21 cern switzerland short lived matter a veritable zoo

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: icles at each Directing other at ferocious energies can make new stuff other • It’s like reproducing the Big Bang, but at lower energies particle Lots ‘o stuff antiparticle 20 Particle Accelerators are Big! 21 CERN, Switzerland Short-Lived Matter • A veritable zoo of particles (muon, tau, mesons, veritable hadrons....) hadrons....) • Confusion in the 1960’s – things seemed to be getting Confusion worse! worse! – hundreds of “new” particles observed • Recognition in 1970’s, 1980’s that there was order to all Recognition this mess this – Electron has two short-lived siblings (muon, tau), each has a neutrino cousin (lepton family) – Nuclear matter is made up of 6 quarks, arranged as three generations with 2 members each – Imagine all the combinations! 22 The Standard Model of Particle Physics As far as we know these particles have no constituents. Basic Ingredients are quarks and the electron-like objects (leptons) (leptons) Fundamental forces are mediated by photon, gluons, W’s and Z’s (bosons) (Fermilab) 23 Quark Soup • Combinations of quarks make up all the exotic Combinations particles cataloged in the 1960s particles – 6 quarks, 6 anti-quarks, grouped in twos and threes – Many dozens of combinations, only protons and neutrons are stable (and neutrons decay when not in nuclei) – Charg...
View Full Document

This note was uploaded on 01/31/2014 for the course BILD 3 taught by Professor Wills during the Winter '07 term at UCSD.

Ask a homework question - tutors are online