Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-14
Phys.Atom.Nucl. 67 (2004) 614-632; Yad.Fiz. 67 (2004) 634-652
Physics
High Energy Physics
High Energy Physics - Phenomenology
34 pages, LaTeX, 5 figures, epsfig.sty
Scientific paper
10.1134/1.1690072
The constraints followed from gauge invariance and analyticity are considered for the amplitudes of radiative transitions of composite systems when composite systems are treated in terms of spectral integrals. We discuss gauge-invariant amplitudes for the transitions S -> gamma S and V -> gamma S with scalar S and vector V mesons being two-particle composite systems of scalar (or pseudoscalar) constituents, and we demonstrate the mechanism of cancellation of false kinematical singularities. Furthermore, we explain how to generalize the performed consideration for quark-antiquark systems, in particular, for the reaction phi(1020) -> gamma f0(980). Here we also consider in more detail the quark-model non-relativistic approach for this reaction.
Anisovich V. V.
Matveev M. A.
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