The s-wave pi d scattering length from pi d atom using effective field theory

Details The s-wave pi d scattering length from pi d atom using effective field theory The s-wave pi d scattering length from pi d atom using effective field theory

2004-04-23

arxiv.org/abs/hep-ph/0404203v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages

Scientific paper

The pi- d atom strong energy-level shift in the 1s state is derived by using the effective field theory. Taking into account the large value of radius of pionic deuterium and short radius of strong interaction between pion and deuteron we have considered deuteron as particle described by vector field. Pion is described by scalar field. To obtain non-relativistic Hamiltonian for pi d system Foldy-Wouthuysen transformation has been derived for the vector field. The strong interaction between pion and deuteron has been taken at the zero-range approach. We have found the Deser type formula for relation between the strong energy-level shift and the s-wave pi d scattering length.

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