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Pion-pion scatterin...
Pion-pion scattering at low energy
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- Bijnens, J. (author)
- Lund University,Lunds universitet,Teoretisk partikelfysik - Geonomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Theoretical Particle Physics - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Colangelo, G. (author)
- INFN Frascati National Laboratory
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- Ecker, G. (author)
- University of Vienna
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- Gasser, J. (author)
- University of Bern
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- Sainio, M. E. (author)
- University of Helsinki
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(creator_code:org_t)
- 1997
- 1997
- English 48 s.
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In: Nuclear Physics B. - 0550-3213. ; 508:1-2, s. 263-310
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Abstract
Subject headings
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- We present technical details of the evaluation of the elastic ππ scattering amplitude to two loops in chiral perturbation theory. In particular, we elaborate on the renormalization procedure at the two-loop order and on the evaluation of the relevant Feynman diagrams that can all be expressed in terms of elementary functions. For the sake of clarity, we discuss these matters both in the N-component φ4 theory (in its symmetric phase) and in chiral perturbation theory. Estimates for the relevant low-energy constants of O(p6) are presented. Threshold parameters and phase shifts are then calculated for two sets of O(p4) coupling constants and compared with experiment. We comment on the extraction of threshold parameters from phase shift data.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- Chiral perturbation theory
- Chiral symmetry
- Pion-pion scattering
Publication and Content Type
- art (subject category)
- ref (subject category)
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