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(topical examples) With a bit of personal flavour Tevatron, RHIC and LHC. Forward proton distributions and correlations. CEP studies. CDP@LHC with FSC
New D0 jj- results, RHIC & ALICE data expected (star reactions!) Spin-Parity Analyzer (KKMR-2003) (glueballs- F.Close et al, Ochs-Minkowski) Detailed tests of dynamics of soft diffraction (KMR-02)
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 !
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:enhancedHbbrate (~ 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!
“soft” scattering can easily destroy the gaps S²absorption 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
Standard Candle Processes ‘Better to light a candle than to rant against darkness’ ( Confucius )
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.
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
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 11
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
Phys.Rev.Lett.102:242001,2009 Too good to be true ?!
(KRYSTHAL Col.) (HKRS-09,10)
(A. Alekseev-1958-positronium) KMR-01 (R.Pasechnik et al, Phys.Lett.B680:62-71,2009; HKRS, Eur.Phys.J.C65:433-448,2010)
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
KKMR-03 Very topical for STAR@RHIC forthcoming measurements with tagged forward protons KRYSTHAL coll. arXiv: 01011.0680
Can Central Diffraction be measured at the LHC (without proton taggers) ?
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)
, KK, , New STAR@RHIC results on CEP with tagged forward protons soon to come. Prospects of CDP studies at ALICE & LHCb
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 44
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
2. pp p+H+p SM MH=120 GeV LHC=14 TeV eikonal screening H Base value: s = 2.5 fb update -45% adjust c in upper limit 1 - kt/(cMH+kt) 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-0812.2413) +20% due to NLO unintegrated gluon (MRWatt-0909.5529) +20% connected with self-energy insertions in propagator of screening gluon(Ryskin et al.) see later PS Recall factor 3 uncertainty PPS Remember SUSY Higgs can be greatly enhanced