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Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS experiment

The collaboration
No Journal Information, 2019

Abstract (data abstract)
"Searches for scalar leptoquarks pair-produced in proton-proton collisions at $\sqrt{s}=13$~TeV at the Large Hadron Collider are performed by the ATLAS experiment. A dataset corresponding to an integrated luminosity of $36.1~\textrm{fb}^{-1}$ is used. Final states containing two same-flavour charged leptons (electrons or muons) and two or more jets are studied, as are states with one charged lepton, missing transverse momentum and two or more jets. No statistically significant excess above the standard model expectation is observed. The observed and expected lower limits on the leptoquark mass at 95% confidence level are around 1.25 TeV for first and second generation leptoquarks, as postulated in the minimal Buchmueller-Rueckl-Wyler model, assuming a branching ratio into a charged lepton and a quark of 50%. Measurements of particle-level inclusive and differential cross-sections are presented for the $Z \rightarrow ee$, $Z \rightarrow \mu\mu$ and $t\bar{t}$ processes in several regions which are related to the search control regions. The predictions from a range of generators are compared to the measurements, and a good agreement is seen for most of the observables. However, the predictions for the $Z \rightarrow ee$ and $Z \rightarrow \mu\mu$ measurements in observables which are sensitive to jet energies are observed to disagree with the data. The measurements could be used to improve the generator predictions in these and related regions."

• #### Inclusive cross-section measurements

Table 4

10.17182/hepdata.83968.v1/t1

Inclusive cross-section and uncertainty from each source, for the dominant process in the each measurement region.

• #### Meas. of leading $p_{T}^j$ in $eejj$

Figure 7

10.17182/hepdata.83968.v1/t2

Differential cross-section and uncertainty from each source, as a function of leading $p_{T}^j$ for the dominant process in the $eejj$...

• #### Meas. of leading $p_{T}^j$ in $\mu\mu jj$

Figure 7

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• #### Meas. of leading $p_{T}^j$ in extreme $eejj$

Figure 8

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Differential cross-section and uncertainty from each source, as a function of leading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of leading $p_{T}^j$ in extreme $\mu\mu jj$

Figure 8

10.17182/hepdata.83968.v1/t6

Differential cross-section and uncertainty from each source, as a function of leading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of leading $p_{T}^j$ in extreme $e\mu jj$

Figure 8

10.17182/hepdata.83968.v1/t7

Differential cross-section and uncertainty from each source, as a function of leading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of subleading $p_{T}^j$ in $eejj$

Figure 12

10.17182/hepdata.83968.v1/t8

Differential cross-section and uncertainty from each source, as a function of subleading $p_{T}^j$ for the dominant process in the $eejj$...

• #### Meas. of subleading $p_{T}^j$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t9

• #### Meas. of subleading $p_{T}^j$ in extreme $eejj$

Figure 15

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Differential cross-section and uncertainty from each source, as a function of subleading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of subleading $p_{T}^j$ in extreme $\mu\mu jj$

Figure 16

10.17182/hepdata.83968.v1/t12

Differential cross-section and uncertainty from each source, as a function of subleading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of subleading $p_{T}^j$ in extreme $e\mu jj$

Figure 17

10.17182/hepdata.83968.v1/t13

Differential cross-section and uncertainty from each source, as a function of subleading $p_{T}^j$ for the dominant process in the extreme...

• #### Meas. of $min\Delta\phi(j_0,l)$ in $eejj$

Figure 7

10.17182/hepdata.83968.v1/t14

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_0,l)$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $min\Delta\phi(j_0,l)$ in $\mu\mu jj$

Figure 7

10.17182/hepdata.83968.v1/t15

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_0,l)$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $min\Delta\phi(j_0,l)$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t16

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_0,l)$ for the dominant process in the $e\mu jj$...

• #### Meas. of $min\Delta\phi(j_0,l)$ in extreme $eejj$

Figure 8

10.17182/hepdata.83968.v1/t17

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_0,l)$ for the dominant process in the extreme $eejj$...

• #### Meas. of $min\Delta\phi(j_0,l)$ in extreme $\mu\mu jj$

Figure 8

10.17182/hepdata.83968.v1/t18

• #### Meas. of $min\Delta\phi(j_1,l)$ in $eejj$

Figure 12

10.17182/hepdata.83968.v1/t20

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_1,l)$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $min\Delta\phi(j_1,l)$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t21

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_1,l)$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $min\Delta\phi(j_1,l)$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t22

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_1,l)$ for the dominant process in the $e\mu jj$...

• #### Meas. of $min\Delta\phi(j_1,l)$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t23

Differential cross-section and uncertainty from each source, as a function of $min\Delta\phi(j_1,l)$ for the dominant process in the extreme $eejj$...

