PHYS 3446 LECTURE NOTES (37 pages)

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PHYS 3446 LECTURE NOTES



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PHYS 3446 LECTURE NOTES

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Pages:
37
School:
University of Texas at Arlington
Course:
Phys 3446 - Nuclear and Particle Physics
Nuclear and Particle Physics Documents

Unformatted text preview:

PHYS 3446 Lecture 22 Wednesday Nov 29 2006 Dr Jae Yu 1 The Standard Model Symmetry Breaking and the Higgs particle Higgs Search Strategy Neutrino Oscillations Issues in the Standard Model 2 Feynmann Diagrams Wednesday Nov 29 2006 PHYS 3446 Fall 2006 Jae Yu 1 Spontaneous Symmetry Breaking While the collection of ground states does preserve the symmetry in L the Feynman formalism allows to work with only one of the ground states through the local gauge symmetry Causes the symmetry to break This is called spontaneous symmetry breaking because symmetry breaking is not externally caused The true symmetry of the system is hidden by an arbitrary choice of a particular ground state This is the case of discrete symmetry w 2 ground states Wednesday Nov 29 2006 PHYS 3446 Fall 2006 Jae Yu 2 EW Potential and Symmetry Breaking Not symmetric about this axis 1 2 2 1 2 4 2 4 Symmetric about this axis Wednesday Nov 29 2006 PHYS 3446 Fall 2006 Jae Yu 3 The Higgs Mechanism Recovery from a spontaneously broken electroweak symmetry gives masses to gauge fields W and Z and produce a massive scalar boson The gauge vector bosons become massive W and Z s The massive scalar boson produced through this g ig ism H spontaneous EW symmetry breaking is the Higgs particle he han T ec M In SM the Higgs boson is a ramification of the mechanism that gives masses to weak vector bosons leptons and quarks Wednesday Nov 29 2006 PHYS 3446 Fall 2006 Jae Yu 4 Higgs Production Processes at Hadron Colliders Gluon fusion WW ZZ Fusion Higgs strahlung off W Z gg H W W ZZ H qq W Z W Z H Higgs Bremsstrahlung q q gg t t H off top Wednesday Nov 29 2006 PHYS 3446 Fall 2006 Jae Yu 5 Hadron Collider SM Higgs Production LHC We use WH e b b channel for search for Higgs at Tevatron Wednesday Nov 29 2006 Tevatron PHYS 3446 Fall 2006 Jae Yu 6 SM Higgs Branching Ratio Wednesday Nov 29 2006 2 140GeV cPHYS 3446 Fall 2006We use WH e b b 7 Jae Yu channel for search for Higgs How do we find the Higgs particle Look for WH l b b bar



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