8.6 Mesons and Baryons Flashcards
What is a hadron?
particles made up of quarks
What are the 2 types of hadrons?
Mesons and baryons
How are hadrons classified?
By number of quarks that make them up
How many quarks or antiquarks make up a baryon?
3
What are two baryons I have to know about?
Proton and Neutron
What is a proton made up of ?
up up down
What is a neutron made up of?
down down up
What is an anti particle of proton made up of?
anti up anti up anti down
What is an anti particle of neutron made up of?
anti down anti down and anti up
Can anti quarks and quarks be mixed to make up a baryon?
Nope!
What is the only stable baryon?
Proton, as far as we know it doesn’t decay
Does a neutron decay?
Yes, if it is free
Are the antiparticles of protons and neutrons baryons?
Yes
In a particle interaction is the baryon number always conserved?
Yes, the same number must be present either side
What is the baryon number of a proton and a neutron?
What about their antiparticles?
1
-1
A baryon containing a single strange quark has what symbol to represent it ?
sigma
A baryon containing 2 strange quarks is a what ?
An xi
A baryon containing 3 strange quarks is called a what ?
An omega
What is a meson?
Hadron made up of 2 quarks, a combination of a quark and antiquark
Are all mesons unstable?
yes
What is the group of mesons I have to know about?
Pions
What are the versions of pions i have to know about?
π+ = u and anti d π0 = u and anti u π0 = d and anti d π- = down and anti u
What is the names of mesons with one strange quark?
a kaon
Name of meson with 2 strange quarks?
eta meson symbol = η0
What are the 4 conservation laws of particle interaction equations? - apply to fundamental particles
- conserved baryon number
- conserved charge
- lepton number is conserved
- strangeness number is conserved
Lightest type of mesons?
Pions
