Abstract (data abstract)

- CERN-LHC. A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (

q = u, c

) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two

W

bosons, two

Z

bosons or a

τ^{+} τ^{-}

pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are

t \bar{t}

and

H t

production. For the

t \bar{t}

production, one top quark decays via

t \to H q

. The proton-proton collision data set analysed amounts to 140 fb

^{- 1}

\sqrt{s} = 13

TeV. No significant excess beyond Standard Model expectations is observed and upper limits are set on the

t \to H q

branching ratios at 95\,\% confidence level, amounting to observed (expected) limits of

B (t \to H u) < 2.8 (3.0) \times 10^{- 4}

and

B (t \to H c) < 3.3 (3.8) \times 10^{- 4}

. Combining this search with other searches for

t H q

flavour-changing neutral-current interactions previously conducted by ATLAS, considering

H \to b \bar{b}

and

H \to γ γ

decays, as well as

H \to τ^{+} τ^{-}

decays with one or two hadronically decaying

τ

-leptons, yields observed (expected) upper limits on the branching ratios of

B (t \to H u) < 2.6 (1.8) \times 10^{- 4}

and

B (t \to H c) < 3.4 (2.3) \times 10^{- 4}

SR $2 ℓ$ Dec pre-fit background composition

Figure 3 (a) in the paper

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Pre-fit background composition of the SR $2 ℓ$ Dec. The table shows the event yields as opposed to just the percentages of...
SR $2 ℓ$ Prod pre-fit background composition

Figure 3 (b) in the paper

10.17182/hepdata.150998.v1/t2

Pre-fit background composition of the SR $2 ℓ$ Prod. The table shows the event yields as opposed to just the percentages of...
SR $3 ℓ$ Dec pre-fit background composition

Figure 3 (c) in the paper

10.17182/hepdata.150998.v1/t3

Pre-fit background composition of the SR $3 ℓ$ Dec. The table shows the event yields as opposed to just the percentages of...
SR $3 ℓ$ Prod pre-fit background composition

Figure 3 (d) in the paper

10.17182/hepdata.150998.v1/t4

Pre-fit background composition of the SR $3 ℓ$ Prod. The table shows the event yields as opposed to just the percentages of...
SR $2 ℓ$ Dec $H_{T} (jets)$ post-fit

Figure 6 (a) in the paper

10.17182/hepdata.150998.v1/t5

Post-fit plot of $H_{T} (jets)$ in the SR $2 ℓ$ Dec from a signal-blinded background-only fit.
SR $2 ℓ$ Prod $m (t_{SM}, b {-jet}_{0})$ post-fit

Figure 6 (b) in the paper

10.17182/hepdata.150998.v1/t6

Post-fit plot of $m (t_{SM}, b {-jet}_{0})$ in the SR $2 ℓ$ Prod from a signal-blinded background-only fit.
SR $3 ℓ$ Dec $m (ℓ_{OS}, ℓ_{SS,1})$ post-fit

Figure 6 (c) in the paper

10.17182/hepdata.150998.v1/t7

Post-fit plot of $m (ℓ_{OS}, ℓ_{SS,1})$ in the SR $3 ℓ$ Dec from a signal-blinded background-only fit.
SR $3 ℓ$ Prod $m (ℓ_{OS}, ℓ_{SS,1})$ post-fit

Figure 6 (d) in the paper

10.17182/hepdata.150998.v1/t8

Post-fit plot of $m (ℓ_{OS}, ℓ_{SS,1})$ in the SR $3 ℓ$ Prod from a signal-blinded background-only fit.
SR $2 ℓ$ Dec $D_{NN} (t H c)$ post-fit

Figure 7 (a) in the paper

10.17182/hepdata.150998.v1/t9

Post-fit plot of $D_{NN} (t H c)$ in the SR $2 ℓ$ Dec from the full fit to data.
SR $2 ℓ$ Prod $D_{NN} (t H c)$ post-fit

Figure 7 (b) in the paper

10.17182/hepdata.150998.v1/t10

Post-fit plot of $D_{NN} (t H c)$ in the SR $2 ℓ$ Prod from the full fit to data.
SR $3 ℓ$ Dec $D_{NN} (t H c)$ post-fit

