${\mathit {\mathit t}}$ BRANCHING RATIOS

INSPIRE search

Q007R01
VALUE ($ 10^{-4} $) CL% DOCUMENT ID TECN  COMMENT
$\bf{<3.4}$ 95 1
AAD
2024AU
 ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ or ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ (combined ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ , ${{\mathit Z}}{{\mathit Z}}$ , ${{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit b}}{{\mathit b}}$)
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<4.3$ 95 2
HAYRAPETYAN
2025AD
 CMS 2${{\mathit \ell}}$ (same sign) +${}\geq{}$1j
$<3.3$ 95 3
AAD
2024AU
 ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ or ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ , ${{\mathit Z}}{{\mathit Z}}$ , ${{\mathit \tau}}{{\mathit \tau}}$)
$<4.3$ 95 4
AAD
2023CJ
 ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ or ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$)
$<5.8$ 95 5
AAD
2023CJ
 ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ or ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ (combined with ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$, ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$, ${{\mathit H}}$ $\rightarrow$ ${{\mathit \tau}_{{{h}}}}{{\mathit \tau}_{{{h}}}}$)
$<9.4$ 95 6
AAD
2023H
 ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ or ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \tau}_{{{h}}}}{{\mathit \tau}_{{{h}}}}$)
$<7.3$ 95 7
TUMASYAN
2022A
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$)
$<9.4$ 95 8
TUMASYAN
2022K
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$)
$<11$ 95 9
AABOUD
2019S
 ATLS combination of ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ , ${{\mathit Z}}{{\mathit Z}}$ , ${{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit b}}{{\overline{\mathit b}}}$)
$<42$ 95 10
AABOUD
2019S
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$)
$<19$ 95 11
AABOUD
2019S
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$)
$<16$ 95 12
AABOUD
2018X
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ , ${{\mathit Z}}{{\mathit Z}}$ , ${{\mathit \tau}}{{\mathit \tau}}$)
$<47$ 95 13
SIRUNYAN
2018BC
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$)
$<22$ 95 14
AABOUD
2017AV
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$)
$<4\times 10^{1}$ 95 15
KHACHATRYAN
2017I
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit W}}{{\mathit W}}$ , ${{\mathit Z}}{{\mathit Z}}$ , ${{\mathit \tau}}{{\mathit \tau}}$ , ${{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit b}}{{\overline{\mathit b}}}$)
$<56$ 95 16
AAD
2015CO
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$)
$<79$ 95 17
AAD
2014AA
 ATLS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit q}}$ (${{\mathit q}}={{\mathit u}},{{\mathit c}}$; ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$)
$<1.3\times 10^{2}$ 95 18
CHATRCHYAN
2014R
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${}\geq{}$2 ${{\mathit \ell}}$)
$<56$ 95 19
KHACHATRYAN
2014Q
 CMS ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ ( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ or leptons)
1  AAD 2024AU based on 140 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The processes considered include both the associated production of a single top quark with a Higgs boson and the decay ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ in ${{\mathit t}}{{\overline{\mathit t}}}$ production using five Higgs decay modes.
2  HAYRAPETYAN 2025AD based on 138 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Events with ${{\mathit t}}$ and ${{\mathit H}}$ are considered, which are produced via ${{\mathit t}}{{\overline{\mathit t}}}$ or single-${{\mathit t}}$ productions and anomalous ${{\mathit H}}{{\mathit c}}{{\mathit t}}$ couplings.
3  AAD 2024AU based on 140 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The processes considered include both the associated production of a single top quark with a Higgs boson and the decay ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ in ${{\mathit t}}{{\overline{\mathit t}}}$ production using three Higgs decay modes.
4  AAD 2023CJ based on 139 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The processes considered include both the associated production of a single top quark with a Higgs boson and the decay ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ in ${{\mathit t}}{{\overline{\mathit t}}}$ production using ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$. Limits on the SMEFT Wilson coefficients are derived.
5  AAD 2023CJ based on 139 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The results are combined with searches in the ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$, ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$, and ${{\mathit H}}$ $\rightarrow$ ${{\mathit \tau}}{{\mathit \tau}}$ final states. Limits on the SMEFT Wilson coefficients are also derived.
