Chiral-symmetry breaking and the electromagnetic interaction in the eta ---> 3pi decay
1973
9 pages
Published in:
- Phys.Rev.D 8 (1973) 2253-2261
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Abstract: (APS)
We discuss the η→3π decay within the framework of current algebra and soft-meson theorems using both the conventional electromagnetic interaction and isospin-breaking terms ("U3" terms) from the same representation as the strong interaction. The interrelation between the strong Hamiltonian and the SU(2)-violating interactions is discussed. We find that the electromagnetic interaction gives a value of the decay width which is too small by three orders of magnitude. Using isospin-breaking contributions transforminǵ as a member of the same representation of SU(3) × SU(3) as the strong Hamiltonian, the decay width is not adequately described in either the (3, 3¯)+(3¯, 3), (6, 6¯)+(6¯, 6), or (8,8) models. Consistent use of all possible soft-pion theorems demonstrates that it is incorrect to neglect certain σ terms that have been discarded in the existing literature.- eta(549): decay
- decay: eta(549)
- final state
- symmetry: chiral
- symmetry: broken
- electromagnetic interaction
- current algebra: effective lagrangians
- symmetry: su(3) x su(3)
- eta(549) --> 3pi
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