Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of √s = 13 TeV with the ATLAS experiment

Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Mullier, Geoffrey André Adrien; Rimoldi, Marco; Weston, Thomas Daniel (2019). Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of √s = 13 TeV with the ATLAS experiment. The European physical journal. C, Particles and fields, 79(9) Springer 10.1140/epjc/s10052-019-7181-x

[img]
Preview
Text
Aaboud2019_Article_SearchesForScalarLeptoquarksAn.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (2MB) | Preview

Searches for scalar leptoquarks pair-produced in proton–proton collisions at √s=13 TeV at the Large Hadron Collider are performed by the ATLAS experiment. A data set corresponding to an integrated luminosity of 36.1 fb−1 is used. Final states containing two electrons or two muons and two or more jets are studied, as are states with one electron or muon, 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 extend up to 1.29 TeV and 1.23 TeV for first- and second-generation leptoquarks, respectively, as postulated in the minimal Buchmüller–Rückl–Wyler model, assuming a branching ratio into a charged lepton and a quark of 50%. In addition, measurements of particle-level fiducial and differential cross sections are presented for the Z→ee, Z→μμ and tt¯ processes in several regions related to the search control regions. Predictions from a range of generators are compared with the measurements, and good agreement is seen for many of the observables. However, the predictions for the Z→ℓℓ measurements in observables sensitive to jet energies disagree with the data.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio; Mullier, Geoffrey André Adrien; Rimoldi, Marco and Weston, Thomas Daniel

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

Springer

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

16 Jun 2020 11:18

Last Modified:

16 Jun 2020 11:28

Publisher DOI:

10.1140/epjc/s10052-019-7181-x

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt; ATLAS collaboration

BORIS DOI:

10.7892/boris.143603

URI:

https://boris.unibe.ch/id/eprint/143603

Actions (login required)

Edit item Edit item
Provide Feedback