Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-09-22
Phys.Lett. B365 (1996) 244
Physics
High Energy Physics
High Energy Physics - Phenomenology
Discussion of the form of the Savage-Wise coefficients corrected; reference added
Scientific paper
10.1016/0370-2693(95)01277-X
We show that nuclear interactions are SU(4) symmetric at leading order in chiral perturbation theory in the large-N limit of QCD. The nucleons and delta resonances form a 20-dimensional representation of SU(4) and we show how Wigner's supermultiplet symmetry SU(4)_{sm}, under which the nucleons transform as a 4-dimensional representation, follows as an accidental low energy symmetry. Exploiting SU(4) symmetry allows one to express the 18 independent leading nucleon, delta interaction operators invariant under spin and isospin symmetries in terms of only two couplings. The three flavor analogue allows one to express the 28 leading octet, decuplet interactions also in terms of only two couplings, which has implications for hypernuclei and strangeness in ``neutron'' stars.
Kaplan David B.
Savage Martin J.
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