NATS 1740 Lecture Notes - Lecture 5: Tau Neutrino, Quantum Chromodynamics, Quark Model

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Radu Campeanu

Document Summary

Classification of weight: hadrons (baryons: proton, neutron, etc. ) = in between: problem with weight found that even some electrons can be heavier than baryons and mesons. Leptons (electron, electronic neutrino, muon, muonic neutrino) = light. Classification by spin: universe contains two types of particles, fermions with 1/2 spin, bosons with integer spin (0,1,2) Fermions make up the matter in the universe (baryons, leptons: bosons are associated with the mechanisms of force (photon, weakon) Strong nuclear force is a weak variation of the colour force. In places where matter is in a compressed form (stars: big bang provides support for a model with 6 leptons and 6 quarks. The standard model: 24 bricks of matter, 24 anti-bricks of matter, 6 quarks, 6 leptons (electron, neutrino, muon, muonic neutrino, tau, tau neutrino, 3 possible colours in baryons. Limitations: large number of bricks, do(cid:374)"t have expla(cid:374)atio(cid:374) fo(cid:396) 3 ge(cid:374)e(cid:396)atio(cid:374)s, p(cid:396)oto(cid:374)s a(cid:374)d ele(cid:272)t(cid:396)o(cid:374)s have sa(cid:373)e (cid:272)ha(cid:396)ge (cid:271)ut o(cid:374)e has (cid:395)ua(cid:396)ks a(cid:374)d o(cid:374)e does(cid:374)"t.