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Title: Search for excited leptons in $$\ell\ell\gamma$$ final states in proton-proton collisions at $$\sqrt{s}=$$ 13 TeV

Abstract

A search is presented for excited electrons and muons in $$\ell\ell\gamma$$ final states at the LHC. The search is based on a data sample corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$ of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector in 2016. This is the first search for excited leptons at $$\sqrt{s}=$$ 13 TeV. The observation is consistent with the standard model background prediction, and the most stringent exclusion limits to date are set on the excited lepton mass and the compositeness scale, at 95% confidence level. Excited electrons and muons are excluded for masses below 3.9 and 3.8 TeV, respectively, under the assumption that the excited lepton mass equals the compositeness scale. The best observed limit on the compositeness scale is obtained with an excited lepton mass of around 1.0 TeV, excluding values below 25 TeV for both excited electrons and muons.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1484187
Report Number(s):
FERMILAB-PUB-18-640-CMS; arXiv:1811.03052; CMS-EXO-18-004; CERN-EP-2018-280
1702433
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
JHEP
Additional Journal Information:
Journal Name: JHEP
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. Search for excited leptons in $\ell\ell\gamma$ final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV. United States: N. p., 2018. Web.
Sirunyan, Albert M, & et al. Search for excited leptons in $\ell\ell\gamma$ final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV. United States.
Sirunyan, Albert M, and et al. Wed . "Search for excited leptons in $\ell\ell\gamma$ final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV". United States. https://www.osti.gov/servlets/purl/1484187.
@article{osti_1484187,
title = {Search for excited leptons in $\ell\ell\gamma$ final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV},
author = {Sirunyan, Albert M and et al.},
abstractNote = {A search is presented for excited electrons and muons in $\ell\ell\gamma$ final states at the LHC. The search is based on a data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector in 2016. This is the first search for excited leptons at $\sqrt{s}=$ 13 TeV. The observation is consistent with the standard model background prediction, and the most stringent exclusion limits to date are set on the excited lepton mass and the compositeness scale, at 95% confidence level. Excited electrons and muons are excluded for masses below 3.9 and 3.8 TeV, respectively, under the assumption that the excited lepton mass equals the compositeness scale. The best observed limit on the compositeness scale is obtained with an excited lepton mass of around 1.0 TeV, excluding values below 25 TeV for both excited electrons and muons.},
doi = {},
journal = {JHEP},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}