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New Physics at the LHC/ILC

New Physics at the LHC/ILC. B-L Workshop, LBNL September, 2007 Sally Dawson (BNL). Three Examples :. The Higgs Supersymmetry New Z’ boson. What do we know from the Tevatron? What will the LHC tell us? What needs the ILC?. I hope we find something we haven’t thought of yet!.

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New Physics at the LHC/ILC

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  1. New Physics at the LHC/ILC B-L Workshop, LBNL September, 2007 Sally Dawson (BNL)

  2. Three Examples: • The Higgs • Supersymmetry • New Z’ boson • What do we know from the Tevatron? • What will the LHC tell us? • What needs the ILC? I hope we find something we haven’t thought of yet!

  3. Particle Physics in tne LHC/ILC Era • Will be data driven

  4. Bat 40 Eagerly anticipating LHC data……

  5. D From the Tevatron to the LHC High pT QCD Jets Tevatron LHC  (nb) Drell-Yan production of W’s & Z’s Gluon fusion of 150 GeV Higgs 1 TeV squark/gluino pair production s (TeV) • Large increase in cross sections as we go from the Tevatron to the LHC F. Gianotti, Phys. Rep. 403, 379 (2004)

  6. Early Physics at the LHC • O(100 pb-1) per experiment by early 2009 • Early data used to calibrate detectors • Z→e+e-, +- (Tracker, ECAL, Muon chambers calibration) • tt →WbWb (Jet scale from W →jj, b-tag efficiency, etc) • Rediscover SM physics at s=14 TeV: W, Z, top, QCD

  7. Precision measurements limit Higgs Mass • LEP EWWG (July, 2007): • Mt=170.9  1.8 GeV • Mh=76+36-24 GeV • Mh < 144 GeV (one-sided 95% cl) • Mh < 182 GeV (Precision measurements plus direct search limit) 2007 Mh (GeV) Best fit in region excluded from direct searches

  8. SM Higgs Searches at Tevatron Tevatron Expected Tevatron Observed LP07

  9. Run II 2009 W, Top, and the Higgs Includes K factors MW(GeV) Mt (GeV) Mh (GeV) • Will indirect measurements agree with what the LHC sees?

  10. SM Higgs Production at the LHC Rates well understood Mh (GeV) Dawson, Jackson, Reina, Wackeroth, hep-ph/0508293

  11. ATLAS+CMS Higgs discovery potential at the LHC Assumes well understood detector Needed Ldt per experiment (fb-1) Mh(GeV) 1 fb-1: 95% C.L. exclusion 5 fb-1: 5 discovery J. Blaising et al, Eur. Strategy Workshop

  12. Is Mass Due to a Higgs Boson? Self coupling of Higgs needed to reconstruct Higgs potential. Extremely challenging at both LHC and ILC LHC measures couplings to Higgs bosons to 10-20% ILC measures couplings to Higgs bosons at few % level BR(H→X) Mh(GeV) Mh(GeV) Battaglia & Desch, hep-ph/0101165 Duhrssen, hep-ph/0406323

  13. Measuring the spin of the Higgs LHC with 300 fb-1 ILC with 20 fb-1 /point  (fb) Number of Events M(Z*) (GeV) s (GeV) • Spin is hard at the LHC! • Threshold behavior measures spin at ILC J. Aguilar-Saavedra, hep-ph/0106315 Choi, Miller, Muhlleitner, Zerwas, hep-ph/0210077

  14. MSSM Higgs Searches at the Tevatron • Dominant SUSY Higgs production mechanism is gb→b for tan  > 7 tan  tan  h, H, A  tt (D0) Mhmax, m > 0 MA (GeV) MA (GeV) LP07

  15. MSSM Higgs at the LHC tan  tan  MA (GeV) MA (GeV) • Even with a lot (!) of data there are regions where the LHC can’t get all the MSSM Higgs

  16. Squarks & Gluinos at the Tevatron Strongly interacting SUSY particles have large rates at the Tevatron and LHC Msquark (GeV) • Mgluino > 290 GeV • If Mgluino=Msquark, M > 380 GeV Mgluino (GeV) LP07

  17. mSUGRA at the Tevatron M1/2 (GeV) M1/2 (GeV) M0(GeV) M0(GeV) • Tevatron probes just the tip of the iceberg • mSUGRA is useful framework for study LP07

  18. SUSY at the LHC (pb) M1/2 (GeV) 2009 M (GeV) M0(GeV) Tevatron • Huge rates; well defined signatures • M(gluino, squark)  1 TeV gives 100 events with 100 pb-1 at LHC • Immediate improvements over Tevatron limits Tata

  19. If LSP is dark matter, and SUSY is mSUGRA…..LHC and ILC will see SUSY Region allowed in mSUGRA by WMAP with LSP as dark matter 300 fb-1 at LHC M1/2 (GeV) 100 fb-1 at ILC M0(GeV) tan =30, A0=0, >0 Baer, Belyaev, Krupovnickas, Tata, hep-ph/0311351

  20. Z’ at the Tevatron Z’ →e+ e- Many different types of Z’s are possible  BR (pb) MZ’ (GeV)

  21. New Z’ boson at the LHC Z’  e+e-with SM-couplings (SSM) • Small SM background • Narrow peak above background

  22. ILC Needed for Z’ Coupling Measurement • Which Z’ is it? • Kaluza Klein state? • Copy of standard model? • Extended gauge symmetry? ILC cleanly distinguishes between models Z’ couplings to leptons L=1 ab-1, P-=.8, P+=.6, P=.5%, sys (lep)=.2% S. Riemann

  23. Conclusions Discoveries coming soon

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