1

2

Forward proton distributions and correlations.

Tevatron, RHIC and LHC.

CDP@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) (glueballs- F.Close et al, Ochs-Minkowski)

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 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 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

7

“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..)

8

‘Better to light a candle than to rant against darkness’

( Confucius )

Standard Candle ProcessesStandard Candle Processes

9

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

10

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

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

1212

13

Zoo of charmonium –like XYZ states

14

still unobserved

15

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

16

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

17

Too good to be true ?!

Phys.Rev.Lett.102:242001,2009

18

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

19

(A. Alekseev-1958-positronium)

(R.Pasechnik et al, Phys.Lett.B680:62-71,2009; HKRS, Eur.Phys.J.C65:433-448,2010)

KMR-01

20

1 : 0.6 : 0.22

2

21Spin-parity Analyzer

22

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 % .

23

1 : 0.03 : 0.08

24

(0 ) /d d

Very topical for STAR@RHIC forthcoming measurements with tagged forward protons

KKMR-03

KRYSTHAL coll. arXiv: 01011.0680

25

KHRYSTHAL-2010

26

27

28

29

30

31

32

33

34

35

Can Central Diffraction be measured at the LHC (without proton taggers) ?

36

( Alice is installing counters )

37

38

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)

39

40

41

, KK, ,

New STAR@RHIC results on CEP with tagged forward protons soon to come.

Prospects of CDP studies at ALICE & LHCb

42

43

4444

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

45

46

47

JINST-09

48

49

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

50

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