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Analysis and interpretation of new low-energy Pi-Pi scattering data | | S. Descotes
; N.H. Fuchs
; L. Girlanda
; J. Stern
; | | Date: |
5 Dec 2001 | | Journal: | Eur.Phys.J. C24 (2002) 469-483 | | Subject: | hep-ph hep-ex | | Affiliation: | Southampton), N.H. Fuchs (Purdue), L. Girlanda (Padova) and J. Stern (Orsay | | Abstract: | The recently published E865 data on charged K_e4 decays and Pi-Pi phases are reanalyzed to extract values of the two S-wave scattering lengths, of the subthreshold parameters alpha and beta, of the low-energy constants l3-bar and l4-bar as well as of the main two-flavour order parameters: and F_pi in the limit m_u = m_d = 0 taken at the physical value of the strange quark mass. Our analysis is exclusively based on direct experimental information on Pi-Pi phases below 800 MeV and on the new solutions of the Roy equations by Ananthanarayan et al. The result is compared with the theoretical prediction relating 2 a_0^0 - 5 a_0^2 and the scalar radius of the pion, which was obtained in two-loop Chiral Perturbation Theory. A discrepancy at the 1-sigma level is found and commented upon. | | Source: | arXiv, hep-ph/0112088 | | Services: | Forum | Review | PDF | Favorites | |
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