DOI: 10.1140/epjc/s2002-01087-0
CP-violation in the production of
-leptons
at TESLA with beam polarization
B. Ananthanarayan1, S.D. Rindani2 and A. Stahl3
1 Centre for Theoretical Studies, Indian Institute of Science, Bangalore 560 012, India
2 Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
3 DESY, Platanenallee 6, 15738 Zeuthen, Germany
(Received: 13 June 2002 / Revised version: 17 October 2002 Published online: 20 December 2002)
Abstract
We study the prospects of discovering
CP-violation in the production
of
leptons in the reaction
at TESLA,
an
e+e- linear collider with center-of-mass energies of
500 or even
800 GeV.
Non-vanishing expectation values of certain correlations between
the
momenta of the decay products of the two
leptons would
signal
the presence of
CP-violation beyond the standard model.
We study how longitudinal beam polarization of the electron and
positron
beams will enhance these correlations.
We find that
T-odd and
T-even vector correlations are well
suited
for
the measurements of the real and imaginary parts of the electric
dipole form factors.
We expect measurements of the real part with a precision of roughly
10-20
e cm and of the imaginary part of
10-17
e cm.
This compares well with the size of the expected effects in many
extensions
of the standard model.
© Società Italiana di Fisica, Springer-Verlag 2003
