SYNTHESIS The Standard Model 1.Elementary particles 2.Strong nuclear force 3.Weak nuclear force 4.The Standard Model.

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Presentation transcript:

SYNTHESIS The Standard Model 1.Elementary particles 2.Strong nuclear force 3.Weak nuclear force 4.The Standard Model

Known Elementary Particles of Matter Quarks : Up (u), Down (d), Strange (s), Charm (c), Bottom (b), Top (t) Leptons : Electron (e), Muon (μ), Tau (τ), Neutrino (ν) [3 types] Known Forces of Nature Force Carrier Particles: QED -> Photon (γ) Weak -> W, Z Strong -> Gluon (g) Standard Model

Strong Nuclear Force Q uantum C hromo D ynamics Binds protons and neutrons inside atomic nucleus Quarks always occur either in groups of THREE (Baryon) e.g. uud = proton, udd = neutron or quark & anti-quark (Meson) Baryons & Mesons are HADRONS: Feel the strong force

Quarks are permanently confined inside Hadrons – they have never been isolated. Because QCD force between quarks does not reduce with separation (unlike electric & gravity forces) More and more energy is needed to separate quarks This added energy converts to mass (via E=mc 2 ) of new quarks One meson Two mesons

Why does QCD confine quarks? Extra vertices allow force particle (gluon) itself to feel force

Weak Nuclear Force Cause of β radioactivity Carried by very massive W or Z particles (highly improbable) Electron Neutrino Almost massless Very weak interactions

Origin of Mass All particles really massless! Slowed down from c by interacting with Higgs Only appear to have mass. Higgs particles directly created in 2012

Describes all matter and forces (except gravity)