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The Hunt for the Higgs

We do not know the mass of the Higgs Boson . Where . The key question: . do . the . masses . Scalar field with at least . come from. Where is the Higgs?. one scalar particle . ?. It could be anywhere from 114 to 700 GeV. The Hunt for the Higgs . . The Compact Muon Solenoid.

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The Hunt for the Higgs

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  1. We do not know the mass of the Higgs Boson Where The key question: do the masses Scalar field with at least come from Where is the Higgs? one scalar particle ? It could be anywhere from 114 to 700 GeV The Hunt for the Higgs 

  2. The Compact MuonSolenoid

  3. Searches for the Higgs Particle A Higgs particle will decay immediately, eg in two heavy quarks or two heavy (W,Z) bosons • Example: Higgs(?) decays into ZZ and each Z boson decays into μμ But two Z bosons can also be produced in LHC collisions, without involving a Higgs! We cannot say for on event by event (we can use the total invariant mass of the 4 muons) So we look for 4 muons in the detector

  4. A Collision with two Photons A Higgs or a ‘background’ process without a Higgs?

  5. CMS Higgs Studies

  6. The 2011 Data Combination What did we learn from the data last year? Dashed line: expected sensitivity Solid line: actual data Standard Model Higgs should be above the red line Expected exclusion 114.5 - 543 GeV Observed exclusion 127.5 - 600 GeV

  7. So, where is the Higgs Boson? • The experiments analysed the data for the full year of 2011 • They can exclude an even larger range, and restrict the region for the Higgs to 115-130 GeV • But.. they see a tantalizing excess in the “Higgs” mass range of 120-126 GeV. This is exciting! • The significance of this excess is still too low to claim a discovery, but a Higgs signal could just start to be seen just like that. The excess could still go away with more data. • The Higgs boson could well be showing signs of life already in the 2011 data… • The LHC 2012 data will be the referee…

  8. LHC is doing very well Last year: luminosity 3 . 1033 cm-2 s-1 5.7 fb-1 collected in total This year: luminosity 6.5 . 1033 cm-2 s-1 6.2 fb-1 collected so far Luminosity = number of events/cross section/time

  9. What about the 2012 data? The ZZ and γγevents are there in 2012! Will they be at a similar rate as for the 2012 data? Will the 2012 confirm the 2011 excess? ->A discovery is possible… The 2012 data will be disclosed today at CERN and ICHEP/Melbourne ZZ-> μμee event 2 photon event

  10. The Higgs

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