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Internal symmetries isospin symmetry => nuclear physics SU(3) – symmetry =>hadrons chiral summetry => pions color symmetry =>quarks electroweak symmetry => SU(2)xU(1) model >
Internal symmetries: broken by interaction ( electromagnetism breaks isospin ) broken by explicit symmetry breaking ( SU(3) – symmetry of hadrons ) unbroken ( color symmetry of quarks ) broken by spontaneous symmetry breaking ( chiral symmetry and electroweak symmetry)
Rutherford: He suggested in 1919 that there must exist a neutral partner of the proton. helium nucleus: charge: 2 x proton mass: 4 x proton
1932: discovery of the neutron (J. Chadwick) atomic nuclei are composed of protons and neutrons
nucleons: doublet of SU(2)
Lawrence Berkeley Nat. Lab
1953 pion nucleus
delta: quadruplet ( 1230 MeV )
pions: triplet eta: singlet
U(n): group of complex unitary n x n matrices SU(n): n x n matrices with det U = 1
U = exp (iH) H: Hermitean n x n matrix
det U = exp i (trH) SU(n): det U = 1 tr H = 0
SU(n): (n x n - 1) generators SU(2): 3 SU(3): 8 SU(4): 15 SU(5): 24
quarks triplet fundamental representation
irreducible representations choose state with maximal value of t(3) – proceed into the U, T and V directions to the left, until it stops
steps p and q External line of representation
each state is described by 3 numbers:
0 1 2 3 0 1 3 6 10 1 3* 8 15 24 2 6* 15* 27 42 3 10* 24* 42* 64
direct product of representations
invariant operator e.g. for angular momentum
1 0 3,3* 4/3 6,6* 10/3 8 3 10,10* 6 27 8
Bevatron in Berkeley
K-mesons: 1947 => Eta-meson: 1961
breaking of SU(3): much larger than the breaking of isospin symmetry
70 940 MeV 1190 MeV 1318 MeV 1116 MeV
71 ??? 1232 MeV 1530 MeV 1385 MeV
Physics given by a(t) - the various matrix elements => Clebsch-Gordan coefficients
f - coupling d - coupling Wigner-Eckart theorem -- SU(3)
Susumu Okubo (Rochester)
82 1236 MeV 1672 MeV ? 1232 MeV 1530 MeV 1385 MeV
85 496 MeV 138 MeV 958 MeV548 MeV 496 MeV
mixing changes the masses lower state lower higher state higher Experiment: mixing angle about 16 degrees
Why pi mesons have a small mass? Gell-Mann, Oakes, Renner (1968) Chiral Symmetry SU(3) => SU(3,L) x SU(3,R)
Chiral symmetry breaking: all eight mesons acquire masses
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