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Central Diffractive Production of Heavy Quarkonia (KRYSTHAL Collaboration)

This article discusses the prospects and challenges of studying central diffractive production of heavy quarkonia at the LHC. It explores topics such as forward proton distributions and correlations, spin-parity analysis, mass measurements, and Higgs production.

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Central Diffractive Production of Heavy Quarkonia (KRYSTHAL Collaboration)

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  1. Central Diffractive Production of Heavy Quarkonia. (KRYSTHAL collaboration)  V.A. Khoze(IPPP, Durham & PNPI) (based on works by V.Khoze, M. RYskin and W.J. STirling and L. HArland-Lang) and arXiv: 01011.0680 ; 1

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

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

  4. ,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 inLO ; NLO,NNLO, b- masseffects - controllable. • For some areas of the MSSM param. spaceCEDP may become adiscovery channel! • H→WW*/WW - an added value (less challenging experimentally + small bgds., better PUcond. ) • New leverage –proton momentum correlations (probes of QCD dynamics , CP- violation effects…) CED Higgs production at the LHC H How do we know what we’ve found?  LHC : ‘after discovery stage’,Higgs ID…… mass, spin, couplings to fermions and Gauge Bosons, invisible modes…  for all these purposes the CEDP will be particularly handy !

  6. 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->WWmode at M>135 GeV. enhanced trigger strategy & improved timing detectors. MSSM situation in the MSSM is very different from the SM SM-like > Detailed HKRSTW 2007-10 studies 4 generations:enhancedHbbrate (~ 5 times ) Conventionally due to overwhelming QCD backgrounds, the direct measurement of Hbb is very difficult The backgrounds to the diffractive H bb mode are manageable!

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

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

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

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

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

  12. CDF Collaboration, arXiv:0902.1271 [hep-ex], PRL KMRS -2004:130 nb 80 nb (PDG-2008) /KK mode as a spin-parity analyzer Prospects of (b)-spectroscopy , FSC@CMS

  13. P-wave Bottomonia 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 13

  14. 14

  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 *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, HKRS 09-10 (Gap size KMR-02 Forward proton distributions& correlations- possibility to test diffraction dynamics

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

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

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

  22. 1 : 0.6 : 0.22 2

  23. Spin-parity Analyzer

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

  25. 1 : 0.03 : 0.08

  26. KKMR-03 Very topical for STAR@RHIC forthcoming measurements with tagged forward protons KRYSTHAL coll. arXiv: 01011.0680

  27. KHRYSTHAL-2010

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

  29. ( Alice is installing counters )

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

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

  32. 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 46

  33. JINST-09

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