Search for leptoquarks decaying into the b$\tau$ final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 10 (2023) 001, 2023.

Abstract (data abstract)
A search for leptoquarks decaying into the $b\tau$ final state is performed using Run 2 proton-proton collision data from the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb$^{-1}$ at $\sqrt{s} = 13$ TeV recorded by the ATLAS detector. The benchmark models considered in this search are vector leptoquarks with electric charge of 2/3e and scalar leptoquarks with an electric charge of 4/3e. No significant excess above the Standard Model prediction is observed, and 95% confidence level upper limits are set on the cross-section of leptoquarks decaying into $b\tau$. For the vector leptoquark production two models are considered: the Yang-Mills and Minimal coupling models. In the Yang-Mills (Minimal coupling) scenario, vector leptoquarks with a mass below 1.58 (1.35) TeV are excluded for a gauge coupling of 1.0 and below 2.05 (1.99) TeV for a gauge coupling of 2.5. In the case of scalar leptoquarks, masses below 1.28 TeV (1.53 TeV) are excluded for a Yukawa coupling of 1.0 (2.5). Finally, an interpretation of the results with minimal model dependence is performed for each of the signal region categories, and limits on the visible cross-section for beyond the Standard Model processes are provided.

  • Table 1

    Data from Figure 6A

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    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 2

    Data from Figure 6B

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    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 3

    Data from Figure 6C

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    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 4

    Data from Figure 6D

    10.17182/hepdata.140957.v1/t4

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 5

    Data from Figure 6E

    10.17182/hepdata.140957.v1/t5

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 6

    Data from Figure 6F

    10.17182/hepdata.140957.v1/t6

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of single plus non-resonant plus pair...

  • Table 7

    Data from Figure 7A

    10.17182/hepdata.140957.v1/t7

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced vector LQ (green lines) and...

  • Table 8

    Data from Figure 7B

    10.17182/hepdata.140957.v1/t8

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced vector LQ (green lines) and...

  • Table 9

    Data from Figure 8A

    10.17182/hepdata.140957.v1/t9

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.0 on the cross-section of single...

  • Table 10

    Data from Figure 8B

    10.17182/hepdata.140957.v1/t10

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.7 on the cross-section of single...

  • Table 11

    Data from Figure 8C

    10.17182/hepdata.140957.v1/t11

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 2.5 on the cross-section of single...

  • Table 12

    Data from Figure 9

    10.17182/hepdata.140957.v1/t12

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced $\widetilde{S_{1}}$ (green lines) and for...

  • Table 13

    Data from Figure 11

    10.17182/hepdata.140957.v1/t13

    Observed (solid line) and expected (dashed line) 95% upper limits on the visible cross-section, $\sigma_{\mathrm{vis}}$, obtained from model-independent search by...

  • Table 14

    Data from Auxiliary Figure 1A

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    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 15

    Data from Auxiliary Figure 1B

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    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 16

    Data from Auxiliary Figure 1C

    10.17182/hepdata.140957.v1/t16

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 17

    Data from Auxiliary Figure 1D

    10.17182/hepdata.140957.v1/t17

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 18

    Data from Auxiliary Figure 1E

    10.17182/hepdata.140957.v1/t18

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 19

    Data from Auxiliary Figure 1F

    10.17182/hepdata.140957.v1/t19

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly plus non-resonant produced vector...

  • Table 20

    Data from Auxiliary Figure 2A

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    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.0 on the cross-section of singly...

  • Table 21

    Data from Auxiliary Figure 2B

    10.17182/hepdata.140957.v1/t21

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.7 on the cross-section of singly...

  • Table 22

    Data from Auxiliary Figure 2C

    10.17182/hepdata.140957.v1/t22

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 2.5 on the cross-section of singly...

  • Table 23

    Data from Auxiliary Figure 3A

    10.17182/hepdata.140957.v1/t23

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $\widetilde{S_{1}}$ model from the combination of the...

  • Table 24

    Data from Auxiliary Figure 3B

    10.17182/hepdata.140957.v1/t24

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $\widetilde{S_{1}}$ model from the combination of the...