Figure 7 (c) in the paper

10.17182/hepdata.150998.v1/t11

Post-fit plot of $D_{NN} (t H c)$ in the SR $3 ℓ$ Dec from the full fit to data.
SR $3 ℓ$ Prod $D_{NN} (t H c)$ post-fit

Figure 7 (d) in the paper

10.17182/hepdata.150998.v1/t12

Post-fit plot of $D_{NN} (t H c)$ in the SR $3 ℓ$ Prod from the full fit to data.
CR $2 ℓ$ HF $e$ $p_{T} (ℓ_{1})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t13

Post-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ HF $e$ from the full fit to data.
CR $2 ℓ$ HF $μ$ $p_{T} (ℓ_{1})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t14

Post-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ HF $μ$ from the full fit to data.
CR $2 ℓ$ $t \bar{t} V$ $p_{T} (ℓ_{1})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t15

Post-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ $t \bar{t} V$ from the full fit to data.
CR $3 ℓ$ HF $e$ $p_{T} (ℓ_{2})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t16

Post-fit plot of $p_{T} (ℓ_{2})$ in the CR $3 ℓ$ HF $e$ from the full fit to data.
CR $3 ℓ$ HF $μ$ $p_{T} (ℓ_{2})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t17

Post-fit plot of $p_{T} (ℓ_{2})$ in the CR $3 ℓ$ HF $μ$ from the full fit to data.
CR $3 ℓ$ $t \bar{t} W$ $p_{T} (b {-jet}_{0})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t18

Post-fit plot of $p_{T} (b {-jet}_{0})$ in the CR $3 ℓ$ $t \bar{t} W$ from the full fit to data.
CR $3 ℓ$ $t \bar{t} Z$ $p_{T} (b {-jet}_{0})$ post-fit

Figure 8 in the paper

10.17182/hepdata.150998.v1/t19

Post-fit plot of $p_{T} (b {-jet}_{0})$ in the CR $3 ℓ$ $t \bar{t} Z$ from the full fit to data.
Upper limits on $B (t \to H u)$

Figure 9 (a) in the paper

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Observed and expected upper exclusion limits on the branching ratio $B (t \to H u)$ for different analyses and their statistical combination.
Upper limits on $B (t \to H c)$

Figure 9 (b) in the paper

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Observed and expected upper exclusion limits on the branching ratio $B (t \to H c)$ for different analyses and their statistical combination.
Table 6

Table 6 in the paper

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Post-fit normalisation factors of free-floating background processes and the signal normalisation.
Table 7

Table 7 in the paper

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Post-fit predicted and observed yields in all $2 ℓ$ SS signal and control regions. Pre-fit signal contributions for a signal cross section...
Table 8

Table 8 in the paper

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Post-fit predicted and observed yields in all $3 ℓ$ signal and control regions. Pre-fit signal contributions for a signal cross section...
Table 9

Table 9 in the paper

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Expected upper limits on $B (t \to H q)$ for the nominal fit and alternative fit configurations. One contains the full phase space...
Table 10

Table 10 in the paper

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Expected and observed upper limits on $B (t \to H q)$ and $| C_{u ϕ}^{q t, t q} |$ for the full fit containing all systematic uncertainties.
SR $2 ℓ$ Dec $H_{T} (jets)$ pre-fit

Figure 2 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t27

Pre-fit plot of $H_{T} (jets)$ in the SR $2 ℓ$ Dec from a signal-blinded background-only fit.
SR $2 ℓ$ Prod $m (t_{SM}, b {-jet}_{0})$ pre-fit

Figure 2 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t28

Pre-fit plot of $m (t_{SM}, b {-jet}_{0})$ in the SR $2 ℓ$ Prod from a signal-blinded background-only fit.
SR $3 ℓ$ Dec $m (ℓ_{OS}, ℓ_{SS,1})$ pre-fit

Figure 2 (c) in the auxiliary material

10.17182/hepdata.150998.v1/t29

Pre-fit plot of $m (ℓ_{OS}, ℓ_{SS,1})$ in the SR $3 ℓ$ Dec from a signal-blinded background-only fit.
SR $3 ℓ$ Prod $m (ℓ_{OS}, ℓ_{SS,1})$ pre-fit

