Scalar Leptoquarks In Pp Collisions Research Articles

Search for scalar leptoquarks in pp collisions at = 13 TeV with the ATLAS experiment

An inclusive search for a new-physics signature of lepton-jet resonances has been performed by the ATLAS experiment. Scalar leptoquarks, pair-produced in pp collisions at = 13 TeV at the large hadron collider, have been considered. An integrated luminosity of 3.2 fb−1, corresponding to the full 2015 dataset was used. First (second) generation leptoquarks were sought in events with two electrons (muons) and two or more jets. The observed event yield in each channel is consistent with Standard Model background expectations. The observed (expected) lower limits on the leptoquark mass at 95% confidence level are 1100 and 1050 GeV (1160 and 1040 GeV) for first and second generation leptoquarks, respectively, assuming a branching ratio into a charged lepton and a quark of 100%. Upper limits on the aforementioned branching ratio are also given as a function of leptoquark mass. Compared with the results of earlier ATLAS searches, the sensitivity is increased for leptoquark masses above 860 GeV, and the observed exclusion limits confirm and extend the published results.

Searches for scalar leptoquarks in pp collisions at [Formula: see text] = 8TeV with the ATLAS detector.

Searches for pair-produced scalar leptoquarks are performed using 20 fb^{-1} of proton–proton collision data provided by the LHC and recorded by the ATLAS detector at sqrt{s}=8 TeV. Events with two electrons (muons) and two or more jets in the final state are used to search for first (second)-generation leptoquarks. The results from two previously published ATLAS analyses are interpreted in terms of third-generation leptoquarks decaying to bnu _{tau }bar{b}bar{nu _{tau }} and tnu _{tau }bar{t}bar{nu _{tau }} final states. No statistically significant excess above the Standard Model expectation is observed in any channel and scalar leptoquarks are excluded at 95 % CL with masses up to m_{mathrm {LQ1}}< 1050 GeV for first-generation leptoquarks, m_{mathrm {LQ2}}< 1000 GeV for second-generation leptoquarks, m_{mathrm {LQ3}}< 625 GeV for third-generation leptoquarks in the bnu _{tau }bar{b}bar{nu _{tau }} channel, and 200 < m_{mathrm {LQ3}}< 640 GeV in the tnu _{tau }bar{t}bar{nu _{tau }} channel.