Quarks

Quarks

1. Baryons are made from 3 quarks.

   • Proton= uud. Total charge = 2/3+2/3-1/3=1. Baryon number =1/3+1/3+1/3=1
     • Antiprton= uud. Total charge= -2/3-2/3+1/3=-1. Baryon number =-1/3-1/3-1/3=-1
   • Neutron = udd. Total charge = 2/3-1/3-1/3=0. Baryon number =1/3+1/3+1/3=1
     • Antineutron=udd. Total charge= -2/3+1/3+1/3=0. Baryon number =-1/3-1/3-1/3=-1

2. Mesons are a quark and an anti-quark.

   • Pions are just made from combinations of ud down anti-up anti-down quarks
   • Kaons have strangeness so you need to put in s quarks as well.

3. The weak interaction is something that changes the quark type

   • In Beta- decay a neutron is changed into a proton - udd---udd.
   • Some unstable isotopes like carbon-11 decay by beta+ emission. In this case a proton changes into a neutron. u--d

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