# Limits for Excited ${{\boldsymbol e}}$ (${{\boldsymbol e}^{*}}$) from Single Production INSPIRE search

These limits are from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{*}}{{\mathit e}}$ , ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}^{*}}{{\mathit \nu}}$ , or ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{*}}$ X and depend on transition magnetic coupling between ${{\mathit e}}$ and ${{\mathit e}^{*}}$. All limits assume ${{\mathit e}^{*}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \gamma}}$ decay except as noted. Limits from LEP, UA2, and H1 are for chiral coupling, whereas all other limits are for nonchiral coupling, ${{\mathit \eta}_{{L}}}$ = ${{\mathit \eta}_{{R}}}$ = 1. In most papers, the limit is expressed in the form of an excluded region in the $\lambda −{\mathit m}_{{{\mathit e}^{*}}}$ plane. See the original papers.

For limits prior to 1987, see our 1992 edition (Physical Review D45 S1 (1992)).
VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{> 3000}$ 95 1
 2015 AP
ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{(*)}}{{\mathit e}^{*}}{{\mathit X}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$> 2450$ 95 2
 2016 AQ
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}^{*}}{{\mathit X}}$
$> 2200$ 95 3
 2013 BB
ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}^{*}}{{\mathit X}}$
$> 1900$ 95 4
 2013 AE
CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}^{*}}{{\mathit X}}$
$> 1870$ 95 5
 2012 AZ
ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{(*)}}{{\mathit e}^{*}}{{\mathit X}}$
1  AAD 2015AP search for ${{\mathit e}^{*}}$ production in evens with three or more charged leptons in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The quoted limit assumes ${{\mathit \Lambda}}$ = ${\mathit m}_{{{\mathit e}^{*}}}$, ${{\mathit f}}$ = ${{\mathit f}^{\,'}}$ = 1. The contact interaction is included in the ${{\mathit e}^{*}}$ production and decay amplitudes.
2  KHACHATRYAN 2016AQ search for single ${{\mathit e}^{*}}$ production in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above is from the ${{\mathit e}^{*}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \gamma}}$ search channel assuming ${{\mathit f}}$ = ${{\mathit f}^{\,'}}$ = 1, ${\mathit m}_{{{\mathit e}^{*}}}$ = $\Lambda$. See their Table 7 for limits in other search channels or with different assumptions.
3  AAD 2013BB search for single ${{\mathit e}^{*}}$ production in ${{\mathit p}}{{\mathit p}}$ collisions with ${{\mathit e}^{*}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \gamma}}$ decay. ${{\mathit f}}$ = ${{\mathit f}^{\,'}}$ = 1, and ${{\mathit e}^{*}}$ production via contact interaction with ${{\mathit \Lambda}}$ = ${\mathit m}_{{{\mathit e}^{*}}}$ are assumed.
4  CHATRCHYAN 2013AE search for single ${{\mathit e}^{*}}$ production in ${{\mathit p}}{{\mathit p}}$ collisions with ${{\mathit e}^{*}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \gamma}}$ decay. ${{\mathit f}}$ = ${{\mathit f}^{\,'}}$ = 1, and ${{\mathit e}^{*}}$ production via contact interaction with ${{\mathit \Lambda}}$ = ${\mathit m}_{{{\mathit e}^{*}}}$ are assumed.
5  AAD 2012AZ search for ${{\mathit e}^{*}}$ production via four-fermion contact interaction in ${{\mathit p}}{{\mathit p}}$ collisions with ${{\mathit e}^{*}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \gamma}}$ decay. The quoted limit assumes ${{\mathit \Lambda}}$ = ${\mathit m}_{{{\mathit e}^{*}}}$. See their Fig. 8 for the exclusion plot in the mass-coupling plane.
References:
 KHACHATRYAN 2016AQ
JHEP 1603 125 Search for Excited Leptons in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
JHEP 1508 138 Search for New Phenomena in Events with Three or More Charged Leptons in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
NJP 15 093011 Search for Excited Electrons and Muons in $\sqrt {s }$ = 8 TeV Proton$−$Proton Collisions with the ATLAS Detector
PL B720 309 Search for Excited Leptons in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
PR D85 072003 Search for Excited Leptons in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector