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LCWS 05

LCWS 05. LHC a ILC Top Higgs Polarizace. The TeV I L C planned for 2015. Parameters defined by ILCSC scope-panel for ITRP http://www.fnal.gov/directorate/icfa/LC_parameters.pdf Baseline s = 200-500 GeV, integrated l uminosity   = 500 fb -1 over 1 st 4 years

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LCWS 05

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  1. LCWS 05 LHC a ILC Top Higgs Polarizace J. Cvach, LCWS05

  2. The TeV ILCplanned for 2015 • Parametersdefined by ILCSC scope-panel for ITRP http://www.fnal.gov/directorate/icfa/LC_parameters.pdf • Baseline s = 200-500 GeV, • integrated luminosity  = 500 fb-1 over 1st 4 years • 80% electron polarisation • 2 interaction regions with easy switching • Upgrade Anticipate s  1 TeV,  = 1 ab-1 over 4 years • Options e-e- collisions, • 50% positron polarisation, • “GigaZ”; high  at Z and at WW threshold, • Laser backscatter for  and e collisions, • Doubled  at 500 GeV. • Choice among options to be guided by physics needs. J. Cvach, LCWS05

  3. LHC:pp scattering at 14 TeV Scattering process of proton constituents with energy up to several TeV, strongly interacting  huge QCD backgrounds, low signal-to-background ratios ILC: e+e-scattering at ≈ 0.5-1 TeV Clean experimental environment: well-defined initial state, tuneable energy, beam polarization, GigaZ γγ, γe-, e-e- options, . . .  relatively small backgrounds high-precision physics Physics at the LHC and ILC in a nutshell J. Cvach, LCWS05

  4. Recent illustration; D0’s new mt measurement 2001; mt=174.3 5.1; PDG 2004;mt=178.0 4.3 Moves best fit mH by > 20 GeV. Very sensitive. Definite job to be done.Measure mt to <  100 MeV Because precision on mtlimits current SM fit. Why? J. Cvach, LCWS05

  5. What precise mt would do for MSSM (Heinemeyer et al) J. Cvach, LCWS05

  6. Flavour changing NC processes J. Cvach, LCWS05

  7. High precision top mass J. Cvach, LCWS05

  8. Higgs na ILC Hlavní mechanismy pro produkci Higgse : a) Higgs strahlung (dominuje pro malé MH) b) W fusion (dominuje pro velké MH) J. Cvach, LCWS05

  9. Higgs mass measurement 500 fb-1 at 350 GeV Constrained fits to final states J. Cvach, LCWS05

  10. Precision on Higgs branching ratios TESLA TDR J. Cvach, LCWS05

  11. The Recoil Measurement Higgs mass and cross section in e+e-  Z X  e+e- X (μ+μ- X) • Study of SM Higgs sensitivity at ILC - full simulation (MOKKA)! • work in progress The Invariant Mass of Invisible System (the Recoil Mass Method) Including the ISR Particle Flow inReconstruction SM Higgs Signal Reconstruction Z μ+ μ- Final State 100 fb-1 SM Higgs Signal Reconstruction Z  e+e- Final State 100 fb-1 Event display: h0 Z0 b bbar μ+ μ- J. Cvach, LCWS05

  12. ILC Charge in Higgs Physics At the ILC,we can do an inclusive measurement of Higgs production: e+e- H + X (recoil spectrum) This removes the model dependence from all LHC (and ILC) coupling measurements. • At the ILC, we can determine couplings to better than 5 %. In particular, can be precisely measured. Leaving the minimal SM paradigm, there is another crucial point: • At the ILC, we can detect extra scalars in the Higgs sector (if not too heavy), complementing LHC searches. Many of their properties can be determined. Finally: • At the ILC, the Higgs self-coupling can be measured (with low precision), if the Higgs is not too heavy. (For a Higgs boson above the WW threshold, this is more accessible at the LHC.) J. Cvach, LCWS05

  13. "Known unknowns" vs. "unknown unknowns" ILC will be prepared to explore Higgs physics, SUSY, extra dimensions, mini black holes, . . . These are „known unknowns“, but one also needs to be prepared for the unexpected LHC: interaction rate of 109 events/s  can trigger on only 1 event in 107 ILC: untriggered operation  can find signals of unexpected new physics (direct production + large indirect reach) that manifests itself in events that are not selected by the LHC trigger strategies J. Cvach, LCWS05

  14. Práce skupiny LHC/ILC: hep-ph/0410364 The intimate interplay of the results of the two collider facilities will allow one to probe, much more effectively and more conclusively than each machine separately, the fundamental interactions of nature and the structure of matter, space and time. Results from both colliders will be crucial in order to decipher the underlying physics in the new territory that lies ahead of us and to draw the correct conclusions about its nature. This information will be decisive for guiding the way towards effective experimental strategies and dedicated searches. It will not only sharpen the goals for a subsequent phase of running of both LHC and LC, but will also be crucial for the future roadmap of particle physics. The interplay between LHC and LC is a very rich field, of which only very little has been explored so far. J. Cvach, LCWS05

  15. Positron (polarised) source • Both beams polarized • Different production mechanisms in s, t channels • In case of MSSM – charge of observed lepton directly related to L, R quantum no. of the selectron • e-L,R ẽ-L,R and e+L,R ẽ+L,R • Smaller background to physical processes • Large amount of charge to produce • Three concepts: • undulator-based (TESLA TDR baseline) • ‘conventional’ (extrapolation from SLC e+ source) • laser Compton based J. Cvach, LCWS05

  16. Undulator-Based 6D e+ emittance small enough that(probably)no pre-DR needed[shifts emphasis/challenge to DR acceptance] Lower n production rates (radiation damage) Need high-energy e- to make e+ (coupled operation) Makes commissioning more difficult Polarised positrons (almost) for free  J. Cvach, LCWS05

  17. Compton Source (KEK) J. Cvach, LCWS05

  18. Damping ring – „ochlazení svazku“ TESLA TDR500 GeV (800 GeV) 33km 47 km US Options Study500 GeV (1 TeV) J. Cvach, LCWS05

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