# Search for excited electrons singly produced in proton--proton collisions at \sqrts=13 TeV with the ATLAS experiment at the LHC

Franconi, Laura; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter; Ereditato, Antonio (2019). Search for excited electrons singly produced in proton--proton collisions at \sqrts=13 TeV with the ATLAS experiment at the LHC. The European physical journal. C, Particles and fields, 79(9) Springer 10.1140/epjc/s10052-019-7295-1

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Aaboud2019_Article_SearchForExcitedElectronsSingl.pdf - Published Version

A search for excited electrons produced in pp collisions at s√ = 13 TeV via a contact interaction qq¯→ee∗ is presented. The search uses 36.1 fb−1 of data collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider. Decays of the excited electron into an electron and a pair of quarks (eqq¯) are targeted in final states with two electrons and two hadronic jets, and decays via a gauge interaction into a neutrino and a W boson (νW) are probed in final states with an electron, missing transverse momentum, and a large-radius jet consistent with a hadronically decaying W boson. No significant excess is observed over the expected backgrounds. Upper limits are calculated for the pp→ee∗→eeqq¯ and pp→ee∗→eνW production cross sections as a function of the excited electron mass me∗ at 95% confidence level. The limits are translated into lower bounds on the compositeness scale parameter Λ of the model as a function of me∗. For me∗<0.5 TeV, the lower bound for Λ is 11 TeV. In the special case of me∗=Λ, the values of me∗<4.8 TeV are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.

#### 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:

Franconi, Laura; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Anders, John Kenneth; Beck, Hans Peter and Ereditato, Antonio

#### Subjects:

500 Science > 530 Physics

1434-6044

Springer

English

#### Submitter:

BORIS Import LHEP

#### Date Deposited:

12 Jun 2020 13:50

14 Jun 2020 02:52

#### Publisher DOI:

10.1140/epjc/s10052-019-7295-1

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

#### BORIS DOI:

10.7892/boris.143573

#### URI:

https://boris.unibe.ch/id/eprint/143573