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C entral Ex clusive P roduction at H adron C olliders ( KRYSTHAL Collaboration )

C entral Ex clusive P roduction at H adron C olliders ( KRYSTHAL Collaboration ). V.A. Khoze ( IPPP, Durham and HIP& AFO, Helsinki ). (selected new results ). Introduction (why we are interested in CExP processes?) ‘ Diffractive Higgs’ revisited. Standard Candle CEP processes.

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C entral Ex clusive P roduction at H adron C olliders ( KRYSTHAL Collaboration )

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  1. Central Exclusive Production at Hadron Colliders (KRYSTHAL Collaboration) V.A. Khoze(IPPP, Durham and HIP& AFO, Helsinki) (selected new results )

  2. Introduction (why we are interested in CExP processes?) ‘Diffractive Higgs’ revisited. Standard Candle CEP processes. CEP as a way to study old and new heavy resonances. CEP through the KRYSTHAL eyes (new results, selected topics). Diphoton CEP. Dimeson CEP. SuperCHIC MC. Summary and Outlook. With a bit of personal flavour

  3. Forward Proton Taggers @ LHC as a gluonicAladdin’s Lamp • (Old and NewPhysics menu) • Higgs Hunting(the LHC ‘core business’) • Photon-Photon, Photon - HadronPhysics. • ‘Threshold Scan’:‘Light’ SUSY … • Various aspects of DiffractivePhysics (soft & hard ). • •High intensityGluon Factory(underrated gluons) (~20 mln quraks vs 417 ‘tagged’ g at LEP) • QCD test reactions, dijet P-luminosity monitor • Searches for new heavy gluophilic states • and many other goodies… • FPT • Would provide a unique additional tool to complement the conventionalstrategies at theLHCandILC. Higgs is only a part of the broad EW, BSM and diffractiveprogram@LHC wealth of QCD studies, glue-glue collider, photon-hadron, photon-photon interactions… (accounting for the LHCexclusion zones) BY POPULAR DEMAND (CDPE) ~ 10 *  (incl)

  4. 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 BSM param. spaceCEPmaybecome 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…) ‘Diffractive Higgs’ revisited H currently ATLAS FP-420 (STFC cutting rule) CMS-HPS, Totem 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 CEP will be particularly handy !

  5. 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. (B.Cox et al-06) enhanced trigger strategy & improved timing detectors (FP420, TDR) MSSM situation in the MSSM is very different from the SM PRIOR TO THE LHC START-UP SM-like > Conventionally due to overwhelming QCD backgrounds, the direct measurement of Hbb is hopeless The backgrounds to the diffractive H bb mode are manageable!

  6. PRIOR TO THE LHC START-UP

  7. 2012 results M.Tasevsky+ HKW Max –factor 5-10 enhancement.

  8. Marek Taševský DIS 2012, Bonn, Germany - 27/03 2012 New Ideas ?!

  9. CEP as a way to study old and new heavy resonances. Heavy Quarkonia Zoo of charmonium –like XYZ states

  10. Zoo of charmonium –like XYZ states

  11. still unconfirmed

  12. (maybe two different states X(3872), X(3875) ) Triggering on J/: M J/+, J/+ ….

  13. P-wave Bottomonia >30 years ago FNAL, E288 (spins- still unconfirmed) (Currently no complete theoretical description of onium properties.) (Still some puzzles) (BABAR (2008)) The heaviest and most compact quark-antiquark bound state in nature 15

  14. ATLAS-2011 (3P)

  15. CEP through the eyes of the KRYSTHAL (2008-2012) (or LRGs) CEP is reported by LHCb (DIS-11) new CDF CEP results (PRL-2012) Special Attention (CMS-2012-first studies) All measurements in agreement with Durham group (pre)dictions.

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

  17. Standard Candle Processes and light

  18. FSC@LHC (2007-2009) * (more coming soon ) * * Prpospects ! Our 3 measurements are all in good agreement (factor “few”) with the Durham group predictions.

  19. 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

  20. Now 43 events BEFORE ERIKet al (KMRS-04) (LKRS-10) (now proved to be very small (CDF) in agreement with our expectations)

  21. NLO effects-factor of 1.55 (HKRS in preparation) Currently theoret. uncertainties are under further revision.

  22. Factor of ~2 due to DD

  23. 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

  24. 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

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

  26. (A. Alekseev-1958-positronium) KMR-01 (R.Pasechnik et al, Phys.Lett.B680:62-71,2009; HKRS, Eur.Phys.J.C65:433-448,2010) …and especially without proton detectors! The effects of non-zero (especially for 2+ ).

  27. 1 : 0.6 : 0.22 2 First ‘exclusive’ events now being seen at LHCb. Results suggestive of a sizeable contribution.

  28. Prospects of Spin-parity Analyzer

  29. 40 diagrams (4 basic)  (M.Benayoun,V.Chernyak,-1990)

  30. (explicit calculation) is this easy to understand ?

  31. is this easy to understand ? currently popular (among the more formal community) MHV- technique

  32. Backgrounds for the diphoton CEP @ CMS ?

  33. (KRYSTHAL coll.- 08-12)

  34. (our new results will be available soon) (K-factor,..) New CDF data nicely confirm this !) (more work for Erik)

  35. (preliminary)

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