75 (0.10) 0.65 (0.04) b 0.62 (0.25) J/y 1.45 (0.25) All SD/ND fractions ~1% Gluon fraction Suppression by ~5 relative to HERA Just like ND except for the suppression due to gap formation 19-24 May 2003 K. Goulianos, CIPANP-2003

14 Diffractic Dijets with Leading (CDF)
(not detected) Bjorken-x of antiproton Nucleon structure function Diffractive structure function ISSUES: 1) QCD factorization > is FSD universal? 2) Regge factorization > ? momentum fraction of parton in IP METHOD of measuring FSD : measure ratio R(x,t) of SD/ND rates for given x,t set R(x,t)=FSD/FND evaluate FSD = R * FND 19-24 May 2003 K. Goulianos, CIPANP-2003

15 Dijets in Single Diffraction (CDF-I)
Test QCD factorization Test Regge factorization Suppressed at the Tevatron relative to predictions based on HERA parton densities Regge factorization holds !!! 19-24 May 2003 K. Goulianos, CIPANP-2003

16 Dijets in Double Pomeron Exchange (CDF-I)
Test of factorization (not detected) R(SD/ND) equal? R(DPE/SD) Factorization breaks down The second gap is un-suppressed!!! 19-24 May 2003 K. Goulianos, CIPANP-2003

17 Run II Diffraction at the Tevatron
CDF and D0 Forward Detectors MiniPlug calorimeters (3.5<h<5.5) Beam Shower Counters (5.5<h<7.5) Antiproton Roman Pot Spectrometer Roman Pot Spectrometers on proton & antiproton sides 19-24 May 2003 K. Goulianos, CIPANP-2003

18 Run II Data Samples (CDF)
Triggers J5 At least one cal tower with ET > 5 GeV RP inclusive Three-fold coincidence in RP trigger counters RP+J5 Single Diffractive dijet candidates RP+J5+BSC-GAP_p Double Pomeron Exchange dijet candidates Results presented are from ~26 pb-1 of data The Roman Pot tracking system was not operational for these data samples The x of the (anti)proton was determined from calorimeter information: (-)+ is for (anti)proton 19-24 May 2003 K. Goulianos, CIPANP-2003

19 Run II Dijets in Single Diffraction (CDF)
R=(SD/Dx)/ND Agreement with Run I No Q2 dependence ND+SD & SD+MB overlap events x ~ 1 SD events 0.03<x<0.1 Flat region 19-24 May 2003 K. Goulianos, CIPANP-2003

20 Run II Dijets in DPE (CDF)
Exclusive dijets? 19-24 May 2003 K. Goulianos, CIPANP-2003

21 Inclusive/Exclusive DPE Dijet Predictions
19-24 May 2003 K. Goulianos, CIPANP-2003

22 Run II: Exclusive DPE Dijets ?
No exclusive dijet bump observed Generous upper limit on exclusive dijets 19-24 May 2003 K. Goulianos, CIPANP-2003

23 Double Pomeron Exchange Dijet Events
Rjj=0.81, Jet1(2)=33.4(31.5) GeV Rjj=0.36, Jet1(2)=36.2(33.3) GeV 19-24 May 2003 K. Goulianos, CIPANP-2003

24 Soft and hard conclusions
SUMMARY Soft and hard conclusions 1) Differential shapes agree with factorization based Regge predictions 2) Single-gap production rates are suppressed as the energy increases 3) Renormalizing the gap probability to unity yields correct rates 4) Two-gap to one-gap ratios are ~ equal to Same general features as in soft diffraction SOFT COLOR FACTOR HARD 19-24 May 2003 K. Goulianos, CIPANP-2003

Download ppt "Aspects of Diffraction at the Tevatron"

Similar presentations

29.6.2005Low x meeting, Sinai 20051 Alice Valkárová on behalf of H1 collaboration LOW x meeting 2005, Sinaia H1 measurements of the structure of diffraction.

Low x meeting, Sinai Alice Valkárová on behalf of H1 collaboration LOW x meeting 2005, Sinaia H1 measurements of the structure of diffraction.
CERN 26-27 March 2004HERA and the LHC: Diffractive Gap Probability K. Goulianos1 HERA and the LHC K. Goulianos, The Rockefeller University CERN 26-27 March.

CERN March 2004HERA and the LHC: Diffractive Gap Probability K. Goulianos1 HERA and the LHC K. Goulianos, The Rockefeller University CERN March.
DIFFRACTION NEWS FROM CDF Konstantin Goulianos The Rockefeller University Otranto (Lecce), Italy.

DIFFRACTION NEWS FROM CDF Konstantin Goulianos The Rockefeller University Otranto (Lecce), Italy.
Brazil 31 Mar – 2 Apr 2004 Diffraction: from HERA & Tevatron to LHC K. Goulianos1 Diffraction: from HERA & Tevatron to LHC K. Goulianos, The Rockefeller.

