Classification of Particles Flashcards

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1
Q

What are Hadrons?

A
  • Hadrons are a group of subatomic particles that are made up of quarks and can interact via strong nuclear force
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2
Q

What are the two classes of Hadrons?

A
  • Baryons like protons and neutrons (particles that can decay into a proton and particles are made up of 3 quarks)
  • Mesons like pions and kaons (particles that can’t decay into a proton and particles are made up of a quark and antiquark pair)
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3
Q

State the difference of anti-hadrons

A
  • Anti-baryons now have 3 anti-quarks instead of 3 quarks
  • Anti-mesons quark now becomes an anti-quark and it’s anti-quark now becomes a quark
  • Combination of quarks and anti-quarks don’t exist in baryons
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4
Q

Describe how a baryon number is used

A
  • Baryons have a baryon number of +1
  • Anti-baryons have a baryon number of -1
  • Particles that are not baryons have a baryon number of 0
  • In all interactions, the baryon number is conserved
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5
Q

What is the proton as a baryon?

A
  • Proton is the most stable baryon
  • Longest half-life than any baryon
  • Particle that all baryons eventually decay into
  • Lightest baryon (which is why it is stable)
  • Radioactive decay occurs when heavier particles decay into lighter particles
  • A decay of the proton would therefore violate the conservation of baryon number
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6
Q

What are gluons/pions?

A
  • Pions (π–mesons) can be positive (π+ ), negative (π- ) or neutral (π 0)
  • Lightest meson (most stable meson)
  • Both pions and gluons are exchange particles of the strong force
  • Gluons bind quarks together (strong interaction)
  • Pions bind nucleons together (strong nuclear force)
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7
Q
A
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