Volume 129, Number 6, March 2020
|Number of page(s)||4|
|Section||The Physics of Elementary Particles and Fields|
|Published online||20 April 2020|
Correlations in flavor-changing tqZ couplings constrained via experimental data
1 Institute of Theoretical Physics, University of Tokushima - Tokushima 770-8502, Japan
2 Department of Information and Computer Engineering, Okayama University of Science - Okayama 700-0005, Japan
Received: 20 January 2020
Accepted: 3 April 2020
Possible non-standard tqZ couplings, where q = c or u, originated from general flavor-changing neutral current interactions are studied model-independently using the effective Lagrangian consisting of several invariant dimension-6 operators. After the electroweak symmetry breaking, these operators are recombined to form four kinds of independent terms whose coefficients are complex in general. The Lagrangian could therefore include up to eight independent coupling parameters. Through searches for experimentally allowed regions of these parameters, it is found that some correlations exist among the signs and sizes of those couplings.
PACS: 14.65.Ha – Top quarks / 12.60.-i – Models beyond the standard model / 12.38.Qk – Experimental tests
© EPLA, 2020
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