Composite vertices that lead to soft form factors

Details Composite vertices that lead to soft form factors Composite vertices that lead to soft form factors

1995-03-09

arxiv.org/abs/nucl-th/9503009v1

Phys.Rev.C51:3427-3434,1995

Physics

Nuclear Physics

Nuclear Theory

REVTex, 19 pages, 5 figs(to be provided on request)

Scientific paper

10.1103/PhysRevC.51.3427

The momentum-space cut-off parameter $\Lambda$ of hadronic vertex functions is studied in this paper. We use a composite model where we can measure the contributions of intermediate particle propagations to $\Lambda$. We show that in many cases a composite vertex function has a much smaller cut-off than its constituent vertices, particularly when light constituents such as pions are present in the intermediate state. This suggests that composite meson-baryon-baryon vertex functions are rather soft, i.e., they have \Lambda considerably less than 1 GeV. We discuss the origin of this softening of form factors as well as the implications of our findings on the modeling of nuclear reactions.

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