Abstract (data abstract)

CERN-LHC, ATLAS. A search for pair-produced scalar or vector leptoquarks (LQs) decaying into a $b$-quark and a $\tau$-lepton is presented using the full LHC Run 2 (2015-2018) data sample of 139 fb$^{\text{-1}}$ collected with the ATLAS detector in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. Events in which at least one $\tau$-lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of m$_\text{LQ}$ and branching ratio B into a $\tau$-lepton and $b$-quark. For scalar LQs, masses below 1460 GeV are excluded assuming B = 100%, while for vector LQs the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang-Mills, YM) scenario. Basic event selection: - ==0(1) electron or muon for $\tau_\text{lep}\tau_\text{had}$ ($\tau_\text{had}\tau_\text{had}$) region: $p_T$ thresholds are corresponding trigger, in fiducial volume, isolated from jets - ==1(2) hadronically decaying $\tau$s ($\tau_{had}$s) for $\tau_\text{lep}\tau_\text{had}$ ($\tau_\text{had}\tau_\text{had}$) region: $p_T$ > 100 GeV (thresholds are corresponding trigger) for $\tau_\text{lep}\tau_\text{had}$ ($\tau_\text{had}\tau_\text{had}$) region, in fiducial volume, isolated from jets - >=2 small-R jets, with 1 or 2 $b$-tagged - Opposite charge electron/muon/$\tau_{had}$s and $\tau_{had}$s - MMC mass from 2 leptons ($m_{MMC}$) should be not 40 < $m_{MMC}$ < 150 GeV (Z veto) - Missing transverse momentum > 100 GeV - Scalar sum of $p_T$ ($s_T$) > 600 GeV See paper for more detail.

Table 0: Acceptance times Efficiency, lephad

Data from Figure 2a

10.17182/hepdata.145072.v1/t1

Acceptance $\times$ efficiency for the $\tau_\text{lep}\tau_\text{had}$ signal region assuming $\beta$ = 0.5 as a function of m$_\text{LQ}$.
Table 1: Acceptance times Efficiency, hadhad

Data from Figure 2b

10.17182/hepdata.145072.v1/t2

Acceptance $\times$ efficiency for the $\tau_\text{had}\tau_\text{had}$ signal region assuming $\beta$ = 0.5 as a function of m$_\text{LQ}$.
Table 2: Scalar LQ Cross-Section Limits

Data from Figure 9a

10.17182/hepdata.145072.v1/t3

The observed and expected 95% CL upper limits on the scalar LQ pair production cross-sections assuming B = 1 as...
Table 3: Minimal Vector LQ Cross-Section Limits

Data from Figure 9b

10.17182/hepdata.145072.v1/t4

The observed and expected 95% CL upper limits on the minimal coupling vector LQ pair production cross-sections assuming B =...
Table 4: Yang-Mills Vector LQ Cross-Section Limits

Data from Figure 9c

10.17182/hepdata.145072.v1/t5

The observed and expected 95% CL upper limits on the Yang-Mills coupling vector LQ pair production cross-sections assuming B =...
Table 5: Limits on B(LQ->b+tau) v.s. Scalar LQ Mass

Data from Figure 10a

10.17182/hepdata.145072.v1/t6

The observed and expected 95% CL upper limits on the branching ratio into charged leptons as a function of m$_\text{LQ}$...
Table 6: Limits on B(LQ->b+tau) v.s. Minimal Vector LQ Mass

Data from Figure 10b

10.17182/hepdata.145072.v1/t7

The observed and expected 95% CL upper limits on the branching ratio into charged leptons as a function of m$_\text{LQ}$...
Table 7: Limits on B(LQ->b+tau) v.s. YM Vector LQ Mass

Data from Figure 10c

10.17182/hepdata.145072.v1/t8

The observed and expected 95% CL upper limits on the branching ratio into charged leptons as a function of m$_\text{LQ}$...

Table 0: Acceptance times Efficiency, lephad

Table 1: Acceptance times Efficiency, hadhad

Table 2: Scalar LQ Cross-Section Limits

Table 3: Minimal Vector LQ Cross-Section Limits

Table 4: Yang-Mills Vector LQ Cross-Section Limits

Table 5: Limits on B(LQ->b+tau) v.s. Scalar LQ Mass

Table 6: Limits on B(LQ->b+tau) v.s. Minimal Vector LQ Mass

Table 7: Limits on B(LQ->b+tau) v.s. YM Vector LQ Mass

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