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Can one measure C-odd asymmetry in e+e- --> pi+pi- ![]() Auteur(s): Layssac Jacques, Narison S.
(Article) Publié:
Nuclear Physics B, vol. 186 p.203-206 (2009)
Texte intégral en Openaccess : Ref HAL: hal-00377714_v1 Ref Arxiv: 0803.0696 DOI: 10.1016/j.nuclphysbps.2008.12.047 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 3 citations Résumé: C-odd asymmetry can be studied from an accurate measurement of the angulardistribution due to the interference between the S- and P-waves in e+e- --> pi+pi- at order alpha^3. The asymmetry is dominated by the pion rescatteringdiagram which is enhanced by the presence of the ln(s/m^2_e), and is quitelarge (10% at theta=30^0 and sqrt{s} < M_{f_2}) compared to alpha/pi=0.3%. Thisprocess can also be used for alternatively measuring the size of therescattering term and the phase of the S-wave amplitude, but does not help tosolve the present discrepancy between the hadronic spectral functions from e+e-and tau-decay data. Commentaires: Proceedings of the QCD 08, 14th High-Energy Physics International Conference On Quantum ChromoDynamics |