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Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents (FCNC) to an up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the individual ATLAS and the CMS Collaborations standalone, no statistical combinations between any LHC measurements are performed. Each limit assumes that all other FCNC processes vanish. The limits are expressed as FCNC top decay branching ratios, but several are obtained considering both FCNC top quark decay and FCNC top quark production vertices. PNG November 2022 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents (FCNC) to an up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the individual ATLAS and the CMS Collaborations standalone, no statistical combinations between any LHC measurements are performed. Each limit assumes that all other FCNC processes vanish. The limits are expressed as FCNC top decay branching ratios, but several are obtained considering both FCNC top quark decay and FCNC top quark production vertices. PNG June 2022 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents (FCNC) to an up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the individual ATLAS and the CMS Collaborations standalone, no statistical combinations between any LHC measurements are performed. Each limit assumes that all other FCNC processes vanish. The limits are expressed as FCNC top decay branching ratios, but several are obtained considering both FCNC top quark decay and FCNC top quark production vertices. PNG March 2022 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. The ATLAS limits on t → q are valid for the case of a purely left-handed coupling. PNG December 2021 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. The ATLAS limits on t → q are valid for the case of a purely left-handed coupling. PNG September 2021 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. The ATLAS limits on t → q are valid for the case of a purely left-handed coupling. PNG September 2020 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. The ATLAS limits on t → q are valid for the case of a purely left-handed coupling. PNG September 2019 |

Flavour Changing Neutral Current decays | |
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Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. PNG September 2018 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. PNG May 2018 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. PNG November 2017 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. PNG September 2017 |

Summary of the current 95% confidence level observed limits on the branching ratios of the top quark decays via flavour changing neutral currents to a n up quark and a neutral boson t->Xu (X=g, Z, γ or H). The coloured lines represent the results from HERA (the most stringent limits between the ones obtained by the H1 and ZEUS collaborations, in brown), LEP (combined ALEPH, DELPHI, L3 and OPAL collaborations result, in green), TEVATRON (the most stringent limits between the ones obtained by the CDF and D0 collaborations, in grey). The yellow area represents the region excluded by the ATLAS and the CMS Collaborations. PNG November 2016 |

-- MartijnMulders - 2018-04-05 -- MariaAldaya - 2021-10-07 -- MariaAldaya - 2022-02-04 -- MariaAldaya - 2022-04-04 -- MariaAldaya - 2022-08-29 -- WolfgangWagner - 2022-11-24

Topic revision: r10 - 2022-11-24 - WolfgangWagner

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