  • Table 25

    Data from Auxiliary Figure 3C

    10.17182/hepdata.140957.v1/t25

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $\widetilde{S_{1}}$ model from the combination of the...

  • Table 26

    Data from Auxiliary Figure 4A

    10.17182/hepdata.140957.v1/t26

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{MIN}$ model from the combination of the...

  • Table 27

    Data from Auxiliary Figure 4B

    10.17182/hepdata.140957.v1/t27

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{MIN}$ model from the combination of the...

  • Table 28

    Data from Auxiliary Figure 4C

    10.17182/hepdata.140957.v1/t28

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{MIN}$ model from the combination of the...

  • Table 29

    Data from Auxiliary Figure 5A

    10.17182/hepdata.140957.v1/t29

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{YM}$ model from the combination of the...

  • Table 30

    Data from Auxiliary Figure 5B

    10.17182/hepdata.140957.v1/t30

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{YM}$ model from the combination of the...

  • Table 31

    Data from Auxiliary Figure 5C

    10.17182/hepdata.140957.v1/t31

    The signal acceptance times efficiency for single plus non-resonant produced LQ in the $U_1^{YM}$ model from the combination of the...

  • Table 32

    Data from Auxiliary Figure 9A

    10.17182/hepdata.140957.v1/t32

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 33

    Data from Auxiliary Figure 9B

    10.17182/hepdata.140957.v1/t33

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 34

    Data from Auxiliary Figure 9C

    10.17182/hepdata.140957.v1/t34

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 35

    Data from Auxiliary Figure 9D

    10.17182/hepdata.140957.v1/t35

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 36

    Data from Auxiliary Figure 9E

    10.17182/hepdata.140957.v1/t36

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 37

    Data from Auxiliary Figure 9F

    10.17182/hepdata.140957.v1/t37

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of singly produced vector LQ signals...

  • Table 38

    Data from Auxiliary Figure 10A

    10.17182/hepdata.140957.v1/t38

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 39

    Data from Auxiliary Figure 10B

    10.17182/hepdata.140957.v1/t39

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 40

    Data from Auxiliary Figure 10C

    10.17182/hepdata.140957.v1/t40

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 41

    Data from Auxiliary Figure 10D

    10.17182/hepdata.140957.v1/t41

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 42

    Data from Auxiliary Figure 10E

    10.17182/hepdata.140957.v1/t42

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 43

    Data from Auxiliary Figure 10F

    10.17182/hepdata.140957.v1/t43

    Observed (solid line) and expected (dashed line) 95% CL upper limits on the cross-section of the single plus non-resonant plus...

  • Table 44

    Data from Auxiliary Figure 11A

    10.17182/hepdata.140957.v1/t44

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced vector LQ (green lines) and...

  • Table 45

    Data from Auxiliary Figure 11B

    10.17182/hepdata.140957.v1/t45

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced vector LQ (green lines) and...

  • Table 46

    Data from Auxiliary Figure 12A

    10.17182/hepdata.140957.v1/t46

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.0 on the cross-section of singly-produced...

  • Table 47

    Data from Auxiliary Figure 12B

    10.17182/hepdata.140957.v1/t47

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.7 on the cross-section of singly-produced...

  • Table 48

    Data from Auxiliary Figure 12C

    10.17182/hepdata.140957.v1/t48

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 2.5 on the cross-section of singly-produced...

  • Table 49

    Data from Auxiliary Figure 13A

    10.17182/hepdata.140957.v1/t49

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.0 on the cross-section of single...

  • Table 50

    Data from Auxiliary Figure 13B

    10.17182/hepdata.140957.v1/t50

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 1.7 on the cross-section of single...

  • Table 51

    Data from Auxiliary Figure 13C

    10.17182/hepdata.140957.v1/t51

    Observed (solid line) and expected (dashed line) 95% CL upper limits for $\lambda$ = 2.5 on the cross-section of single...

  • Table 52

    Data from Auxiliary Figure 14

    10.17182/hepdata.140957.v1/t52

    The two-dimensional 95% CL exclusion limits in the $\lambda$-$m_{LQ}$ plane for singly plus non-resonant produced $\widetilde{S_{1}}$ (green lines) and for...

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