https://doi.org/10.1051/epjconf/202431501028
µ−µ+ → νµνµttH amplitudes in the Feynman-diagram gauge
Faculty of Education, Iwate University, Morioka, Iwate 020-8550, Japan
* e-mail: yjzheng@iwate-u.ac.jp
Published online: 18 December 2024
We study the process µ−µ+ → νµῡµ tt¯H with complex CP violating ttH couplings in the SMEFT with a dimension-6 operator. When the amplitudes are expressed in the Feynman-Diagram gauge, the dominance of the total cross section via the weak boson fusion diagrams is manifest. The high energy behaviour is dictated by the higher-dimensional vertices in the dimension-6 SMEFT operator. These properties are not manifest in the unitary gauge because of subtle cancellation among diagrams.
© The Authors, published by EDP Sciences, 2024
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