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Generalization of Weinberg's Compositeness Relations

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arxiv 2110.02766 v3 pith:N4AAZ66C submitted 2021-10-06 hep-ph hep-exhep-latnucl-th

Yan Li , Feng-Kun Guo , Jin-Yi Pang , Jia-Jun Wu This is my paper · ORCID
classification hep-phhep-exhep-latnucl-th
keywords formfactorrangeweinbergcompositenessrelationscorrectionseffective
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We generalize the time-honored Weinberg's compositeness relations by including the range corrections through considering a general form factor. In Weinberg's derivation, he considered the effective range expansion up to $\mathcal{O}(p^2)$ and made two additional approximations: neglecting the non-pole term in the Low equation; approximating the form factor by a constant. We lift the second approximation, and work out an analytic expression for the form factor. For a positive effective range, the form factor is of a single-pole form. An integral representation of the compositeness is obtained and is expected to have a smaller uncertainty than that derived from Weinberg's relations. We also establish an exact relation between the wave function of a bound state and the phase of the scattering amplitude neglecting the non-pole term. The deuteron is analyzed as an example, and the formalism can be applied to other cases where range corrections are important.

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Cited by 5 Pith papers

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