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Higgs boson discovery by LHC experiments: a dream of many of us which became true

Higgs boson discovery by LHC experiments: a dream of many of us which became true. E. Richter-Was Insitute of Physics , Jagiellonian University. Credit to many ATLAS colleagues from whom I have borrowed ideas for slides. A bit of history The 4 July 2012 announcement

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Higgs boson discovery by LHC experiments: a dream of many of us which became true

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  1. Higgs boson discovery by LHC experiments: a dream of many of uswhich became true E. Richter-Was Insitute of Physics, JagiellonianUniversity Credit to many ATLAS colleagues from whom I have borrowed ideas for slides A bit of history The 4 July 2012 announcement Latest results onHiggsboson from ATLAS experiment New results from SM EW fit Looking forward

  2. The Higgsparticle It has been a long journey to the Higgs discovery: more than 40 years!! Observation of Higgs-like particle at LHC announced on 4 July 2012 Nobel Prize in physics for F. Englert and P. Higgs in 2013

  3. Collisions at Large Hadron Collider (LHC) Nominalparameters

  4. Towards LHC: a briefhistory A 25 years of preparations

  5. LEP-1: from 1985 to 1995

  6. LEP-1: final Higgs combination

  7. LEP-2: up to 1999

  8. LEP-2: LEP operation in 2000 mass ~ 110 - 115 GeV observed by 3 experiments

  9. Tevatron: Run II 2001 - 2011 Fermilab (USA)

  10. Higgs mass constraints from precision EW fits

  11. LHC CERN CERN labolatory

  12. LHC era: What we expected before starting a machine? Signalsignificance (simulation)

  13. LHC: September 2008: LHC on hold

  14. Tevatron: 2009 firstexclusion

  15. Recordedpp data overthreeyears of „Run-1”

  16. LHC era: The path to Higgsdiscovery Reporting on increasingsensitivity to Higgsbosonobservation/exclusionat major conferencessincesummer 2011

  17. LHC: July 2012 publications

  18. Publications

  19. H->gg

  20. H->gg: photonreco/identification

  21. H->gg: backgroundrejection

  22. H->ZZ*->4l

  23. H->WW*->lnln

  24. Mass measurement

  25. Signalstrengthsm = s/sSM

  26. Spin-parity

  27. Productionprocesses

  28. After the Higgs: the EW fit of the SM

  29. State of the SM: W versus top mass

  30. State of the SM: W mass versus sin2qleff

  31. Indirecteffectiveweakmixingangle

  32. Indirectdetermination of W mass

  33. The LHC landscape in the nextdecade(s)

  34. Summary: continuing the dream • Fantastic delivery from the LHC accelerator and its teams in „Run1”. • Maintained excellent performance of ATLAS despite beyond-design pileup – ingenious performance work and highly capable detector. • Fully corrected SM measurements challenge MC models in many areas • Moved beyond the discovery phase for the Higgs boson • JP =0+ strongly favoured • Higgs analysed now entered measurement phase • Wide range of searches explore more parts of SUSY space, and increasingly complex BSM signatures • TheLHC programmes have only just begun!

  35. pre-LEP era: a falsesignal: 1984 First limitsstarts to be published, eg. CLEO, SINB+DRUM, CUBS

  36. ATLAS Detector

  37. Measurements: cross-sections

  38. Prospects for Higgsmeasurement precision

  39. Couplings to fermions - production

  40. pre-LEP era: late 80’s, early 90’s

  41. Direct darkmattersearches

  42. ATLAS upgrades for HL-LHC

  43. What do we want to measure?

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