Abstract

A search for pair-produced scalar and vector leptoquarks decaying into quarks and leptons of different generations is presented. It uses the full LHC Run 2 (2015-2018) data set of 139 fb$^{-1}$ collected with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. Scalar leptoquarks with charge -(1/3)e as well as scalar and vector leptoquarks with charge +(2/3)e are considered. All possible decays of the pair-produced leptoquarks into quarks of the third generation (t, b) and charged or neutral leptons of the first or second generation ($e, \mu, \nu$) with exactly one electron or muon in the final state are investigated. No significant deviations from the Standard Model expectation are observed. Upper limits on the production cross-section are provided for eight models as a function of the leptoquark mass and the branching ratio of the leptoquark into the charged or neutral lepton. In addition, lower limits on the leptoquark masses are derived for all models across a range of branching ratios. Two of these models have the goal of providing an explanation for the recent B-anomalies. In both models, a vector leptoquark decays into charged and neutral leptons of the second generation with a similar branching fraction. Lower limits of 1980 GeV and 1710 GeV are set on the leptoquark mass for these two models.

Table of Contents

10.17182/hepdata.135703.v1/t1

- - - - - - - - Overview of HEPData Record - - - - - - - -...
$LQ_u \rightarrow t\nu/b\mu$ observed limits

Figure 9a (observed)

10.17182/hepdata.135703.v1/t2

Observed 95% CL limits on the production cross-section for scalar up-type LQs decaying into a top quark and a neutrino...
$LQ_u \rightarrow t\nu/b\mu$ expected limits

Figure 9a (expected)

10.17182/hepdata.135703.v1/t3

Expected 95% CL limits on the production cross-section for scalar up-type LQs decaying into a top quark and a neutrino...
$LQ_u \rightarrow t\nu/be$ observed limits

Figure 9b (observed)

10.17182/hepdata.135703.v1/t4

Observed 95% CL limits on the production cross-section for scalar up-type LQs decaying into a top quark and a neutrino...
$LQ_u \rightarrow t\nu/be$ expected limits

Figure 9b (expected)

10.17182/hepdata.135703.v1/t5

Expected 95% CL limits on the production cross-section for scalar up-type LQs decaying into a top quark and a neutrino...
$LQ_d \rightarrow t\mu/b\nu$ observed limits

Figure 9c (observed)

10.17182/hepdata.135703.v1/t6

Observed 95% CL limits on the production cross-section for scalar down-type LQs decaying into a bottom quark and a neutrino...
$LQ_d \rightarrow t\mu/b\nu$ expected limits

Figure 9c (expected)

10.17182/hepdata.135703.v1/t7

Expected 95% CL limits on the production cross-section for scalar down-type LQs decaying into a bottom quark and a neutrino...
$LQ_d \rightarrow te/b\nu$ observed limits

Figure 9d (observed)

10.17182/hepdata.135703.v1/t8

Observed 95% CL limits on the production cross-section for scalar down-type LQs decaying into a bottom quark and a neutrino...
$LQ_d \rightarrow te/b\nu$ expected limits

Figure 9d (expected)

10.17182/hepdata.135703.v1/t9

Expected 95% CL limits on the production cross-section for scalar down-type LQs decaying into a bottom quark and a neutrino...
$vLQ_{YM} \rightarrow t\nu/b\mu$ observed limits

Figure 10a (observed)

10.17182/hepdata.135703.v1/t10

Observed 95% CL limits on the production cross-section for vector up-type LQs in the Yang-Mills coupling scenario decaying into a...
$vLQ_{YM} \rightarrow t\nu/b\mu$ expected limits

Figure 10a (expected)

10.17182/hepdata.135703.v1/t11

Expected 95% CL limits on the production cross-section for vector up-type LQs in the Yang-Mills coupling scenario decaying into a...
$vLQ_{YM} \rightarrow t\nu/be$ observed limits

Figure 10b (observed)

10.17182/hepdata.135703.v1/t12

Observed 95% CL limits on the production cross-section for vector up-type LQs in the Yang-Mills coupling scenario decaying into a...
$vLQ_{YM} \rightarrow t\nu/be$ expected limits

Figure 10b (expected)

10.17182/hepdata.135703.v1/t13

Expected 95% CL limits on the production cross-section for vector up-type LQs in the Yang-Mills coupling scenario decaying into a...
$vLQ_{min} \rightarrow t\nu/b\mu$ observed limits

Figure 10c (observed)

10.17182/hepdata.135703.v1/t14

Observed 95% CL limits on the production cross-section for vector up-type LQs in the minimal coupling scenario decaying into a...
$vLQ_{min} \rightarrow t\nu/b\mu$ expected limits

Figure 10c (expected)

10.17182/hepdata.135703.v1/t15

Expected 95% CL limits on the production cross-section for vector up-type LQs in the minimal coupling scenario decaying into a...
$vLQ_{min} \rightarrow t\nu/be$ observed limits

Figure 10d (observed)

