TY - JOUR
T1 - Search for excited electrons singly produced in proton-proton collisions at root s=13 TeV with the ATLAS experiment at the LHC
AU - Aaboud, M.
AU - Aad, G.
AU - Abbott, B.
AU - Abbott, DC
AU - Abdinov, O.
AU - Abeloos, B
AU - Abhayasinghe, DK
AU - Abidi, S.H.
AU - AbouZeid, Ossama Sherif Alexander
AU - Abraham, NL
AU - Besjes, Geert-Jan
AU - Bajic, Milena
AU - Alonso Diaz, Alejandro
AU - Camplani, Alessandra
AU - Galster, Gorm Aske Gram Krohn
AU - Stark, Simon Holm
AU - Dam, Mogens
AU - de Almeida Dias, Flavia
AU - Wiglesworth, Graig
AU - Hansen, Peter Henrik
AU - hqz214, hqz214
AU - Hansen, Jørn Dines
AU - Hansen, Jørgen Beck
AU - Ignazzi, Rosanna
AU - Xella, Stefania
AU - Monk, James William
AU - Petersen, Troels Christian
AU - ATLAS
PY - 2019/9/1
Y1 - 2019/9/1
N2 - A search for excited electrons produced in pp collisions at s = 13 Te 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 Te, the lower bound for Λ is 11 Te. In the special case of me∗=Λ, the values of me∗<4.8 Te are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.
AB - A search for excited electrons produced in pp collisions at s = 13 Te 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 Te, the lower bound for Λ is 11 Te. In the special case of me∗=Λ, the values of me∗<4.8 Te are excluded. The presented limits on Λ are more stringent than those obtained in previous searches.
U2 - 10.1140/epjc/s10052-019-7295-1
DO - 10.1140/epjc/s10052-019-7295-1
M3 - Journal article
SN - 1434-6044
VL - 79
JO - European Physical Journal C
JF - European Physical Journal C
IS - 9
M1 - 803
ER -