Studying Same-Sign Top Pair Production through Top-Higgs FCNC Interactions at the HL-LHC

Figure 5

Cross section for the final state including two same-sign lepton at HL-LHC. Comparison of three FCNC scenarios: the matrix element of the FCNC process includes two new physics vertices which are proportional to , hence the cross section is proportional to . If quark does not involve in interactions then cross section depends only on . Since the PDF of valence quarks are high, the contribution to cross section from quarks are consideribly high. In the case of a forbidden quark interaction, cross section completely depends on while cross section is lower. In the case of scenario, both and actively participate in interactions, there is cross term in addition to the contributions from only and only c scenario. However, the total cross section is expected to be relatively higher than the case of only (as shown in Figure 5), showing that the majority of interactions carry the signature of quark distributions in the proton.