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 ATLAS 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

    10.17182/hepdata.83968.v1/t3

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

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

    Figure 7

    10.17182/hepdata.83968.v1/t4

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

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

    Figure 8

    10.17182/hepdata.83968.v1/t5

    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

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

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

    Figure 14

    10.17182/hepdata.83968.v1/t10

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

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

    Figure 15

    10.17182/hepdata.83968.v1/t11

    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

    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 $\mu\mu...

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

    Figure 17

    10.17182/hepdata.83968.v1/t19

    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 $e\mu...

  • 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

    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 $\mu\mu...

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

    Figure 17

    10.17182/hepdata.83968.v1/t25

    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 $e\mu...

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

    Figure 12

    10.17182/hepdata.83968.v1/t26

    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

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t31

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

  • 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

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t37

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

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

    Figure 12

    10.17182/hepdata.83968.v1/t38

    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

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t43

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

  • 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

    10.17182/hepdata.83968.v1/t48

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t49

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

  • Meas. of $p_{T}^{ee}$ in $eejj$

    Figure 12

    10.17182/hepdata.83968.v1/t50

    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

    10.17182/hepdata.83968.v1/t54

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

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

    Figure 8

    10.17182/hepdata.83968.v1/t55

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

  • Meas. of $H_{T}$ in $eejj$

    Figure 12

    10.17182/hepdata.83968.v1/t56

    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

    10.17182/hepdata.83968.v1/t60

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t61

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

  • Meas. of $S_{T}$ in $ee jj$

    Figure 12

    10.17182/hepdata.83968.v1/t62

    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

    10.17182/hepdata.83968.v1/t66

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

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

    Figure 17

    10.17182/hepdata.83968.v1/t67

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

  • 95 % confidence level limits

    Table 5

    10.17182/hepdata.83968.v1/t68

    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

    10.17182/hepdata.83968.v1/t71

    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...

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