Summary
The analytic behaviour in the complex angular momentum plane, of the amplitude for a vector meson coupled to a scalar « nucléon » through a conserved current is examined. The graph with the exchange of two vector mesons is considered. This graph is iterated in the vector meson channel (called s channel). The partial wave projection of the lowest order graph (4th order) has a simple pole atl = 1, which is obtained after an analytical continuation from higherl. When the singular part of the graph atl=1 is taken as the kernel of the Bethe-Salpeter equation it is found that fors ≠ 6μ 2its solution has two simple moving poles in the neighbourhood ofl=1 in thel-plane. However, the Regge trajectory has two branches which intersect each other at the branch points = 6μ 2.
Riassunto
Si esamina nel piano del momento angolare complesso il comportamento analitioo dell’ampiezza di un mesone vettoriale acccppiato a un « nucleone » scalare per mezzo di una corrente conservata. Si parte dal grafico con lo scambio di due mesoni vettoriali e lo si itera nel canale dei mesoni vettoriali (detto canales). La proiezione dell’onda parziale del grafico dell’ordine più basso (quarto ordine) ha un polo semplice inl=1 che si ottiene dopo oontimiazione aaalitica da unl superiore. Prendendo la parte singolare del grafioo inl=1 come nocciolo dell’equazione di Bethe-Salpeter si trova che perS≠ 6μ 2la soluzione ha due poli semplioi mobili in prossimità dil = l nel pianol. Tuttavia, la traiettoria di Regge ha due rami che si intersecano nel punto di diramaziones =6μ 2.
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The research reported in this document has been sponsored in part by the Air Force Office of Scientific Research OAR through the European Office Aerospace Research U. S. Air Force.
On leave of absence from Institute « Rudjer Bošković », Zagreb, Yugoslavia.
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Martinis, M., Ahmed, K. Vector mesons and complex angular momentum. Nuovo Cim 38, 1021–1039 (1965). https://doi.org/10.1007/BF02748613
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DOI: https://doi.org/10.1007/BF02748613