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The Spontaneous Symmetry Breaking mechanism The Higgs boson hunting at LEP and Tevatron

Discovery of the Higgs boson at LHC Measurements: mass, spin, couplings

Elementary Particle Physics:

theory and experiments

Prof. dr hab. Elżbieta Richter-Wąs

Follow the course/slides from M. A. Thomson lectures at Cambridge University and lectures by M. Kado and M. Martinez at HASCO schools.

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The ATLAS detector

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The Higgs Boson at the LHC

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(2015-2017)

10 M 1M 600k 150k

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Shown here results based on Run I

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The first LHC run

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Local p 0

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Birth of a particle

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Higgs-like particle – 4 July 2012

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Higgs-like particle – 4 July 2012

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H-> gg: events signature

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Shower shapes and vertex reconstr.

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H-> gg: background rejection

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The golden channel: H->ZZ, Z->ll

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Signal and background

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Higgs like signal with 7 TeV and 8 TeV data

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Mass measurement

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And since then ….

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And since then …

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Which Higgs boson we have discovered?

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Nobel price for predicting Higgs particle

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2013

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Entrance of the Higgs into PDG

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2013

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How we can recognize spin?

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Spin observables for H-> gg

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Spin study with H->4l

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Higgs boson decay width

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What do we measure?

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Higgs boson decay channels

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Overall comparison of all couplings results

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Combination of two experiments

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The global signal strength

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Signal strength by production and decay mode

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Constrains on three-level Higgs couplings

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Concluding Higgs couplings measurements

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What do we know from Run I

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Run II : Higgs boson mass

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Run II : Higgs boson couplings

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Run II : Higgs boson couplings to fermions

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Higgs boson couplings to top quarks

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Higgs boson production modes

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Production and decay modes

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Couplings vs mass

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ATLAS combination

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Probing rare Higgs decays

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The Higgs and the LHC

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Summary

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Cytaty

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