1  V.A. Khoze ( IPPP, Durham & PNPI ) (In collaboration with L. Harland-Lang, M. Ryskin and W.J. Stirling) Central Diffractive Processes at the Tevaron.

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Presentation transcript:

1  V.A. Khoze ( IPPP, Durham & PNPI ) (In collaboration with L. Harland-Lang, M. Ryskin and W.J. Stirling) Central Diffractive Processes at the Tevaron and LHC. CDP

Forward proton distributions and correlations. Tevatron, LHC and RHIC. with FSC

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

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

‘ Better to light a candle than to rant against darkness’ ( C onfucius ) Standard Candle Processes Standard Candle Processes

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

Our 3 measurements are all in good agreement (factor “few”) with the Durham group predictions. * * * Prpospects ! (more coming soon )

(Gap Detectors in no P-U events)

What we expect within the framework of the Perturbative Durham formalism ( KMR-01, KKMR-03, KMRS-04, HKRS-10) Example, O++ -case *K NLO 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-02, KKMR-03, HKRS KMR-01 Forward proton distributions& correlations- possibility to test diffraction dynamics KMR-02 (Gap size

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

(HKRS-09) Diphoton CEP

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

1 : 0.6 :

and accounted for in the integrand Spin-parity Analyzer

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

1 : 0.03 : 0.08

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

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

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

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

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

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

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

Thank You 

29 UNCERTAINTIES Known Unknowns Unknown 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… Gluons at so low scales, surprises are not excluded at all. Non- pQCD effects in the meson characteristics. Currently no complete description of heavy quarkonium characteristics. ‘ Two gluon width does not tell the whole story.’ Factor of 5 up or down (at best) Factor of 5 up or down (at best)

Are the early LHC runs, without proton taggers, able to check estimates for pp  p+A+p ? Possible checks of: (i) survival factor S 2 : W+gaps, Z+gaps (ii) generalised gluon f g :  p   p (iii) Sudakov factor T :  3 central jets (iv) soft-hard factorisation #(A+gap) evts (enhanced absorptive corr n ) #(inclusive A) evts with A = W, dijet,  … gap KMR: Divide et Impera