• #### Meas. of $min\Delta\phi(j_1,l)$ in extreme $\mu\mu jj$

Figure 16

10.17182/hepdata.83968.v1/t24

• #### Meas. of $\Delta\eta_{jj}$ in $eejj$

Figure 12

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Differential cross-section and uncertainty from each source, as a function of $\Delta\eta_{jj}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $\Delta\eta_{jj}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t27

Differential cross-section and uncertainty from each source, as a function of $\Delta\eta_{jj}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $\Delta\eta_{jj}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t28

Differential cross-section and uncertainty from each source, as a function of $\Delta\eta_{jj}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $\Delta\eta_{jj}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t29

Differential cross-section and uncertainty from each source, as a function of $\Delta\eta_{jj}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $\Delta\eta_{jj}$ in extreme $\mu\mu jj$

Figure 16

10.17182/hepdata.83968.v1/t30

• #### Meas. of $\Delta\phi_{jj}$ in $eejj$

Figure 12

10.17182/hepdata.83968.v1/t32

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{jj}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $\Delta\phi_{jj}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t33

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{jj}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $\Delta\phi_{jj}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t34

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{jj}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $\Delta\phi_{jj}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t35

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{jj}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $\Delta\phi_{jj}$ in extreme $\mu\mu jj$

Figure 16

10.17182/hepdata.83968.v1/t36

• #### Meas. of $\Delta\phi_{ll}$ in $eejj$

Figure 12

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Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{ll}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $\Delta\phi_{ll}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t39

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{ll}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $\Delta\phi_{ll}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t40

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{ll}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $\Delta\phi_{ll}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t41

Differential cross-section and uncertainty from each source, as a function of $\Delta\phi_{ll}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $\Delta\phi_{ll}$ in extreme $\mu\mu jj$

Figure 16

10.17182/hepdata.83968.v1/t42

• #### Meas. of $m_{jj}$ in $eejj$

Figure 12

10.17182/hepdata.83968.v1/t44

Differential cross-section and uncertainty from each source, as a function of $m_{jj}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $m_{jj}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t45

Differential cross-section and uncertainty from each source, as a function of $m_{jj}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $m_{jj}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t46

Differential cross-section and uncertainty from each source, as a function of $m_{jj}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $m_{jj}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t47

Differential cross-section and uncertainty from each source, as a function of $m_{jj}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $m_{jj}$ in extreme $\mu\mu jj$

Figure 16

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• #### Meas. of $p_{T}^{ee}$ in $eejj$

Figure 12

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Differential cross-section and uncertainty from each source, as a function of $p_{T}^{ee}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $p_{T}^{\mu\mu}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t51

Differential cross-section and uncertainty from each source, as a function of $p_{T}^{\mu\mu}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $p_{T}^{e\mu}$ in $e\mu jj$

Figure 7

10.17182/hepdata.83968.v1/t52

Differential cross-section and uncertainty from each source, as a function of $p_{T}^{e\mu}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $p_{T}^{ee}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t53

Differential cross-section and uncertainty from each source, as a function of $p_{T}^{ee}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $p_{T}^{\mu\mu}$ in extreme $\mu\mu jj$

Figure 16

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• #### Meas. of $H_{T}$ in $eejj$

Figure 12

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Differential cross-section and uncertainty from each source, as a function of $H_{T}$ for the dominant process in the $eejj$ measurement...

• #### Meas. of $H_{T}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t57

Differential cross-section and uncertainty from each source, as a function of $H_{T}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $H_{T}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t58

Differential cross-section and uncertainty from each source, as a function of $H_{T}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $H_{T}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t59

Differential cross-section and uncertainty from each source, as a function of $H_{T}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $H_{T}$ in extreme $\mu\mu jj$

Figure 16

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• #### Meas. of $S_{T}$ in $ee jj$

Figure 12

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Differential cross-section and uncertainty from each source, as a function of $S_{T}$ for the dominant process in the $ee jj$...

• #### Meas. of $S_{T}$ in $\mu\mu jj$

Figure 13

10.17182/hepdata.83968.v1/t63

Differential cross-section and uncertainty from each source, as a function of $S_{T}$ for the dominant process in the $\mu\mu jj$...

• #### Meas. of $S_{T}$ in $e\mu jj$

Figure 14

10.17182/hepdata.83968.v1/t64

Differential cross-section and uncertainty from each source, as a function of $S_{T}$ for the dominant process in the $e\mu jj$...

• #### Meas. of $S_{T}$ in extreme $eejj$

Figure 15

10.17182/hepdata.83968.v1/t65

Differential cross-section and uncertainty from each source, as a function of $S_{T}$ for the dominant process in the extreme $eejj$...

• #### Meas. of $S_{T}$ in extreme $\mu\mu jj$

Figure 16

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• #### 95 % confidence level limits

Table 5

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Expected and observed 95% CL lower limits on first- and second-generation leptoquark masses for different values of $\beta$.

• #### Yields in $\mu\mu$ channel

Table 1 of auxiliary material

10.17182/hepdata.83968.v1/t69

Event yields in the dimuon channel control regions with total uncertainties. The observed number of events is given in the...

• #### Yields in $ee$ channel

Table 2 of auxiliary material

10.17182/hepdata.83968.v1/t70

Event yields in the dielectron channel control regions with total uncertainties. The observed number of events is given in the...

• #### Distributions of $m_{LQ}^{min}$

Figure 18

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Distribution of $m_{LQ}^{min}$ in the training region for the BDT for the $ee jj$ and $\mu\mu jj$ channels. Data are...

• #### Distributions of $m_{LQ}^{T}$

Figure 19

10.17182/hepdata.83968.v1/t72

Distribution of $m_{LQ}^{T}$ in the training region for the BDT for the $e\nu jj$ and $\mu\nu jj$ channels. Data are...