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 $pp$ collision data at the LHC collected by the ATLAS detector at $\sqrt{s} = 13$ TeV corresponding to an integrated luminosity of $139~\mathrm{fb}^{-1}$. This search targets the final state where only one top quark decay yields an electron or muon, resulting in a signature with three leptons $e\mu\mu$ and $\mu\mu\mu$. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models, $pp \rightarrow t\bar{t}a$ and $pp \rightarrow t\bar{t}$ with $t \rightarrow H^\pm b$, $H^\pm \rightarrow W^\pm a$, where $a\rightarrow\mu\mu$, 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 $e\mu\mu$ 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 $\mu\mu\mu$ final state. The bins correspond to...
Table 3

Data from Figure 3a

10.17182/hepdata.139987.v1/t3

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

Data from Figure 4a

10.17182/hepdata.139987.v1/t5

Fit of the Double Crystal Ball width as a function of the $a$-boson mass in the $e\mu\mu$ 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

10.17182/hepdata.139987.v1/t7

Expected and observed 95% CL upper limit on signal cross section as a function of $m_a$ for $H^{+}\rightarrow aW$, 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 $H^{+}\rightarrow aW$, 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 $H^{+}\rightarrow aW$, 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)

10.17182/hepdata.139987.v1/t11

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 $e\mu\mu$ channel.
Table 13

Data from Auxiliary Figure 2(c)

10.17182/hepdata.139987.v1/t13

Scan of the observed p-value as a function of $m_a$ for the background-only hypothesis for $\mu\mu\mu$ channel.
Table 14

Data from Auxiliary Figure 3

10.17182/hepdata.139987.v1/t14

Acceptance times efficiency for the $t\bar{t}a$, $a\rightarrow \mu\mu$ 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 $t \rightarrow bH^+$, $H^+ \rightarrow W^+ a$, $a\rightarrow \mu\mu$ 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 \rightarrow bH^+ $, $H^+ \rightarrow W^+ a$, $a\rightarrow \mu\mu$ signal as a function of...
Table 17

Data from Auxiliary Figure 5(a)

10.17182/hepdata.139987.v1/t17

Expected lower limits on $\tan\beta$ for the $t\rightarrow H^{+}b, H^{+}\rightarrow aW, a\rightarrow\mu\mu$ 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 $\tan\beta$ for the $t\rightarrow H^{+}b, H^{+}\rightarrow aW, a\rightarrow\mu\mu$ 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 ($t\bar{t}Z$, $WZ$, $t\bar{t}H$) and data, for the electron channel $e\mu\mu$. 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 $H^+ \rightarrow W a$ with $m_{H^{+}} = 120$ GeV, $m_{a} = 30$ GeV for the muon channel $\mu\mu\mu$....
Table 24

Data from Auxiliary Table 06

10.17182/hepdata.139987.v1/t24

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

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

Table 13

Table 14

Table 15

Table 16

Table 17

Table 18

Table 19

Table 20

Table 21

Table 22

Table 23

Table 24

JSON

YAML

YODA

YODA1

ROOT

CSV

Visualize

Ask a Question