期刊
PRAMANA-JOURNAL OF PHYSICS
卷 61, 期 1, 页码 33-50出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/BF02704509
关键词
top quark; CP violation; e(+)e(-) collider
In the presence of an electric dipole coupling of t (t) over bar to a photon, and an analogous 'weak' dipole coupling to the Z, CP violation in the process e(+)e(-) --> t (t) over bar results in modified polarization of the top and the anti-top. This polarization can be analyzed by studying the angular distributions of decay charged leptons when the top or anti-top decays leptonically. Analytic expressions are presented for these distributions when either t or (t) over bar decays leptonically, including O(alpha(s)) QCD corrections in the soft-gluon approximation. The angular distributions are insensitive to anomalous interactions in top decay. Two types of simple CP-violating polar-angle asymmetries and two azimuthal asymmetries, which do not need the full reconstruction of the t or (t) over bar, are studied. Independent 90% CL limits that may be obtained on the real and imaginary parts of the electric and weak dipole couplings at a linear collider operating at roots = 500 GeV with integrated luminosity 500 fb(-1) and also at roots = 1000 GeV with integrated luminosity 1000 fb(-1) have been evaluated. The effect of longitudinal electron and/or positron beam polarizations has been included.
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