Search for excited leptons in the $\ell\ell\gamma$ final state in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

Search for excited leptons in the $\ell\ell\gamma$ final state in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

CMS

Collaboration

2018

Report number:

CMS-PAS-EXO-18-004

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A search is presented for excited electrons and muons using a data sample of proton-proton collisions at a center-of-mass energy of

\sqrt{s}=13~\mathrm{TeV}

, collected with the CMS detector in 2016 and corresponding to an integrated luminosity of

35.9~\mathrm{fb}^{-1}

. This is the first search in the

\ell\ell\gamma

final state in proton-proton collisions at

\sqrt{s}=13~\mathrm{TeV}

. The observed data are consistent with the standard model prediction, and exclusion limits on the excited lepton mass and the compositeness scale are set. Excited electrons (muons) with a mass below

3.9~(3.8)~\mathrm{TeV}

are excluded under the assumption that the excited lepton mass equals the compositeness scale. The best observed limit on the compositeness scale is obtained in the mass range between 0.5 and

1.0~\mathrm{TeV}

, excluding a compositeness scale below

25~\mathrm{TeV}

for both excited electrons and muons. These are the most stringent limits to date in the

\ell\ell\gamma

final state.

Note:

Preliminary results

Data
p p: scattering
p p: colliding beams
photon: associated production
lepton: mass
final state: (dilepton photon)
lepton: composite
contact interaction
mediation: gauge
lepton: excited state

References(43)

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