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V.A. Khoze ( IPPP, Durham )

DIFFRACTION@LHC. 07 May 2010, CERN. 7 May 2010. Outlook on C entral D iffractive P rocesses at the Tevaron , LHC and RHIC. . V.A. Khoze ( IPPP, Durham ). (In collaboration with L. Harland-Lang, M. Ryskin and W.J. Stirling). CDP. Tevatron, LHC and RHIC.

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V.A. Khoze ( IPPP, Durham )

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  1. DIFFRACTION@LHC 07 May 2010, CERN 7 May 2010 Outlook onCentral Diffractive Processes at the Tevaron , LHCand RHIC  V.A. Khoze(IPPP, Durham) (In collaboration with L. Harland-Lang, M. Ryskin and W.J. Stirling) CDP

  2. Tevatron, LHC and RHIC. Forward proton distributions and correlations.

  3. D0, RHIC data to come soon (star reactions!) Spin-Parity Analyzer Detailed tests of dynamics of soft diffraction (KMR-02)

  4. “soft” scattering can easily destroy the gaps S²absorption effects -necessitated by unitarity gap M Everybody’s ~ happy (KMR, GLMM, FHSW, KP, Petrov et al, BH, GGPS, Luna...MCs) gap soft-hard factorizn conserved broken eikonal rescatt: between protons enhanced rescatt: involving intermediate partons Subject of hot discussions nowadays :S²enh

  5. Standard Candle Processes ‘Better to light a candle than to rant against darkness’ ( Confucius ) CDF & DO (Christina, Mike)

  6. FNAL, E288 (spins- still unconfirmed) (Currently no complete theoretical description of onium properties.) (Still puzzles) (BABAR (2008) The heaviest and most compact quark-antiquark bound state in nature

  7. (Christina, Mike) FSC@LHC (Mike) * (more coming soon ) * * Prpospects ! Our 3 measurements are all in good agreement (factor “few”) with the Durham group predictions.

  8. (Gap Detectors in no P-U events)

  9. What we expect within the framework of the Durham formalism (KMR-01, KKMR-03, KMRS-04, HKRS-10) Example, O++ -case *KNLO Strong sensitivity to the polarization structure of the vertex in the bare amplitude. Absorption is sizeably distorted by the polarization structure (affects the b-space distr.) KMR-01 KMR-02, KKMR-03 (Gap size Forward proton distributions & correlations- possibility to test diffraction dynamics KMR-02

  10. Phys.Rev.Lett.102:242001,2009 Too good to be true ?!

  11. (HKRS-09) Diphoton CEP

  12. (A. Alekseev-1958-positronium) KMR-01 (R.Pasechnik et al, Phys.Lett.B680:62-71,2009; HKRS, Eur.Phys.J.C65:433-448,2010)

  13. 1 : 0.6 : 0.22 2

  14. accounted for in the integrand and CDF Spin-parity Analyzer

  15. Central Diffractive Production of (Crystal Ball -1986) 3 % . (about 0.25 of all hadronic decays (CLEO-2009) FSC@LHCb ?  (Barbieri et al (1979), NRQCD ) Suppressed non-resonant background

  16. 1 : 0.03 : 0.08

  17. KKMR-03 Very topical for STAR@RHIC forthcoming measurements with tagged forward protons (HKRS results soon to come).

  18. 1+ 0+ 2+ 0-

  19. 0+ 1+ 0- 2+

  20. New (HKRS-2010) (Leading term QCD expectations) HKRS-results at different energies, and cuts are now available.

  21. Central production with RPs @STAR is taking of. First pppXp data. Partial wave analysis- soon.

  22. Rich diffractive structure of the cross sections as a function of proton momenta KMR-02 Ongoing HKRS studies forRHIC energies and kinematics. Correlations between transverse momenta of outgoing protons Interesting to compare the results for different states.

  23. Potentially rich program of CDP studies with the LHCb LHCb Excellent particle ID (pion/Kaon separation), vertex and proper time resolution exoticstates…. JINST 4:P11019,2009.

  24. (CDP background to the luminometer ) JINST 4:P11019,2009. Disclaimer : up to the experts to deliver a verdict

  25. , KK, , , dijet, diphton CEP- rich program of studies at the LHC; promising potential of LHCb. New STAR@RHIC results on CEP with tagged forward protons soon to come. Prospects of CDP studies at ALICE (Rainer) Currently active studies are in progress (both in theory and experiment).

  26. Thank You

  27. UNCERTAINTIES Known Unknowns N(N)LO- radiative effects (K-factors etc..) ‘…possible inadequancy of PT theory in s …’R.Barbieri et al-1980 ‘ ‘Right’ choice of gluon densities, in particular at so low scales as in the case ( potentiality of a factor of ~3 rise for the H-case ) . Complete model for calculation of enhanced absorption. -experimental widths, decays…     Unknown Unknowns Non- pQCD effects in the meson characteristics. Currently no complete description of heavy quarkonium characteristics. ‘Two gluon width does not tell the whole story.’   Gluons at so low scales, surprises are not excluded at all. Factor of 5 up or down (at best) 29

  28. )

  29. and

  30. DIPHOTON CEP MRST99 and MSTW08LO PDFs provide approximately upper and lower bounds respectively Ratios of cross sections at different energies- uncertainties

  31. Are the early LHC runs, without proton taggers, able to check estimates for pp  p+A+p ? gap gap KMR: 0802.0177 Possible checks of: (i) survival factor S2:W+gaps, Z+gaps (ii) generalised gluon fg :gp Up Divide et Impera (iii) Sudakov factor T :3 central jets (iv) soft-hard factorisation #(A+gap) evts (enhanced absorptive corrn)#(inclusive A) evts with A = W, dijet, U…

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