%0 Journal Article
%T Can one measure C-odd asymmetry in e+e- --> pi+pi-
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Layssac, Jacques
%A Narison, Stéphan
%Z Proceedings of the QCD 08, 14th High-Energy Physics International Conference On Quantum ChromoDynamics
%< avec comité de lecture
%Z 08-079
%@ 0550-3213
%J Nuclear Physics B
%I Elsevier
%V 186
%P 203-206
%8 2009-02-10
%D 2009
%Z 0803.0696
%R 10.1016/j.nuclphysbps.2008.12.047
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Experiment [hep-ex]Journal articles
%X 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.
%G English
%L hal-00377714
%U https://hal.science/hal-00377714
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2