# particle physics.pdf

31 de May de 2023
1 de 9

### particle physics.pdf

• 3. Elementary Particles ➢ Infinitely hard and structureless ➢ Unbreakable ➢ It is also known as fundamental Particle ➢ The elementary particle have been classified on the basis of four properties – Mass, Lifetime, Interaction, Spin.
• 4. Quark 1. Up Quark 2. Down Quark 3. Strange Quark 4. Charm Quark 5. Top Quark 6. Bottom Quark 3 Electrons ( electron, Muon, tau ) 3 Neutrinos (electron, muon, tau)
• 5. Classification of Elementary Particle On the basis of mass - 1. Massless bosons : ✓ Zero charge ✓ Zero rest mass ✓ Zero or integral spin ✓ Stable ✓ Travel with speed of light.
• 6. Hadrons – Hadrons are those particle which do participate in Strong interaction. Hadrons Meason Baryons Hyperons Nucleons On the basis of interaction : ✓ Leptons – Leptons are those particle which do participate in weak interaction ✓ Masses are smaller than ∏ - Mesons ✓ Types – Electron , Muon,Tau ,Electron neutrino, Muon neutrino,Tau nutrino,.
• 7. ➢ Mesons means middle mass particle. ➢ All the mesons have integral spin. ➢ They are also called bosons. ➢ Masses are between those of leptons & baryons. ➢ Types – Pion, Kaon and eta particles. Mesons : Baryons: ➢ Baryon means heavy Weight. ➢ The rest mass equal to greater than the mass of protons. ➢ They are also called as fermions. ➢ All the baryons have half integral spin. ➢ Types –Lembda, Sigma, Xi, omega.
• 8. On the basis of spin: Spin Fermions Bosons ✓ Fermi particle ✓ Particle having half odd spin ½,3/2,------- ✓ Ex – Electron, neutron, proton, Quark ✓ Obey F.D statistics ✓ Antisymmetric Wavefunction ✓ Bosons particle ✓ Particles having integral Spin S=0,1,2,3,-------- ✓ Ex – Photon, Meson ✓ Obey B.E. statistics ✓ Symmetric Wavefunction