Search for type-III seesaw heavy leptons in leptonic final states in pp collisions at √s=13 TeV with the ATLAS detector

Anders, J. K.; Beck, H. P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L.; Haug, S.; Ilg, A.; Lehmann, N.; Mueller, R.; Weber, M. S. (2022). Search for type-III seesaw heavy leptons in leptonic final states in pp collisions at √s=13 TeV with the ATLAS detector. The European physical journal. C, Particles and fields, 82(11) Springer 10.1140/epjc/s10052-022-10785-0

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A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139fb−1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Anders, John Kenneth, Beck, Hans Peter, Chatterjee, Meghranjana, Ereditato, Antonio, Franconi, Laura, Halser, Lea, Haug, Sigve, Ilg, Armin, Lehmann, Niklaus, Müller, Roman, Weber, Michele

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

Springer

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

05 Apr 2023 15:20

Last Modified:

13 Apr 2023 14:52

Publisher DOI:

10.1140/epjc/s10052-022-10785-0

Additional Information:

Kollaboration - Es sind nur die Berner Autor*innen namentlich erwaehnt; ATLAS collaboration

BORIS DOI:

10.48350/181420

URI:

https://boris.unibe.ch/id/eprint/181420

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