1 1  V.A. Khoze ( IPPP, Durham & PNPI ) (based on works by V.Khoze, M. RYskin and W.J. STirling and L. HArland-Lang ) Central Diffractive Production of Heavy Quarkonia. (KRYSTHAL collaboration) ; and arXiv:

2 Forward proton distributions and correlations. Tevatron, RHIC and LHC. with FSC (topical examples ) With a bit of personal flavour CEP studies.

3 (star reactions!) New D0 jj- results, RHIC & ALICE data expected Detailed tests of dynamics of soft diffraction (KMR-02) Spin-Parity Analyzer KKMR -2003)

4,b,b

5 Prospects for high accuracy (~1%) mass measurements (irrespectively of the decay mode). Quantum number filter/analyser. ( 0++ dominance ; C,P- even) H ->bb opens up ( Hbb- coupl. ) (gg) CED  bb in LO ; NLO,NNLO, b- mass effects - controllable. For some areas of the MSSM param. space CEDP may become a discovery channel ! H → WW */ WW - an added value ( less challenging experimentally + small bgds., better PU cond. ) New leverage –proton momentum correlations ( probes of QCD dynamics, CP- violation effects… )  LHC : ‘after discovery stage’, Higgs ID …… H How do we know what we’ve found? mass, spin, couplings to fermions and Gauge Bosons, invisible modes …  for all these purposes the CEDP will be particularly handy ! CED Higgs production at the LHC

6 MSSM without ‘clever hardware’: for H(SM)  bb at 60fb-1 only a handful of events due to severe exp. cuts and low efficiencies, though S/B~1. But H->WW mode at M>135 GeV.  enhanced trigger strategy & improved timing detectors. The backgrounds to the diffractive H bb mode are manageable! situation in the MSSM is very different from the SM Conventionally due to overwhelming QCD backgrounds, the direct measurement of Hbb is very difficult > SM-like 4 generations:  enhanced H  bb rate (~ 5 times ) Detailed HKRSTW studies

7 “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 recently : S² enh S²  absorption effects -necessitated by unitarity Everybody’s ~ happy (KMR, GLMM, FHSW, KP, S.Ostapchenco. Petrov et al, BH, GGPS, MCs..)

8 KMR-00(07) : use 2(3)-channel eikonal + ‘soft’ enhanced contributions Bartels,Bondarenko,Kutak,Motyka-06  used pert.thy.  corr n could be large and   H (excl) modified ? enhanced absorption, discussed first KKMR-01 in the diffractive dijet context “enhanced” correction to  H (excl)? Semi-enhanced hard rescattering and soft- hard factorization

9 (S. Ostapchenko- 2010) Welcome to the world of difficult physics!

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

11 All 3 measurements are all in good agreement (factor “few”) with the Durham group predictions. * * * Prpospects ! (more coming soon ) Tevatron observations: CDF and D0 each have a few exclusive JJ events > 100 GeV

12 CDF Collaboration, arXiv: [hep-ex], PRL KMRS -2004: 130 nb 80 nb (PDG-2008)  /KK mode as a spin-parity analyzer Prospects of  (b)-spectroscopy,

13 (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 P-wave Bottomonia

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15 Zoo of charmonium –like XYZ states

16 still unobserved

17 (maybe two different states X(3872), X(3875) )

18 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

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

20 (HKRS-09,10) (KRYSTHAL Col.)

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

22 1 : 0.6 :

23 Spin-parity Analyzer

24 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 %.

25 1 : 0.03 : 0.08

26 Very topical for forthcoming measurements with tagged forward protons KKMR-03 KRYSTHAL coll. arXiv:

27 KHRYSTHAL-2010

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37 Can Central Diffraction be measured at the LHC (without proton taggers) ? Towards the Full Acceptance Detector (bj- 1992)

38 ( Alice is installing counters )

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40 CMS NOTE-2010/015 Ask approval from CMS MB for Jan-Feb 2011 installation. Most value is 2011 running & when < ~ 5 (Do not expect to use > 2012)

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43 , KK,, New results on CEP with tagged forward protons soon to come. Prospects of CDP studies at ALICE & LHCb

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46 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 Factor of 5 up or down

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49 JINST-09

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51 2. pp  p+H+p Base value:  = 2.5 fb SM M H =120 GeV LHC=14 TeV eikonal screening update -45% adjust c in upper limit 1 - k t /(cM H +k t ) of z integration of Sudakov factor to reproduce one-loop result. Find c=1 (Coughlin, KMR09), and not 0.62 (KKMR04) -25% if enhanced screening included (KMR ) +20% due to NLO unintegrated gluon (MRWatt ) +20% connected with self-energy insertions in propagator of screening gluon (Ryskin et al.) PS Recall factor 3 uncertainty PPS Remember SUSY Higgs can be greatly enhanced H see later