Abstract
Our main aim in this paper is to present detailed studies to probe the top quark flavor changing neutral current (FCNC) interactions at tqg, tqγ, tqH and tqZ(σμν,γμ) vertices in the triple-top signal pp→tt¯t(t¯tt¯) at the high energy proposal of Large Hadron Collider (HE-LHC) and future circular hadron-hadron collider (FCC-hh). To this end, we investigate the production of three top quarks which arises from the FCNC couplings taken into account the fast simulation at s=27 TeV of HE-LHC and 100 TeV of FCC-hh considering the integrated luminosities of 10, 15 and 20 ab−1. All the relevant backgrounds are considered in a cut based analysis to obtain the limits on the anomalous couplings and the corresponding branching ratios. The obtained exclusion limits on the coupling strengths and the branching ratios are summarized and compared in detail with the results in the literature, namely the most recent direct LHC experimental limits and HL-LHC projections as well. We show that, for the higher energy phase of LHC, a dedicated search for the top quark FCNC couplings can achieve much better sensitivities to the triple-top signal than other top quark production scenarios. We found that the limits for the branching ratios of tqg and tqH transitions could reach an impressive sensitivity and the obtained 95% CL limits are at least three orders of magnitude better than the current LHC experimental results as well as the existing projections of HL-LHC.
Highlights
Our main aim in this paper is to present detailed studies to probe the top quark flavor changing neutral current (FCNC) interactions at tqg, tqγ, tqH and tqZ(σμν, γμ) vertices in the triple-top signal pp → ttt at the high energy proposal of Large Hadron Collider (HE-LHC) and future circular hadron-hadron collider (FCC-hh)
We show that the sensitivity to the branching ratio of tqg and tqH channels are much better than the current LHC experimental limits, and even they are much better than the projected limits on top FCNC couplings at high luminosity (HL)-LHC with an integrated luminosity of Lint = 3000 fb−1
These findings suggest that the measurement of tqg and tqH FCNC couplings through triple-top productions at future high energy collider would carry a significant amount of information, and are the most sensitive probe to search for a new physics beyond the SM
Summary
Our main aim in this paper is to present detailed studies to probe the top quark flavor changing neutral current (FCNC) interactions at tqg, tqγ, tqH and tqZ(σμν, γμ) vertices in the triple-top signal pp → ttt (ttt) at the high energy proposal of Large Hadron Collider (HE-LHC) and future circular hadron-hadron collider (FCC-hh). To this end, we investigate quarks which arises from the FCNC couplings taken into account the the production fast simulation of at t√hrsee=to2p7. This relatively small SM production cross section of three top quarks makes it an interesting channel for investigating any signal of new physics [39]
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