6  AAD 2023H based on 139 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Uses events with one or two hadronically decaying ${{\mathit \tau}}$ and multiple jets. The limit corresponds to ($4.8$ ${}^{+2.2}_{-1.4}$) $ \times 10^{-4}$ measurement.
7  TUMASYAN 2022A based on 137 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The processes considered include both the associated production of a single top quark with a Higgs boson and the decay ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ in ${{\mathit t}}{{\overline{\mathit t}}}$ production using ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$.
8  TUMASYAN 2022K based on 137 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Uses events with one isolated lepton and multiple jets (including ${}\geq{}$ 2${{\mathit b}}$-jets). Deep neural networks are used for kinematical event reconstruction.
9  AABOUD 2019S based on 36.1 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. The searches using ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\mathit b}}$ and ${{\mathit H}}$ $\rightarrow$ ${{\mathit \tau}_{{{h}}}}{{\mathit \tau}_{{{h}}}}$ are combined with searches in diphoton and multilepton final states. The upper limit on the Yukawa coupling $\vert {{\mathit Y}_{{{tcH}}}}\vert $ $<$ 0.064 (95$\%$ CL) is obtained.
10  AABOUD 2019S based on 36.1 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Uses events with one isolated lepton and multiple jets (several of them ${{\mathit b}}$-tagged with high purity). A multivariate analysis is performed to distinguish the signal from backgrounds.
11  AABOUD 2019S based on 36.1 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Uses events with one or two hadronically decaying ${{\mathit \tau}}$ and multiple jets. A multivariate analysis is performed to distinguish the signal from backgrounds.
12  AABOUD 2018X based on 36.1 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. ${{\mathit \ell}}{{\mathit \ell}}$(same sign) +${}\geq{}$4j mode and ${{\mathit \ell}}{{\mathit \ell}}{{\mathit \ell}}$ +${}\geq{}$2j mode are targeted and specialized boosted decision trees are used to distinguish signals from backgrounds.
13  SIRUNYAN 2018BC based on 35.9 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Two channels ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\mathit H}}$ and ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$ in final states with one isolated lepton and $>$=3 jets with $>$=2 b jets are considered assuming a single ${{\mathit t}}{{\mathit H}}{{\mathit c}}$ FCNC coupling. Reconstructed kinematical variables are fed into a multivariate analysis and no significant deviation is observed from the predicted background.
14  AABOUD 2017AV based on 36.1 fb${}^{-1}$ at $\sqrt {s }$ = 13 TeV of ${{\mathit p}}{{\mathit p}}$ data. Search for ${{\mathit t}}{{\overline{\mathit t}}}$ events, where the other top quark decays hadronically or semi-leptonically. The upper bound on the ${{\mathit H}}-{{\mathit t}}-{{\mathit c}}$ Yukawa couplings is 0.090 (95$\%$ CL).
15  KHACHATRYAN 2017I based on 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV, using the topologies ${{\mathit t}}$ ${{\overline{\mathit t}}}$ $\rightarrow$ ${{\mathit H}}{{\mathit q}}+{{\mathit W}}{{\mathit b}}$, where ${{\mathit q}}={{\mathit u}}$, ${{\mathit c}}$.
16  AAD 2015CO based on 20.3 fb${}^{-1}$ at $\sqrt {s }$ = 8 TeV of ${{\mathit p}}{{\mathit p}}$ data. Searches for ${{\mathit t}}{{\overline{\mathit t}}}$ events, where the other top quark decays semi-leptonically. Exploits high multiplicity of ${{\mathit b}}$-jets and uses a likelihood discriminant. Combining with other ATLAS searches for different Higgs decay modes, B( ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$) $<$ 0.46$\%$ and B( ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit u}}$) $<$ 0.45$\%$ are obtained.
