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18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 1 Highlights from Parallel Session B: Diffraction (Experimental Part) Frank-Peter Schilling.

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Presentation on theme: "18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 1 Highlights from Parallel Session B: Diffraction (Experimental Part) Frank-Peter Schilling."— Presentation transcript:

1 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 1 Highlights from Parallel Session B: Diffraction (Experimental Part) Frank-Peter Schilling / DESY (with Alessia Bruni, Markus Diehl) 12 th Workshop on Deep-Inelastic Scattering (DIS 2004) Strbske Pleso, Slovakia, April 2004

2 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 2 21 experimental talks … Diffraction at HERA Inclusive Diffraction / Leading Baryons Diffractive final states (jets, charm) Vector Meson Production and DVCS Vector Meson Production (HERA and RHIC) DVCS Diffraction at the TEVATRON Results from CDF and D0 The near and not-so-near Future of Diffraction The new H1 Very Forward Proton Spectrometer Forward Physics at the LHC (ATLAS, CMS, TOTEM)

3 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 3 Diffraction at HERA Inclusive Diffraction Diffractive Structure Function at low, medium and high Q2 (Kapishin, H1 and Ruspa, ZEUS) Observation of Diffractive Charged Current Events (Klimek, ZEUS) Leading Baryons: Pion Trajectory and DIS with leading protons (Sacchi, ZEUS) Diffractive Final States: Jets, Charm Jets in Diffractive DIS and Photoproduction (Schaetzel, H1 and Kagawa, ZEUS) D* production in diffraction and with leading neutron (Vlasov, ZEUS) Light-cone wave function of the photon (Ukleja, ZEUS)

4 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 4 Inclusive Diffractive DIS

5 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 5 Factorization in Diffraction

6 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 6 Inclusive Diffractive DIS Data Precise data using Rapidity Gap method Leading Proton Spectrometer (Roman Pot) data Precision HERA-I data …

7 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 7 Pomeron Intercept vs Q 2 Indications for rise with Q 2 ? … large systematics, in particular due to F L ignorance From fits to xpom or W dependence … Need to get better handle on F L D !

8 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 8 H1 NLO QCD interpretation of data Postive scaling violations to highest β … Diffractive NLO pdf’s with errors!

9 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 9 ZEUS NLO QCD fit to F 2 D and charm ZEUS NLO QCD fit to F 2 D and charm x IP <0.01, β<0.5 QCDNUM Regge factorisation assumption possible for this small data set DL flux initial scale Q 2 =2 GeV 2 zf(z)=(a 1 +a 2 z+a 3 z 2) (1-x) a4 Thorne-Robert variable-flavour- number-scheme Combined fit to LPS F 2 D And diffr. charm data … Gluon fraction ~82% Shape of pdf’s not well constrained

10 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 10 Comparison with Mx data Agreement within kinematic Range of LPS data N.B. p dissociation Correction 30%

11 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 11 Test QCD factorization in diffr. DIS: Jets New: NLO Calculations for dijets, charm in DIS using diffractive Pdf’s obtained from incl. data Good agreement with NLO calc. based on H1 pdf’s! Diffractive DIS jets P T >5(4) GeV Calculations based on DISENT

12 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 12 Test QCD Factorization in DIS: Charm Diffractive D* production, Calculations based on HVQDIS Diffr. DIS jets and charm: Consistent picture of diffractive DIS to NLO QCD!

