Sumários

Exercise class 12

27 Maio 2022, 08:30 • João Nuno Ramalho Gonçalves Pires

Discussion and solution of the twelfth series of exercises.

Theory lecture 13

25 Maio 2022, 08:30 • João Nuno Ramalho Gonçalves Pires

  • Top quark discovery at the Tevatron
  • Higgs searches at LEP and the Tevatron
  • Higgs mechanism: spontaneous symmetry breaking of global U(1) symmetry: goldstone bosons
  • Higgs mechanism: spontaneous symmetry breaking of local U(1) gauge theory: massive gauge fields and unitary gauge
  • The Standard Model Higgs doublet: symmetry breaking of the local SU(2)_L x U(1)_Y EW theory
  • Mass terms for the W+,W- and Z0 gauge fields of the EW interaction
  • Fermion mass terms and Yukawa interactions between the Higgs and the Standard Model fermions
  • Experimental Higgs discovery at the LHC
  • Higgs boson properties
  • Review of the building blocks of the Standard model and the free parameters of the theory
  • Open questions left unanswered in the Standard Model
Recommended reading: Chapters 17 and 18 of Mark Thomoson's book. Chapter 11 of D.Griffith's book.

Exercise class 11

20 Maio 2022, 08:30 • João Nuno Ramalho Gonçalves Pires

Discussion and solution of the eleventh series of exercises.

Theory lecture 12

18 Maio 2022, 08:30 • João Nuno Ramalho Gonçalves Pires

  • The W-boson decay
  • The weak interaction gauge group SU(2)_L
  • Charged and neutral weak currents of the SU(2)_L gauge group
  • Electroweak unification in the Glashow, Salam, Weinberg (GSW) model of the electroweak interactions: SU2_L x U1_Y
  • Photon and Z vector fields and the Weinberg angle
  • Weak-hypercharge particle assignments
  • Z-boson neutral current and Z-boson couplings to fermions
  • Experimental discovery of the neutral currents
  • Precision tests of the GSW model of the electroweak interaction at LEP
  • Z-boson mass and width measurements at LEP
  • Leptonic forward and backward assymetry in leptonic decays of the Z and the measurement of the Weinberg angle
  • W+W- cross section measurements at LEP
  • W boson mass and width measurements at LEP
Recommend reading: Chapters 15 and 16 of Mark Thomson's book, Chapter's 10.6 and 10.7 of D.Griffith's book. 

Exercise class 10

13 Maio 2022, 08:30 • João Nuno Ramalho Gonçalves Pires

Discussion and solution of the tenth series of exercises.