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The Future of Forward Physics at the LHC

Brian Cox, December 12th 2004. The Future of Forward Physics at the LHC. Welcome to The University of Manchester and Chancellors Conference Centre. Thanks to all at the IPPP, particularly Emma Worden, Valery Khoze and James Stirling for supporting the Manchester Christmas meeting again !.

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The Future of Forward Physics at the LHC

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  1. Brian Cox, December 12th 2004 The Future of Forward Physics at the LHC Welcome to The University of Manchester and Chancellors Conference Centre Thanks to all at the IPPP, particularly Emma Worden, Valery Khoze and James Stirling for supporting the Manchester Christmas meeting again ! Thanks to Sabah for computing services

  2. The phenomenology is moving fast, and getting more ‘experiment friendly’ 0++ Selection rule QCD Background ~ Standard Model Higgs b jets : MH = 120 GeV s = 2 fb (uncertainty factor ~ 2.5) MH = 140 GeV s = 0.7 fb MH = 120 GeV :11 signal / 3? background in 30 fb-1 H WW* : MH = 120 GeV s = 0.4 fb MH = 140 GeV s = 1 fb MH = 140 GeV :8 signal / 1? background in 30 fb-1 • The b jet channel is possible, with a good understanding of detectors and clever level 1 trigger • The WW* (ZZ*) channel is extremely promising : no trigger problems, better mass resolution at higher masses (even in leptonic / semi-leptonic channel) • If we see Higgs + tags - the quantum numbers are 0++

  3. The MSSM can be very proton-tagging friendly suppressed enhanced The intense coupling regime is where the masses of the 3 neutral Higgs bosons are close to each other and tan b is large 0++ selection rule suppresses A production: CEDP ‘filters out’ pseudoscalar production, leaving pure H sample for study MA = 130 GeV, tan b = 50 Mh = 124 GeV :71 signal / 3 background in 30 fb-1 MH = 135 GeV :124 signal / 2 background in 30 fb-1 MA = 130 GeV :3 signal / 2 background in 30 fb-1 Well known difficult region for conventional channels, tagged channel may well be the discovery channel, and is certainly a powerful spin/parity filter

  4. Probing CP violation in the Higgs Sector Azimuthal asymmetry in tagged protons provides direct evidence for CP violation in Higgs sector ‘CPX’ scenario s in fb CP odd active at non-zero t CP even Ongoing work - are there regions of MSSM parameter space where there are large CP violating couplings AND enhanced gluon couplings?

  5. How does the 420m program fit with the current 220m programs? • Contributes largely for asymmetric events - i.e. one P at 220m, one P at 420m • Increases acceptance by ~ 2 at 120 GeV • Will provide a trigger for difficult central systems Helsinki group

  6. Where we stand in the UK now (Manchester, Bristol, Brunel, IPPP, RAL, Glasgow, Cockroft institute) Design, fabrication, assembly and cold validation estimate 24 -30 months. There is a planned shutdown long enough for installation in autumn 2008. We will bid for a cryostat engineer to work on R&D with CERN - hope to start Oct 2005 • We have been asked to submit a detailed bid to PPRP early next year, with the caveat : • The FP420 consortium may not participate in the current 220m programs as part of this bid

  7. Some issues for this workshop • ATLAS, CMS or both? • The UK involvement will be as part of ATLAS and CMS UK • UK money will fund common R&D, but it is unlikely to fund both, and also difficulties may emerge with funding cryogenics • Non-UK collaborators? • We need 220m pots • How do we integrate with already existing (in 2008 /9) ATLAS and CMS 220m systems? • Theory has provided the motivation • There is a consensus, but this is not perceived by the outside world - we need to tie down any remaining issues before e.g. LHCC presentations

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