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Advances in Diffractive and Exclusive Production: EDS Blois Workshop Results

This workshop, held in Qui Nhon, Vietnam in December 2011, presented cutting-edge research on diffractive and exclusive production in high-energy particle collisions. Topics covered include diffractive W and Z production, rapidity gaps between jets, and the structure functions of diffractive processes, shedding light on the inner workings of quantum chromodynamics. Explore the new findings on exclusive gg production, the impact of quark content on diffractive exchange, and the suppression of gluon production. The data from CDF experiments reveal intriguing patterns in diffractive and exclusive events, providing crucial insights into the dynamics of particle interactions.

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Advances in Diffractive and Exclusive Production: EDS Blois Workshop Results

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  1. 14th Workshop on Elastic and Diffractive Scattering (EDS Blois Workshop) CDF RESULTS ON DIFFRACTION and EXCLUSIVE PRODUCTION Konstantin Goulianos Frontiers of QCD:  From Puzzles to Discoveries December 15-21, 2011, Qui Nhon, Vietnam

  2. CONTENTS • Diffractive W and Z production……………………..published • Diffractive structure function in dijetproduction ..…updated • Rapidity gaps between jets………….......................updated • __________________________________________________ • Diffr. structure function at low x using rap-gaps .….difficult ! • Diffr. structure function in DPE dijetproduction…. ..delayed • __________________________________________________ • Exclusive gg production in pp collisions at 1.96 TeV….NEW! - Diffractive & exclusive production in CDF

  3. Diffractive W/Z • InLOQCD W probes the quark content of diffractive exchange. • Production by gluons is suppressed by a factor of aSand distinguished by an associated jet. MW Diffractive & exclusive production in CDF

  4. MW from inclusive We/m+v Method: compare transverse MW data with MC MWdiff= 80.9± 0.7(GeV/c2) Diffractive & exclusive production in CDF

  5. Diffractive W/Z fractions ~80% 68-80% ~87% f1-int =(25.6±1.2)% RW (0.03 < x< 0.10, |t|<1)= [1.00 ± 0.05(stat.) ± 0.10(syst.)]% Run I: RW =1.15±0.55 % for xmin<x<0.1  [0.97±0.47 (stat. & syst.) % within 0.03 < x < 0.10 & |t|<1 RZ(0.03 < x< 0.10, |t|<1)= [0.88 ± 0.21(stat.) ± 0.08(syst.)]% Diffractive & exclusive production in CDF

  6. SD Rate (x ) jj Bj º R(x ) Þ Bj ND Rate (x ) jj Bj SD F (x ) jj Bj ND F (x ) jj Bj Diffractive Structure Function in Dijets Diffractive & exclusive production in CDF

  7. DSF: Q2 - dependence ETjet ~ 100 GeV ! • Small Q2 dependence in region 100<Q2<10 000 GeV2 • where dsSD/dET & dsND/dET vary by a factor of ~104 !  The Pomeron evolves as the proton ! Diffractive & exclusive production in CDF

  8. Dijet ET distributions similar for SD and ND over 4 orders of magnitude Kinematics Diffractive & exclusive production in CDF

  9. t – dependence: |t|<1 (GeV/c)^2 0.05 < x < 0.08 b1 b2 Fit ds/dt to a double exponential: • Same slope over entire region ~1 < Q2 < ~ 10 000 GeV2! • No diffraction dips • No Q2 dependence up to to Q2~104 GeV2 Diffractive & exclusive production in CDF

  10. |t| up to 4 (GeV/c)2 diffractive dip region?  must reevaluate errors! Diffractive & exclusive production in CDF

  11. Asymmetric t distributions: A tool for evaluating background level! t-distributions schematic view of fiber tracker 25 mm 2.5 mm 7.5 mm p p Y = 7.5 mm bgd = 2 evts/(GeV/c)2 12.5 mm Y 2 mm x • tracker’s upper edge: |t|=2.3 (GeV/c)^2, estimated from t~q^2 • the lower edge is at |t|= 6.5 (GeV/c)^2 (not shown) • background level: region of Ytrack>Yo data for |t|>2.3 (GeV/c)^2 Diffractive & exclusive production in CDF

  12. RPS acceptance vs. t and x Diffractive & exclusive production in CDF

  13. gaps between jets Diffractive & exclusive production in CDF

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