Abstract (data abstract)

A search for a new pseudoscalar boson produced in events with top quark pairs where the

a

boson decays to a pair of muons is performed using

p p

collision data at the LHC collected by the ATLAS detector at

\sqrt{s} = 13

TeV corresponding to an integrated luminosity of

139 {fb}^{- 1}

. This search targets the final state where only one top quark decay yields an electron or muon, resulting in a signature with three leptons

e μ μ

and

μ μ μ

. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models,

p p \to t \bar{t} a

and

p p \to t \bar{t}

with

t \to H^{\pm} b

H^{\pm} \to W^{\pm} a

, where

a \to μ μ

, in the mass ranges

15

GeV

< m_{a} < 72

GeV and

120

GeV

\leq m_{H^{\pm}} \leq 160

GeV.

Table 1

Data from Figure 2a

10.17182/hepdata.139987.v1/t1

Comparison between data and expected background for the on- $Z$ -boson control region in the $e μ μ$ final state. The bins correspond to...
Table 2

Data from Figure 2b

10.17182/hepdata.139987.v1/t2

Comparison between data and expected background for the on- $Z$ boson control region in the $μ μ μ$ final state. The bins correspond to...
Table 3

Data from Figure 3a

10.17182/hepdata.139987.v1/t3

Di-muon mass distribution for the $e μ μ$ signal region for data and expected background. The expected signal distribution for $m_a =...
Table 4

Data from Figure 3b

10.17182/hepdata.139987.v1/t4

Di-muon mass distribution for the $μ μ μ$ signal region for data and expected background. The expected signal distribution for $m_a =...
Table 5

Data from Figure 4a

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Fit of the Double Crystal Ball width as a function of the $a$ -boson mass in the $e μ μ$ channel.
Table 6

Data from Figure 5a

10.17182/hepdata.139987.v1/t6

Expected and observed 95% CL upper limit on signal cross section as a function of $m_{a}$ for $t \bar{t} a$ .
Table 7

Data from Figure 5b

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Expected and observed 95% CL upper limit on signal cross section as a function of $m_{a}$ for $H^{+} \to a W$ , considering...
Table 8

Data from Figure 5c

10.17182/hepdata.139987.v1/t8

Expected and observed 95% CL upper limit on signal cross section as a function of $m_{a}$ for $H^{+} \to a W$ , considering...
Table 9

Data from Figure 5d

10.17182/hepdata.139987.v1/t9

Expected and observed 95% CL upper limit on signal cross section as a function of $m_{a}$ for $H^{+} \to a W$ , considering...
Table 10

Data from Auxiliary Figure 1

10.17182/hepdata.139987.v1/t10

Comparison of the expected background with data in a region dominated by non-prompt background. The region is defined exactly like...
Table 11

Data from Auxiliary Figure 2(a)

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Scan of the observed p-value as a function of $m_{a}$ for the background-only hypothesis.
Table 12

Data from Auxiliary Figure 2(b)

10.17182/hepdata.139987.v1/t12

Scan of the observed p-value as a function of $m_{a}$ for the background-only hypothesis for $e μ μ$ channel.
Table 13

Data from Auxiliary Figure 2(c)

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Scan of the observed p-value as a function of $m_{a}$ for the background-only hypothesis for $μ μ μ$ channel.
Table 14

Data from Auxiliary Figure 3

10.17182/hepdata.139987.v1/t14

Acceptance times efficiency for the $t \bar{t} a$ , $a \to μ μ$ signal as a function of the $m_{a}$ hypothesis.
Table 15

Data from Auxiliary Figure 4(a)

10.17182/hepdata.139987.v1/t15

Acceptance times efficiency for the $t \to b H^{+}$ , $H^{+} \to W^{+} a$ , $a \to μ μ$ signal as a function of the...
Table 16

Data from Auxiliary Figure 4(b)

10.17182/hepdata.139987.v1/t16

Acceptance times efficiency for the $t \to b H^{+}$ , $H^{+} \to W^{+} a$ , $a \to μ μ$ signal as a function of...
Table 17

Data from Auxiliary Figure 5(a)

10.17182/hepdata.139987.v1/t17

Expected lower limits on $\tan β$ for the $t \to H^{+} b, H^{+} \to a W, a \to μ μ$ signal in the context of the 2HDM as...
Table 18

Data from Auxiliary Figure 5(b)

10.17182/hepdata.139987.v1/t18

Observed lower limits on $\tan β$ for the $t \to H^{+} b, H^{+} \to a W, a \to μ μ$ signal in the context of the 2HDM as...
Table 19

Data from Auxiliary Table 01

10.17182/hepdata.139987.v1/t19

Cutflow for two signal mass points for $t \bar{t} a$ , $m_{a} = 20$ GeV and $m_{a} = 60$ GeV, and one signal...
Table 20

Data from Auxiliary Table 02

10.17182/hepdata.139987.v1/t20

Cutflow for the dominant backgrounds estimated from simulation ( $t \bar{t} Z$ , $W Z$ , $t \bar{t} H$ ) and data, for the electron channel $e μ μ$ . The yields...
Table 21

Data from Auxiliary Table 03

10.17182/hepdata.139987.v1/t21

Cutflow for the signal mass point $t \bar{t} a$ , $m_{a} = 20$ GeV, as well as the dominant backgrounds estimated from simulation...
Table 22

Data from Auxiliary Table 04

10.17182/hepdata.139987.v1/t22

Cutflow for the signal mass point $t \bar{t} a$ , $m_{a} = 60$ GeV, as well as the dominant backgrounds estimated from simulation...
Table 23

Data from Auxiliary Table 05

10.17182/hepdata.139987.v1/t23

Cutflow for $H^{+} \to W a$ with $m_{H^{+}} = 120$ GeV, $m_{a} = 30$ GeV for the muon channel $μ μ μ$ ....
Table 24

Data from Auxiliary Table 06

10.17182/hepdata.139987.v1/t24

Total yields in the $e μ μ$ and $μ μ μ$ signal regions for the expected background and data after the profile likelihood fit...

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