An introduction to the quark model

Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook
Improvements: fine structure
ψ ′ → χJ + γ , χJ → J/ψ + γ ,
Masses accurately measured with antiprotons
analysed with
to first order
M( 3 P0) = Mt − 2 〈Vls〉 − 4 〈Vt〉 ,
M( 3 P1) = Mt − 〈Vls〉 + 2 〈Vt〉 ,
M( 3 P2) = Mt + 〈Vls〉 − 2
〈Vt〉 ,
5
V (r) + Vss(r) σ1.σ2 + Vls(r) ℓ.s + Vt(r) S12 ,
Mt = 1
M(
9
3 P0) + 3 M( 3 P1) + 5 M( 3
P2) ,
〈Vls〉 = 1
−2 M(
12
3 P0) − 3 M( 3 P1) + 5 M( 3
P1) ,
〈Vt〉 = 5
2 M(
72
3 P0) − 3 M( 3 P1) + M( 3
P1) .
JMR Quark Model