Figure 2 (d) in the auxiliary material

10.17182/hepdata.150998.v1/t30

Pre-fit plot of $m (ℓ_{OS}, ℓ_{SS,1})$ in the SR $3 ℓ$ Prod from a signal-blinded background-only fit.
SR $2 ℓ$ Dec $D_{NN} (t H u)$ post-fit

Figure 3 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t31

Post-fit plot of $D_{NN} (t H u)$ in the SR $2 ℓ$ Dec from the full fit to data.
SR $2 ℓ$ Prod $D_{NN} (t H u)$ post-fit

Figure 3 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t32

Post-fit plot of $D_{NN} (t H u)$ in the SR $2 ℓ$ Prod from the full fit to data.
SR $3 ℓ$ Dec $D_{NN} (t H u)$ post-fit

Figure 3 (c) in the auxiliary material

10.17182/hepdata.150998.v1/t33

Post-fit plot of $D_{NN} (t H u)$ in the SR $3 ℓ$ Dec from the full fit to data.
SR $3 ℓ$ Prod $D_{NN} (t H u)$ post-fit

Figure 3 (d) in the auxiliary material

10.17182/hepdata.150998.v1/t34

Post-fit plot of $D_{NN} (t H u)$ in the SR $3 ℓ$ Prod from the full fit to data.
SR $2 ℓ$ Dec $D_{NN} (t H c)$ pre-fit

Figure 4 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t35

Pre-fit plot of $D_{NN} (t H c)$ in the SR $2 ℓ$ Dec from the full fit to data.
SR $2 ℓ$ Prod $D_{NN} (t H c)$ pre-fit

Figure 4 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t36

Pre-fit plot of $D_{NN} (t H c)$ in the SR $2 ℓ$ Prod from the full fit to data.
SR $3 ℓ$ Dec $D_{NN} (t H c)$ pre-fit

Figure 4 (c) in the auxiliary material

10.17182/hepdata.150998.v1/t37

Pre-fit plot of $D_{NN} (t H c)$ in the SR $3 ℓ$ Dec from the full fit to data.
SR $3 ℓ$ Prod $D_{NN} (t H c)$ pre-fit

Figure 4 (d) in the auxiliary material

10.17182/hepdata.150998.v1/t38

Pre-fit plot of $D_{NN} (t H c)$ in the SR $3 ℓ$ Prod from the full fit to data.
SR $2 ℓ$ Dec $D_{NN} (t H u)$ pre-fit

Figure 6 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t39

Pre-fit plot of $D_{NN} (t H u)$ in the SR $2 ℓ$ Dec from the full fit to data.
SR $2 ℓ$ Prod $D_{NN} (t H u)$ pre-fit

Figure 6 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t40

Pre-fit plot of $D_{NN} (t H u)$ in the SR $2 ℓ$ Prod from the full fit to data.
SR $3 ℓ$ Dec $D_{NN} (t H u)$ pre-fit

Figure 6 (c) in the auxiliary material

10.17182/hepdata.150998.v1/t41

Pre-fit plot of $D_{NN} (t H u)$ in the SR $3 ℓ$ Dec from the full fit to data.
SR $3 ℓ$ Prod $D_{NN} (t H u)$ pre-fit

Figure 6 (d) in the auxiliary material

10.17182/hepdata.150998.v1/t42

Pre-fit plot of $D_{NN} (t H u)$ in the SR $3 ℓ$ Prod from the full fit to data.
CR $2 ℓ$ HF $e$ $p_{T} (ℓ_{1})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t43

Pre-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ HF $e$ from the full fit to data.
CR $2 ℓ$ HF $μ$ $p_{T} (ℓ_{1})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t44

Pre-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ HF $μ$ from the full fit to data.
CR $2 ℓ$ $t \bar{t} V$ $p_{T} (ℓ_{1})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t45

Pre-fit plot of $p_{T} (ℓ_{1})$ in the CR $2 ℓ$ $t \bar{t} V$ from the full fit to data.
CR $3 ℓ$ HF $e$ $p_{T} (ℓ_{2})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t46

Pre-fit plot of $p_{T} (ℓ_{2})$ in the CR $3 ℓ$ HF $e$ from the full fit to data.
CR $3 ℓ$ HF $μ$ $p_{T} (ℓ_{2})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t47

Pre-fit plot of $p_{T} (ℓ_{2})$ in the CR $3 ℓ$ HF $μ$ from the full fit to data.
CR $3 ℓ$ $t \bar{t} W$ $p_{T} (b {-jet}_{0})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t48

