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1 Diffractive processes as a means to study new physics at the LHC VAK, ADM, WJS and G.W., visit. profs: A.De Roeck, A.Kaidalov, M.Ryskin + 6 young int.

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Presentation on theme: "1 Diffractive processes as a means to study new physics at the LHC VAK, ADM, WJS and G.W., visit. profs: A.De Roeck, A.Kaidalov, M.Ryskin + 6 young int."— Presentation transcript:

1 1 Diffractive processes as a means to study new physics at the LHC VAK, ADM, WJS and G.W., visit. profs: A.De Roeck, A.Kaidalov, M.Ryskin + 6 young int. scientists + FP-420 team membs Main aims:  the theoretical motivations behind the recent proposals to add the Forward Proton taggers to the LHC experiments.  the basic ingredients of Durham approach through the eyes of existing Tevatron and HERA diffractive data.  direct engagement with experimentalists in analysing and planning the forward measurements, in part., FP420 R&D. Theor. challenges : ● need for the elaborated and well tested models for soft diffraction. ● unusually & uncomfortably large higher-order QCD eff. (e. g. Sud. and non-Sud. Logs… ). ● no suitable conventional analytic or MC results readily available (colour singl., Jz=0).

2 2 Topics addressed so far (25 published papers) Higgs Hunting in the proton tagging mode. KKMRS Various aspects of Diffractive Physics (soft & hard ) at the LHC. KKMR ,05,06 High intensity Gluon Factory at hadron colliders. KMR -00,01,02 proton-proton luminometry at the LHC. KMOR-01 photon-photon, photon - hadron physics at the LHC. KMR-02 WBF mechanism of Higgs production with Rap. Gaps. DKMRO-02, KRSW-03 Studies of the QCD & EW backgrounds to the H-> bb, WW signals. DKMOR-02, KRS-05, CDKNPRST-05 Central Exclusive Diffractive Production as a CP-parity analyser. KKMR-03, KMR-04. ‘ Threshold Scan’ in the CEDP processes. KMR-02 Exotics in the CEDP processes (‘invis’. Higgs, extra dim…) KMR-02, BKMR-04 ‘ Standard candle’ processes at the Tevatron to test theor. predictions KKMRS Tests of models for diffraction at HERA. KKMR -01,03,06. Diffraction of nuclei at high energies KKMR-03  FP tagging would provide a unique additional tool to complement the conventional strategies at the LHC and ILC.

3 3 The main advantages of CED Higgs production Prospects for high accuracy 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.) New run of the MSSM studies is underway (with G. Weiglein et al) 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 !

4 4 EXPERIMENTAL CHECKS OF DURHAM APPROACH  Up to now the diffractive production data are consistent with KKMRS results Still more work to be done to constrain the uncertainties. Very low rate of CED high-Et dijets, yield of Central Inelastic dijets. ( CDF: Run I, Run II) data up to (E t)min >50 GeV. ‘ Factorization breaking’ between the effective diffractive structure functions measured at the Tevatron and HERA ( CDF ). The ratio of high Et dijets in production with one and two rapidity gaps ( CDF ). Preliminary CDF results on exclusive charmonium CEDP. Energy dependence of the Rap. Gap survival ( D0, CDF ) CDP of γγ Leading neutron spectra at HERA. BREAKING NEWS, CDF

5 5 S KMRS-05

6 6 Current projects and medium term ( ) plans  Comprehensive study of the radiative backgrounds to the H->bb CEDP, application to the Higgs physics at ( KRS )  Leading neutron spectra at HERA as a way to gauge the absorptive effects and enhanced Pomeron contributions ( KMR )  Detailed investigation of the MSSM Higgs sector in diffractive processes ( S. Heinemeyer, M. Tasevsky, G. Weiglein + KRS )  Prospects to study the NMSSM Higgs in diffractive processes ( A. De Roeck, J. Gunion + KMR )  Study of the NLL- effects in the mass-suppressed Jz=0 gg/  -> qq amplitudes ( A. Shuvaev + KMRS +… )

7 7 Exclusion region PRELIMINARY 5  Higgs discovery in a Forward Proton mode S.Heinemeyer, V.A. Khoze, M. Ryskin, W.J.Stirling, M. Tesevsky and G. Weiglein in progress

8 8 Longer-term ( ) plans.  Very Optimistic scenario: FP-420 is approved, and Higgs is found at the LHC.  the meticulous work on improving the accuracy of calculations to match the aimed for experimental precisions. An interplay with a ILC. + topics below.  FP420- unfriendly scenario : Higgs is found, but FP-420 is not approved or long delayed.  the application of the ‘event colour portrait’ technique ( VAK&WJS et al.) to disentangle the Higgs signal from the QCD bgds. Using the developed calc. technique for the ILC physics: + topics below.  ‘Pessimistic’ scenario: Elementary Higgs is not found and FP-420 is not approved. ● Comprehensive soft and semi-soft physics programs for TOTEM, CMS-TOTEM and ATLAS (possibly ALICE). Photon-induced interactions at the LHC. ● Top and stop studies revisited. ● Detailed (re) analysis of the Tevatron & HERA diffractive data for purely QCD purposes. ● QCD studies at ILC.

9 9 First opportunity –autumn 2008 (planned LHC shutdown)

10 10 The New UK R&D Bid FP420 is led by the UK. The physics case is led by Durham Close ties with Manchester and other UK FP 420’ ers. Successful annual IPPP-Manch. Forward wks (from 2001) Joint research and publications.


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