17  AAD 2014AA based on 4.7 fb${}^{-1}$ at $\sqrt {s }$ = 7 TeV and 20.3 fb${}^{-1}$ at $\sqrt {s }$ = 8 TeV of ${{\mathit p}}{{\mathit p}}$ data. The upper-bound is for the sum of Br( ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$) and Br( ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit u}}$). Search for ${{\mathit t}}{{\overline{\mathit t}}}$ events, where the other top quark decays hadronically or semi-leptonically. The upper bound constrains the ${{\mathit H}}-{{\mathit t}}-{{\mathit c}}$ Yukawa couplings $\sqrt { \vert  {{\mathit Y}}{}^{H}_{{{\mathit t}} {{\mathit c}_{{{L}}}}} \vert ^2 + \vert  {{\mathit Y}}{}^{H}_{{{\mathit t}} {{\mathit c}_{{{R}}}}} \vert ^2 }$ $<$ 0.17 (95$\%$ CL).
18  Based on 19.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. Search for final states with 3 or more isolated high $\mathit E_{T}$ charged leptons (${{\mathit \ell}}$ = ${{\mathit e}}$, ${{\mathit \mu}}$) bounds the ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit c}}$ decay in ${{\mathit t}}{{\overline{\mathit t}}}$ events when ${{\mathit H}}$ decays contain a pair of leptons. The upper bound constrains the ${{\mathit H}}-{{\mathit t}}-{{\mathit c}}$ Yukawa couplings $\sqrt { \vert  {{\mathit Y}}{}^{H}_{{{\mathit t}} {{\mathit c}_{{{L}}}}} \vert ^2 + \vert  {{\mathit Y}}{}^{H}_{{{\mathit t}} {{\mathit c}_{{{R}}}}} \vert ^2 }$ $<$ 0.21 (95$\%$ CL).
19  KHACHATRYAN 2014Q based on 19.5 fb${}^{-1}$ at $\sqrt {s }$ = 8 TeV of ${{\mathit p}}{{\mathit p}}$ data. Search for final states with ${}\geq{}$3 isolated charged leptons or with a photon pair accompanied by ${}\geq{}$1 lepton(s).
  References:
HAYRAPETYAN 2025AD
PR D112 032008 Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV
AAD 2024AU
EPJ C84 757 Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV $pp$ collisions with the ATLAS detector
AAD 2023CJ
JHEP 2312 195 Search for flavor-changing neutral $tqH$ interactions with $H\rightarrow \gamma\gamma$ in $pp$ collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
AAD 2023H
JHEP 2306 155 Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of $\tau$-leptons in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
TUMASYAN 2022A
PRL 129 032001 Search for Flavor-Changing Neutral Current Interactions of the Top Quark and Higgs Boson in Final States with Two Photons in Proton-Proton Collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$
TUMASYAN 2022K
JHEP 2202 169 Search for flavor-changing neutral current interactions of the top quark and the Higgs boson decaying to a bottom quark-antiquark pair at $ \sqrt{s} $ = 13 TeV
AABOUD 2019S
JHEP 1905 123 Search for top-quark decays $t \to Hq$ with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
AABOUD 2018X
PR D98 032002 Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector
SIRUNYAN 2018BC
JHEP 1806 102 Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at $\sqrt{s}=$ 13 TeV
AABOUD 2017AV
JHEP 1710 129 Search for Top Quark Decays ${{\mathit t}}$ $\rightarrow$ ${{\mathit q}}{{\mathit H}}$, with ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$, in $\sqrt {s }$ = 13 TeV ${{\mathit p}}{{\mathit p}}$ Collisions using the ATLAS Detector
KHACHATRYAN 2017I
JHEP 1702 079 Search for top Quark Decays via Higgs-Boson-Mediated Flavor-Changing Neutral Currents in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
AAD 2015CO
JHEP 1512 061 Search for Flavour-Changing Neutral Current Top Quark Decays ${{\mathit t}}$ $\rightarrow$ ${{\mathit H}}{{\mathit q}}$ in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
AAD 2014AA
JHEP 1406 008 Search for top Quark Decays ${{\mathit t}}$ $\rightarrow$ ${{\mathit q}}{{\mathit H}}$ with ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ using the ATLAS Detector
CHATRCHYAN 2014R
PR D90 032006 Search for Anomalous Production of Events with Three or More Leptons in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV
KHACHATRYAN 2014Q
PR D90 112013 Searches for Heavy Higgs Bosons in Two-Higgs-Doublet Models and for t $\rightarrow$ ch Decay using Multilepton and Diphoton Final States in ${{\mathit p}}{{\mathit p}}$ Collisions at 8 TeV