10.17182/hepdata.135703.v1/t16

Observed 95% CL limits on the production cross-section for vector up-type LQs in the minimal coupling scenario decaying into a...
$vLQ_{min} \rightarrow t\nu/be$ expected limits

Figure 10d (expected)

10.17182/hepdata.135703.v1/t17

Expected 95% CL limits on the production cross-section for vector up-type LQs in the minimal coupling scenario decaying into a...
$LQ_u \rightarrow t\nu/b\mu$ Acceptance times Efficiency

Table 1 from auxiliary material

10.17182/hepdata.135703.v1/t18

Product of signal acceptance and efficiency in the training region for scalar up-type LQs decaying into top quarks and neutrinos...
$LQ_u \rightarrow t\nu/be$ Acceptance times Efficiency

Table 2 from auxiliary material

10.17182/hepdata.135703.v1/t19

Product of signal acceptance and efficiency in the training region for scalar up-type LQs decaying into top quarks and neutrinos...
$LQ_d \rightarrow t\mu/b\nu$ Acceptance times Efficiency

Table 3 from auxiliary material

10.17182/hepdata.135703.v1/t20

Product of signal acceptance and efficiency in the training region for scalar down-type LQs decaying into top quarks and muons...
$LQ_d \rightarrow te/b\nu$ Acceptance times Efficiency

Table 4 from auxiliary material

10.17182/hepdata.135703.v1/t21

Product of signal acceptance and efficiency in the training region for scalar down-type LQs decaying into top quarks and electrons...
$vLQ_{YM} \rightarrow t\nu/b\mu$ Acceptance times Efficiency

Table 5 from auxiliary material

10.17182/hepdata.135703.v1/t22

Product of signal acceptance and efficiency in the training region for vector LQs in the Yang-Mills coupling scenario decaying into...
$vLQ_{YM} \rightarrow t\nu/be$ Acceptance times Efficiency

Table 6 from auxiliary material

10.17182/hepdata.135703.v1/t23

Product of signal acceptance and efficiency in the training region for vector LQs in the Yang-Mills coupling scenario decaying into...
$vLQ_{min} \rightarrow t\nu/b\mu$ Acceptance times Efficiency

Table 7 from auxiliary material

10.17182/hepdata.135703.v1/t24

Product of signal acceptance and efficiency in the training region for vector LQs in the minimal coupling scenario decaying into...
$vLQ_{min} \rightarrow t\nu/be$ Acceptance times Efficiency

Table 8 from auxiliary material

10.17182/hepdata.135703.v1/t25

Product of signal acceptance and efficiency in the training region for vector LQs in the minimal coupling scenario decaying into...
Scalar LQs cut-flow

Table 9 from auxiliary material

10.17182/hepdata.135703.v1/t26

Cut-flow for the four models containing scalar LQs at a mass of $m_{LQ}=1300$ GeV and $\mathcal{B}(LQ_{mix}\rightarrow q_3\ell)=0.5$.
Vector LQs cut-flow

Table 10 from auxiliary material

10.17182/hepdata.135703.v1/t27

Cut-flow for the four models containing vector LQs at a mass of $m_{LQ}=1300$ GeV and $\mathcal{B}(LQ_{mix}\rightarrow q_3\ell)=0.5$.

Table of Contents

$LQ_u \rightarrow t\nu/b\mu$ observed limits

$LQ_u \rightarrow t\nu/b\mu$ expected limits

$LQ_u \rightarrow t\nu/be$ observed limits

$LQ_u \rightarrow t\nu/be$ expected limits

$LQ_d \rightarrow t\mu/b\nu$ observed limits

$LQ_d \rightarrow t\mu/b\nu$ expected limits

$LQ_d \rightarrow te/b\nu$ observed limits

$LQ_d \rightarrow te/b\nu$ expected limits

$vLQ_{YM} \rightarrow t\nu/b\mu$ observed limits

$vLQ_{YM} \rightarrow t\nu/b\mu$ expected limits

$vLQ_{YM} \rightarrow t\nu/be$ observed limits

$vLQ_{YM} \rightarrow t\nu/be$ expected limits

$vLQ_{min} \rightarrow t\nu/b\mu$ observed limits

$vLQ_{min} \rightarrow t\nu/b\mu$ expected limits

$vLQ_{min} \rightarrow t\nu/be$ observed limits

$vLQ_{min} \rightarrow t\nu/be$ expected limits

$LQ_u \rightarrow t\nu/b\mu$ Acceptance times Efficiency

$LQ_u \rightarrow t\nu/be$ Acceptance times Efficiency

$LQ_d \rightarrow t\mu/b\nu$ Acceptance times Efficiency

$LQ_d \rightarrow te/b\nu$ Acceptance times Efficiency

$vLQ_{YM} \rightarrow t\nu/b\mu$ Acceptance times Efficiency

$vLQ_{YM} \rightarrow t\nu/be$ Acceptance times Efficiency

$vLQ_{min} \rightarrow t\nu/b\mu$ Acceptance times Efficiency

$vLQ_{min} \rightarrow t\nu/be$ Acceptance times Efficiency

Scalar LQs cut-flow

Vector LQs cut-flow

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