Pre-fit plot of $p_{T} (b {-jet}_{0})$ in the CR $3 ℓ$ $t \bar{t} W$ from the full fit to data.
CR $3 ℓ$ $t \bar{t} Z$ $p_{T} (b {-jet}_{0})$ pre-fit

Figure 8 in the auxiliary material

10.17182/hepdata.150998.v1/t49

Pre-fit plot of $p_{T} (b {-jet}_{0})$ in the CR $3 ℓ$ $t \bar{t} Z$ from the full fit to data.
$t H u$ fit NP ranking

Figure 10 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t50

Ranking of fit nuisance parameters according to their impact on the post-fit $t H u$ signal normalisation when fixed to $\pm 1 σ$
$t H c$ fit NP ranking

Figure 10 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t51

Ranking of fit nuisance parameters according to their impact on the post-fit $t H c$ signal normalisation when fixed to $\pm 1 σ$
Upper limits on $B (t \to H u)$ per final state

Figure 12 (a) in the auxiliary material

10.17182/hepdata.150998.v1/t52

Expected upper exclusion limits on the branching ratio $B (t \to H u)$ for each individual final state and the full analysis.
Upper limits on $B (t \to H c)$ per final state

Figure 12 (b) in the auxiliary material

10.17182/hepdata.150998.v1/t53

Expected upper exclusion limits on the branching ratio $B (t \to H c)$ for each individual final state and the full analysis.

SR2ℓ Dec pre-fit background composition

SR2ℓ Prod pre-fit background composition

SR3ℓ Dec pre-fit background composition

SR3ℓ Prod pre-fit background composition

SR2ℓ Dec HT(jets) post-fit

SR2ℓ Prod m(tSM,b-jet0) post-fit

SR3ℓ Dec m(ℓOS,ℓSS,1) post-fit

SR3ℓ Prod m(ℓOS,ℓSS,1) post-fit

SR2ℓ Dec DNN(tHc) post-fit

SR2ℓ Prod DNN(tHc) post-fit

SR3ℓ Dec DNN(tHc) post-fit

SR3ℓ Prod DNN(tHc) post-fit

CR2ℓ HFe pT(ℓ1) post-fit

CR2ℓ HFμ pT(ℓ1) post-fit

CR2ℓ tt¯V pT(ℓ1) post-fit

CR3ℓ HFe pT(ℓ2) post-fit

CR3ℓ HFμ pT(ℓ2) post-fit

CR3ℓ tt¯W pT(b-jet0) post-fit

CR3ℓ tt¯Z pT(b-jet0) post-fit

Upper limits on B(t→Hu)

Upper limits on B(t→Hc)

Table 6

Table 7

Table 8

Table 9

Table 10

SR2ℓ Dec HT(jets) pre-fit

SR2ℓ Prod m(tSM,b-jet0) pre-fit

SR3ℓ Dec m(ℓOS,ℓSS,1) pre-fit

SR3ℓ Prod m(ℓOS,ℓSS,1) pre-fit

SR2ℓ Dec DNN(tHu) post-fit

SR2ℓ Prod DNN(tHu) post-fit

SR3ℓ Dec DNN(tHu) post-fit

SR3ℓ Prod DNN(tHu) post-fit

SR2ℓ Dec DNN(tHc) pre-fit

SR2ℓ Prod DNN(tHc) pre-fit

SR3ℓ Dec DNN(tHc) pre-fit

SR3ℓ Prod DNN(tHc) pre-fit

SR2ℓ Dec DNN(tHu) pre-fit

SR2ℓ Prod DNN(tHu) pre-fit

SR3ℓ Dec DNN(tHu) pre-fit

SR3ℓ Prod DNN(tHu) pre-fit

CR2ℓ HFe pT(ℓ1) pre-fit

CR2ℓ HFμ pT(ℓ1) pre-fit

CR2ℓ tt¯V pT(ℓ1) pre-fit

CR3ℓ HFe pT(ℓ2) pre-fit

CR3ℓ HFμ pT(ℓ2) pre-fit

CR3ℓ tt¯W pT(b-jet0) pre-fit

CR3ℓ tt¯Z pT(b-jet0) pre-fit

tHu fit NP ranking

tHc fit NP ranking

Upper limits on B(t→Hu) per final state

Upper limits on B(t→Hc) per final state

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SR $2 ℓ$ Dec pre-fit background composition

