Charged pion polarizabilities to two loops
Abstract
We evaluate the electric and magnetic polarizabilities of charged pions in the framework of chiral perturbation theory at next-to-leading order. This requires a two-loop evaluation of the Compton amplitude near threshold. We estimate the two new low-energy constants which enter the chiral expansion at this order with resonance saturation. The numerical results are compared with presently available experimental information.
- Publication:
-
Physics Letters B
- Pub Date:
- February 1996
- DOI:
- 10.1016/0370-2693(96)00304-8
- arXiv:
- arXiv:hep-ph/9602421
- Bibcode:
- 1996PhLB..377..147B
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 9 pages, LaTeX, uses epsf.sty and cite.sty, one postscript picture included