John Alison PDF
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Physics at the LHC: Why and How to go Beyond the Higgs Discovery John Alison University of Chicago Outline - The Standard Model and its Problems Why the Higgs is a big deal Using the Higgs to search for new physics Processes with two Higgs Bosons (Di-Higgs Production) - Studying the Standard Model with LHC What and How Experimental Challenges - Recent Results in search for Di-Higgs Production 2 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity 3 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b 4 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b Interactions Dictated by principles of symmetry 5 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b Interactions Dictated by principles of symmetry Spin = 1 QFT ⇒ Field/Particle associated w/each interaction (Force Carriers) γ W Z g 6 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b Interactions Dictated by principles of symmetry Spin = 1 QFT ⇒ Field/Particle associated w/each interaction (Force Carriers) γ W Z g 7 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b Interactions Dictated by principles of symmetry Spin = 1 QFT ⇒ Field/Particle associated w/each interaction (Force Carriers) γ W Z g Consistent theory of electromagnetic, weak and strong forces ... ... provided massless Matter and Force Carriers 8 The Standard Model Description fundamental constituents of Universe and their interactions Triumph of the 20th century Quantum Field Theory: Combines principles of Q.M. & Special Relativity Constituents (Matter Fields/Particle) Spin = 1/2 Leptons: Quarks: ( ν ) ( ν ) ( ν ) ( u ) ( c ) ( t ) e µ τ e µ τ d s b Interactions Dictated by principles of symmetry Spin = 1 QFT ⇒ Field/Particle associated w/each interaction (Force Carriers) γ W Z g Consistent theory of electromagnetic, weak and strong forces ... ... provided massless Matter and Force Carriers Serious problem as matter and W, Z carriers known to be massive 9 The Higgs Field New field (Higgs Field) added to the theory Allows massive particles while preserve mathematical consistency Works using trick: “Spontaneously Symmetry Breaking” 10
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