13 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 13 Dijets in Diffractive Photoproduction Real photon (Q 2 ~0) can develop hadronic structure … Does factorization break down? (c.f. TEVATRON data) N.B. LO+PS comparisons, need NLO … Data show: No suppression of resolved w.r.t direct No suppression of photoprod w.r.t DIS

14 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 14 Observation of diffractive Charged Currrent events Q 2 >200 GeV 2, x IP <0.05 after diffractive selection, 9 events remain … Consistent with expectation …

15 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 15 Leading Baryon Production Important tool to understand P fragmentation / vertex factorization e+p->e+X+p/n Leading p: t dependence vs x L =Ep’/Ep Leading n: Triple Regge analysis to extract π trajectory Q 2 dependence wanted …

16 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 16 Vector Mesons and DVCS Vector Meson Production Phi production in DIS (Helbich, ZEUS) J/Psi production in DIS (low |t|) (Bruni, ZEUS) J/psi or photon production at high |t|, high W (Olsson, H1+ZEUS) Vector Meson Electroproduction at HERMES (Borissov, HERMES, see WG F summary) Vector Meson Photoproduction in Heavy Ion Collisions (Ogawa, STAR) DVCS New DVCS cross sections from HERA (Favart, H1) HERMES DVCS roadmap (Ellinghaus, HERMES, see WG F summary)

17 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 17 Exclusive Φ Production in DIS New Φ data: L=66 pb -1 4000 events VM production as clean laboratory to study soft-hard transition … W dependence getting steeper with Q 2 ? δ vs Q 2 +M 2 for ρ, Φ, J/Ψ α’ consistent with 0: pQCD? W dependence vs. t:

18 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 18 J/Ψ Production in DIS W dependence vs Q 2 Q 2 dependence of R=σ L /σ T : IP trajectory <> soft IP - Sensitive to (generalised) gluon - Need NLO before inclusion into global fits a’ smaller in DIS than photoprod.!

19 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 19 J/Ψ and Photon production at high |t| Looking for BFKL … BFKL LL+NL does good job (also W dep. vs t) a) J/ΨPsi at high |t|<30 GeV 2 b) Photon production at |t|<35 GeV LL BFKL reasonable (but only LL) (N.B. Similar conclusions from ZEUS J/Ψ for |t|<7)

20 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 20 Deeply Virtual Compton Scattering (DVCS) - Very clean process (no VM WF!) - Fully calculable in QCD - Sensitivity to GPD’s Major topic for HERA-II Dominant theor. Uncertainty: t-dep.! Need to measure (e.g. H1 VFPS)

21 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 21 Diffraction at the TEVATRON Diffraction at CDF (Terashi, CDF) Diffraction at D0 (Edwards, D0)

22 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 22 CDF Diffractive Structure Function Breakdown of factorization: Preductions based on HERA factor 10 too high! a) From single to non diffractive ratio: Confirmed with Run 2 data: New: No P T dependence observed! b) From double/single diffr. Ratio: Only small exta suppression going from 1 to 2 gaps!

23 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 23 Run-II exclusive dijets/Χ c Calibrating diffractive Higgs models for the LHC … Exclusive DPE Dijet production Consistent with Khoze, Martin, Ryskin model First look at X c production Need more data …

24 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 24 D0: New Forward Proton Detector Now both CDF and D0 have roman pots and are actively pursuing broad diffractive physics program Initial measurement of Elastic t slope: Many D0 Run-I diffractive results already using rapidity gap selection

25 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 25 Future Opportunities The new H1 Very Forward Proton Spectrometer (Janssen, H1) Forward and Diffractive Physics at the LHC (Boonekamp, ATLAS; Tasevsky, CMS; Deile, TOTEM)

26 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 26 New H1 Very Forward Proton Spectrometer New Roman Pots at 220m with large acceptance in diffractive regime: Installed in 2003 HERA shutdown First reconstructed tracks from elastic protons seen!

27 18/04/2004 Frank-Peter Schilling - DIS 2004 - Summary Session B 27 Conclusions Precise HERA and TEVATRON data available Consistent picture of inclusive diffractive DIS and DIS final states in terms of NLO diffr. Pdf’s HERA photoproduction vs TEVATRON? VM and DVCS to constrain gpd’s and map out soft-hard transition Future: Significant more HERA Run-2 (incl. H1 VFPS) and TEVATRON data Challenging forward detector+physics programs at LHC (ATLAS, CMS+TOTEM)

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