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Testing the quark-exchange contribution to the nuclear force in K − p atoms

1986; American Physical Society; Volume: 34; Issue: 5 Linguagem: Inglês

10.1103/physrevd.34.1372

1538-4500

Kim Maltman, Nathan Isgur,

High-Energy Particle Collisions Research

The strong annihilation of ${K}^{\mathrm{\ensuremath{-}}}$p atoms to \ensuremath{\Lambda}\ensuremath{\pi} and \ensuremath{\Sigma}\ensuremath{\pi} proceeds not only through intermediate resonance formation [primarily the \ensuremath{\Lambda}(1405)], but also, due to the composite structure of the hadrons involved, by means of quark rearrangements induced by residual quark-quark interactions. We evaluate the amplitudes for these rearrangement processes using a QCD-like potential model and show them to be of the correct sign and magnitude, relative to the reasonably well-known resonance contributions, to explain the experimentally observed ${K}^{\mathrm{\ensuremath{-}}}$p branching fractions. This result, in addition to being relevant to the interpretation of the \ensuremath{\Lambda}(1405), provides an independent check of the quark-exchange mechanisms believed responsible for short-distance nucleon-nucleon interactions.