Elementary Particles

• Fermions: particles with half-integer spin which can be transformed into other fermions or created (or destroyed) only in pairs with its anti-particle

  • Example: electron, quark
    

• Bosons: particles with integer spin which can be freely created or destroyed; carries forces between particles

  • Example: photon, gluon

• All matter described by thetheory except gravity ---Present theories are incomplete

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