Collider sensitivity to SMEFT heavy-quark operators at one-loop in top-quark processes
arxiv(2024)
摘要
We study the effects of four-heavy-quark operators in the production of top
quarks in the framework of the Standard Model Effective Field Theory (SMEFT) at
the LHC. In particular, we compute for the first time the total contribution of
the four-top-quark operator which enters only at the one-loop level in the
top-quark pair production process. Analytical results at one-loop are presented
for the gluon- and quark-initiated sub-processes, which allowed a first
complete validation of the SMEFT@NLO in Madgraph5_aMC@NLO. The 95
four-heavy-quark operators from the available top-quark pair and four-top-quark
production data are provided, which are complementary to other bounds found in
the literature. We focus on the comparison of the sensitivities of the
top-quark pair and the four-top-quark production processes, where in the latter
case the four-top-quark operator contributes at tree-level. We conclude that
the sensitivities of the two processes to four-heavy-quark operators are
comparable. The projected sensitivities of both processes at HL-LHC are also
presented.
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