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    Probing top quark FCNC couplings in the triple-top signal at the high energy LHC and future circular collider

    Khanpour, Hamzeh (2020) Probing top quark FCNC couplings in the triple-top signal at the high energy LHC and future circular collider. Nuclear Physics B, 958 (115141). ISSN 0550-3213

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    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, tqHand tqZ(σμν, γμ)vertices in the triple-top signal pp→t¯tt(¯tt¯t)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=27TeV 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 tqgand tqHtransitions 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.

    Item Type: Article
    Additional Information: Published under a Under a Creative Commons license Cite as: Hamzeh Khanpour, Probing top quark FCNC couplings in the triple-top signal at the high energy LHC and future circular collider, Nuclear Physics B, Volume 958, 2020, 115141, ISSN 0550-3213, (
    Keywords: top quark FCNC couplings; triple-top signal; high energy LHC and future circular collider;
    Academic Unit: Faculty of Science and Engineering > Theoretical Physics
    Item ID: 14790
    Identification Number:
    Depositing User: Hamzeh Khanpour
    Date Deposited: 13 Sep 2021 15:31
    Journal or Publication Title: Nuclear Physics B
    Publisher: Elsevier
    Refereed: Yes
    Funders: School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), University of Science and Technology of Mazandaran
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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