1. CLASSIFICATION OF ELEMENTARY
PARTICLES
Presented by – Anjali Dahikar

2. Structure of an Atom

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

9. THANK YOU ‼