A helpful analogy between the covalent bond and Particle Spectroscopy

Details A helpful analogy between the covalent bond and Particle Spectroscopy A helpful analogy between the covalent bond and Particle Spectroscopy

2010-04-06

arxiv.org/abs/1004.0815v1

J.Phys.G37:055002,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures. A major revision of an earlier paper.

Scientific paper

10.1088/0954-3899/37/5/055002

It is proposed that meson resonances are linear combinations of q-qbar and meson-meson (MM); baryon resonances are combinations of qqq and meson-baryon (MB). Mixing between these combinations arises via decays of confined states to meson-meson or meson-baryon. There is a precise analogy with the covalent bond in molecular physics; it helps to visualise what is happening physically. One eigenstate is lowered by the mixing; the other moves up and normally increases in width. Cusps arise at thresholds. At sharp thresholds due to S-wave 2-particle decays, these cusps play a conspicuous role in many sets of data. The overall pattern of light mesons is consistent with nearly linear Regge trajectories, hence q-qbar components. There is no obvious reason why this pattern should arise from dynamically generated states without q-qbar content.

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