CP violation and electric-dipole-moment at low energy tau-pair production

Details CP violation and electric-dipole-moment at low energy tau-pair production CP violation and electric-dipole-moment at low energy tau-pair production

2004-04-21

arxiv.org/abs/hep-ph/0404185v2

Nucl.Phys. B701 (2004) 87-102

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 2 figures, references added, minor changes in section 3 and 5, to be published in Nucl.Phys.B

Scientific paper

10.1016/j.nuclphysb.2004.08.038

CP violation at low energy is investigated at the tau electromagnetic vertex. High statistics at B factories, and on top of the Upsilon resonances, allows a detailed investigation of CP-odd observables related to the tau-pair production. The contribution of the tau electric dipole moment is considered in detail. We perform an analysis independent from the high energy data by means of correlation and linear spin observables at low energy. We show that different CP-odd asymmetries, associated to the normal-transverse and normal-longitudinal correlation terms can be measured at low energy accelerators, both at resonant and non resonant energies. These observables allow to put stringent and independent bounds to the tau electric dipole moment that are competitive with other high or low energy results.

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