forward proton distributions and correlations
DESCRIPTION
(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). - PowerPoint PPT PresentationTRANSCRIPT
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Forward proton distributions and correlations.
Tevatron, RHIC and LHC.
CDP@LHC with FSC
(topical examples)
With a bit of personal flavour
CEP studies.
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(star reactions!)
New D0 jj- results,RHIC & ALICE data
expected
Detailed tests of dynamics of soft diffraction (KMR-02)
Spin-Parity Analyzer (KKMR-2003) (glueballs- F.Close et al, Ochs-Minkowski)
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,b
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• 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
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MSSM
without ‘clever hardware’: for H(SM)bb at 60fb-1 onlya handful of events due tosevere 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 Hbb rate (~ 5 times )
Detailed HKRSTW 2007-10 studies
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“soft” scattering can easily destroy the gaps
gap
gap
eikonal rescatt: between protonsenhanced rescatt: involving intermediate partons
M
soft-hardfactorizn
conservedbroken
Subject of hot discussions recently :Subject of hot discussions recently : S²S²enhenh
S² absorption effects -necessitated by unitarity
Everybody’s ~ happy (KMR, GLMM, FHSW, KP, S.Ostapchenco. Petrov et al, BH, GGPS, MCs..)
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‘Better to light a candle than to rant against darkness’
( Confucius )
Standard Candle ProcessesStandard Candle Processes
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All 3 measurements are all in good agreement (factor “few”) with the Durham group predictions.
*
*
*Prpospects !
FSC@LHC
(more coming soon )
Tevatron observations: CDF and D0 each have a few exclusive JJ events > 100 GeV
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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
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1111
(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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Zoo of charmonium –like XYZ states
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still unobserved
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(maybe two different states X(3872), X(3875) )
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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-02, KKMR-03,HKRS 09-10
KMR-01
Forward proton distributions& correlations- possibility to test diffraction dynamics
KMR-02(Gap size
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Too good to be true ?!
Phys.Rev.Lett.102:242001,2009
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(HKRS-09,10) (KRYSTHAL Col.)
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(A. Alekseev-1958-positronium)
(R.Pasechnik et al, Phys.Lett.B680:62-71,2009; HKRS, Eur.Phys.J.C65:433-448,2010)
KMR-01
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1 : 0.6 : 0.22
2
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21Spin-parity Analyzer
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Central Diffractive Production of
(Crystal Bal -1986)
(about 0.25 of all hadronic decays (CLEO-2009)
(Barbieri et al (1979), NRQCD )FSC@LHCb ?
Suppressed non-resonant background
3 % .
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1 : 0.03 : 0.08
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(0 ) /d d
Very topical for STAR@RHIC forthcoming measurements with tagged forward protons
KKMR-03
KRYSTHAL coll. arXiv: 01011.0680
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KHRYSTHAL-2010
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Can Central Diffraction be measured at the LHC (without proton taggers) ?
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( Alice is installing counters )
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CMS NOTE-2010/015
Ask approval from CMS MBfor Jan-Feb 2011 installation.
Most value is 2011 running& when <n/x> < ~ 5(Do not expect to use > 2012)
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, KK, ,
New STAR@RHIC results on CEP with tagged forward protons soon to come.
Prospects of CDP studies at ALICE & LHCb
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UNCERTAINTIES 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.
c
b
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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JINST-09
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KMR-00(07): use 2(3)-channel eikonal+ ‘soft’ enhanced contributions
Bartels,Bondarenko,Kutak,Motyka-06
used pert.thy.corrn could be large and H(excl) modified ?
enhanced absorption,discussed first KKMR-01
in the diffractive dijet context
“enhanced”correctionto H(excl)?
Semi-enhanced hard rescattering and soft-hard factorization
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2. pp p+H+pBase value: = 2.5 fb
SM MH=120 GeVLHC=14 TeVeikonal screening
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.)
PS Recall factor 3 uncertaintyPPS Remember SUSY Higgs can be greatly enhanced
H
see later