Brazil 31 Mar – 2 Apr 2004 Diffraction: from HERA & Tevatron to LHC K. Goulianos1 Diffraction: from HERA & Tevatron to LHC K. Goulianos, The Rockefeller.
K. Goulianos The Rockefeller University EDS 2005 15-20 May 2005 Chateau de Blois, France Twenty Years of Diffraction at the Tevatron

K. Goulianos The Rockefeller University EDS May 2005 Chateau de Blois, France Twenty Years of Diffraction at the Tevatron
Diffractive x-sections and event final states at the LHC Konstantin Goulianos The Rockefeller University / Diffraction Day.

Diffractive x-sections and event final states at the LHC Konstantin Goulianos The Rockefeller University / Diffraction Day.
High Energy Physics Seminar University of Connecticut 7 February 2005 Konstantin Goulianos The Rockefeller University QCD ASPECTS OF HADRONIC DIFFRACTION.

High Energy Physics Seminar University of Connecticut 7 February 2005 Konstantin Goulianos The Rockefeller University QCD ASPECTS OF HADRONIC DIFFRACTION.
K. Goulianos The Rockefeller University Diffractive and Total Cross Tevatron and LHC HCP 2006 Duke University, NC, USA, 22-26 May 2006  CDF.

K. Goulianos The Rockefeller University Diffractive and Total Cross Tevatron and LHC HCP 2006 Duke University, NC, USA, May 2006  CDF.
K. Goulianos The Rockefeller University Pomeron Intercept and Slope: are they related? Small-x and Diffraction, FERMILAB, 27-31 March 2007 intercept slope.

K. Goulianos The Rockefeller University Pomeron Intercept and Slope: are they related? Small-x and Diffraction, FERMILAB, March 2007 intercept slope.
Manchester 14-16 Dec 2003 Diffraction from HERA and Tevatron to LHCK. Goulianos1 Konstantin Goulianos The Rockefeller University Workshop on physics with.

Manchester Dec 2003 Diffraction from HERA and Tevatron to LHCK. Goulianos1 Konstantin Goulianos The Rockefeller University Workshop on physics with.
1 Inclusive Double-Pomeron Exchange at the Fermilab Collider Authors : M.E. Convery, K. Goulianos, K. Hatakeyama The Rockefeller University Godparents.

1 Inclusive Double-Pomeron Exchange at the Fermilab Collider Authors : M.E. Convery, K. Goulianos, K. Hatakeyama The Rockefeller University Godparents.
The Rockefeller University and the CDF Collaboration

The Rockefeller University and the CDF Collaboration
19-24 May 2003K. Goulianos, CIPANP-20031 Konstantin Goulianos The Rockefeller University & The CDF Collaboration CIPANP-2003, New York City, 19-24 May.

19-24 May 2003K. Goulianos, CIPANP Konstantin Goulianos The Rockefeller University & The CDF Collaboration CIPANP-2003, New York City, May.
DIFFRACTION RESULTS FROM CDF XIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011) April 11-15, 2011 Newport News, VA.

DIFFRACTION RESULTS FROM CDF XIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011) April 11-15, 2011 Newport News, VA.
Manchester 11-13 Dec 20051 Dynamic Alignment of Roman Pots Konstantin Goulianos The Rockefeller University The Future of Forward Physics at the LHC Manchester,

Manchester Dec Dynamic Alignment of Roman Pots Konstantin Goulianos The Rockefeller University The Future of Forward Physics at the LHC Manchester,
Low x 2008, Kolymbari-Crete, GreeceDiffractive and Exclusive JJ and W/Z at CDF K. Goulianos1 Diffractive and Exclusive Production of Dijets and W/Z at.

Low x 2008, Kolymbari-Crete, GreeceDiffractive and Exclusive JJ and W/Z at CDF K. Goulianos1 Diffractive and Exclusive Production of Dijets and W/Z at.
BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K. Goulianos Tev4LHC 3-5 February 2005 Brookhaven National Laboratory.

BNL 3-5 Feb 2005Diffraction from CDF2LHC K. Goulianos1 Diffraction from CDF2LHC K. Goulianos Tev4LHC 3-5 February 2005 Brookhaven National Laboratory.
September 17-20, 2003.Kenichi Hatakeyama1 Soft Double Pomeron Exchange in CDF Run I Kenichi Hatakeyama The Rockefeller University for the CDF Collaboration.

September 17-20, 2003.Kenichi Hatakeyama1 Soft Double Pomeron Exchange in CDF Run I Kenichi Hatakeyama The Rockefeller University for the CDF Collaboration.
CDF The Future of QCD at the Tevatron Fermilab, 20-22 May 2004 Konstantin Goulianos The Rockefeller University.

CDF The Future of QCD at the Tevatron Fermilab, May 2004 Konstantin Goulianos The Rockefeller University.
ISMD 2004 26 July – 1 August 2004 Sonoma County, California, USA DIFFRACTION FROM THE DEEP SEA Konstantin Goulianos The Rockefeller University.

ISMD July – 1 August 2004 Sonoma County, California, USA DIFFRACTION FROM THE DEEP SEA Konstantin Goulianos The Rockefeller University.

Similar presentations

Ads by Google