Ulrich Heintz Brown University

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the standard model spin ½ spin 1 electromagnetism acts on all charged particles strong force acts on all quarks weak force acts on all particles 3/24/2011 Ulrich Heintz - Moriond QCD 2
gauge theories • gauge theories describe all three interactions Lagrangian invariant under continuous group of local transformations • quantum electrodynamics Lagrangian invariant under local phase transformations need interactions of charged particles with a gauge field exactly describes electromagnetic interactions the quantum of the gauge field is the photon photon is mediator of the electromagnetic force • electroweak theory (Glashow 1960) gauge theory of QED and weak interactions larger symmetry group additional gauge field quanta: W ± and Z 0 bosons weak force is short range W and Z are massive PROBLEM: cannot describe massive particles without breaking the symmetry 3/24/2011 Ulrich Heintz - Moriond QCD 3 e e ν νe γ ZW e e e eν
Page 1: Hunting for the Higgs Boson Ulrich
Page 5 and 6: not just a nice idea • 1973 - Gar
Page 7 and 8: the mass of the Higgs boson • not
Page 9 and 10: theoretical problems • there is n
Page 11 and 12: L3 DELPHI e + e - collisions 1989:
Page 13 and 14: Higgs decay • look for Z+Higgs M
Page 15 and 16: signal or fluctuation? • 3 select
Page 17 and 18: 2000: the end of LEP 3/24/2011 Ulri
Page 19 and 20: Higgs production at Tevatron g g q
Page 21 and 22: Higgs search at Tevatron ZH ννbb
Page 23 and 24: can we see such a small signal? WW
Page 25 and 26: will the Tevatron find the Higgs? M
Page 27 and 28: Higgs production at LHC Higgs produ
Page 29 and 30: the CMS experiment • homogeneous
Page 31 and 32: LHC Operations • 2010: - delivere
Page 33 and 34: LHC projections W. Quayle - this co

Ulrich Heintz Brown University

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