SR $2 ℓ$ Prod pre-fit background composition

SR $3 ℓ$ Dec pre-fit background composition

SR $3 ℓ$ Prod pre-fit background composition

SR $2 ℓ$ Dec $H_{T} (jets)$ post-fit

SR $2 ℓ$ Prod $m (t_{SM}, b {-jet}_{0})$ post-fit

SR $3 ℓ$ Dec $m (ℓ_{OS}, ℓ_{SS,1})$ post-fit

SR $3 ℓ$ Prod $m (ℓ_{OS}, ℓ_{SS,1})$ post-fit

SR $2 ℓ$ Dec $D_{NN} (t H c)$ post-fit

SR $2 ℓ$ Prod $D_{NN} (t H c)$ post-fit

SR $3 ℓ$ Dec $D_{NN} (t H c)$ post-fit

SR $3 ℓ$ Prod $D_{NN} (t H c)$ post-fit

CR $2 ℓ$ HF $e$ $p_{T} (ℓ_{1})$ post-fit

CR $2 ℓ$ HF $μ$ $p_{T} (ℓ_{1})$ post-fit

CR $2 ℓ$ $t \bar{t} V$ $p_{T} (ℓ_{1})$ post-fit

CR $3 ℓ$ HF $e$ $p_{T} (ℓ_{2})$ post-fit

CR $3 ℓ$ HF $μ$ $p_{T} (ℓ_{2})$ post-fit

CR $3 ℓ$ $t \bar{t} W$ $p_{T} (b {-jet}_{0})$ post-fit

CR $3 ℓ$ $t \bar{t} Z$ $p_{T} (b {-jet}_{0})$ post-fit

Upper limits on $B (t \to H u)$

Upper limits on $B (t \to H c)$

SR $2 ℓ$ Dec $H_{T} (jets)$ pre-fit

SR $2 ℓ$ Prod $m (t_{SM}, b {-jet}_{0})$ pre-fit

SR $3 ℓ$ Dec $m (ℓ_{OS}, ℓ_{SS,1})$ pre-fit

SR $3 ℓ$ Prod $m (ℓ_{OS}, ℓ_{SS,1})$ pre-fit

SR $2 ℓ$ Dec $D_{NN} (t H u)$ post-fit

SR $2 ℓ$ Prod $D_{NN} (t H u)$ post-fit

SR $3 ℓ$ Dec $D_{NN} (t H u)$ post-fit

SR $3 ℓ$ Prod $D_{NN} (t H u)$ post-fit

SR $2 ℓ$ Dec $D_{NN} (t H c)$ pre-fit

SR $2 ℓ$ Prod $D_{NN} (t H c)$ pre-fit

SR $3 ℓ$ Dec $D_{NN} (t H c)$ pre-fit

SR $3 ℓ$ Prod $D_{NN} (t H c)$ pre-fit

SR $2 ℓ$ Dec $D_{NN} (t H u)$ pre-fit

SR $2 ℓ$ Prod $D_{NN} (t H u)$ pre-fit

SR $3 ℓ$ Dec $D_{NN} (t H u)$ pre-fit

SR $3 ℓ$ Prod $D_{NN} (t H u)$ pre-fit

CR $2 ℓ$ HF $e$ $p_{T} (ℓ_{1})$ pre-fit

CR $2 ℓ$ HF $μ$ $p_{T} (ℓ_{1})$ pre-fit

CR $2 ℓ$ $t \bar{t} V$ $p_{T} (ℓ_{1})$ pre-fit

CR $3 ℓ$ HF $e$ $p_{T} (ℓ_{2})$ pre-fit

CR $3 ℓ$ HF $μ$ $p_{T} (ℓ_{2})$ pre-fit

CR $3 ℓ$ $t \bar{t} W$ $p_{T} (b {-jet}_{0})$ pre-fit

CR $3 ℓ$ $t \bar{t} Z$ $p_{T} (b {-jet}_{0})$ pre-fit

$t H u$ fit NP ranking

$t H c$ fit NP ranking

Upper limits on $B (t \to H u)$ per final state

Upper limits on $B (t \to H c)$ per final state

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