Constraints on top quark FCNC from electroweak precision measurements

Details Constraints on top quark FCNC from electroweak precision measurements Constraints on top quark FCNC from electroweak precision measurements

2004-12-16

arxiv.org/abs/hep-ph/0412222v2

Phys.Rev. D72 (2005) 057504

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 figures. References added. Errors corrected. Numerical results for BR have changed

Scientific paper

10.1103/PhysRevD.72.057504

We study the one-loop contributions of the effective flavor changing neutral couplings (FCNC) tcZ and tcH on the electroweak precision observables Gamma_Z, R_c, R_b, R_l, A_c and A^FB_c. Using the known experimental limits on these observables, we may place 95% CL bounds on these FCNC couplings which in turn translate into the following limits for the branching ratios: BR(t -> cZ) < 6.7 10^-2 and BR(t -> cH) < (0.09 - 2.9) 10^-3 for 114 < m_H < 170 GeV.

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