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A search for excited leptons in $pp$ Collisions at $s=$ 7 TeV

A search for excited leptons in $pp$ Collisions at $s=$ 7 TeV
A search for excited leptons in $pp$ Collisions at $s=$ 7 TeV
A search for excited leptons is carried out with the CMS detector at the LHC, using 36pb−1 of pp collision data recorded at
s=7TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton ⁎pp→ℓℓ⁎, followed by the decay ⁎ℓ⁎→ℓγ
, resulting in the ℓℓγ final state, where ℓ=e,μ. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of ⁎ℓ⁎ production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for ⁎ℓ⁎
production at this collision energy. The exclusion region in the compositeness scale Λ and excited lepton mass ⁎Mℓ⁎ parameter space is extended beyond previously established limits. For ⁎Λ=Mℓ⁎, excited lepton masses are excluded below 1070GeV/c2 for ⁎e⁎ and 1090GeV/c2 for ⁎μ⁎ at the 95% confidence level.
0370-2693
143-162
Chatrchyan, Serguei
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Chatrchyan, Serguei
23ce6af5-bdd2-435c-92c8-9b1b71a261ee
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2011) A search for excited leptons in $pp$ Collisions at $s=$ 7 TeV. Physics Letters B, 704 (3), 143-162. (doi:10.1016/j.physletb.2011.09.021).

Record type: Article

Abstract

A search for excited leptons is carried out with the CMS detector at the LHC, using 36pb−1 of pp collision data recorded at
s=7TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton ⁎pp→ℓℓ⁎, followed by the decay ⁎ℓ⁎→ℓγ
, resulting in the ℓℓγ final state, where ℓ=e,μ. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of ⁎ℓ⁎ production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for ⁎ℓ⁎
production at this collision energy. The exclusion region in the compositeness scale Λ and excited lepton mass ⁎Mℓ⁎ parameter space is extended beyond previously established limits. For ⁎Λ=Mℓ⁎, excited lepton masses are excluded below 1070GeV/c2 for ⁎e⁎ and 1090GeV/c2 for ⁎μ⁎ at the 95% confidence level.

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More information

Published date: 2011
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 411292
URI: http://eprints.soton.ac.uk/id/eprint/411292
ISSN: 0370-2693
PURE UUID: ffeb1a52-9c5d-4f38-948d-0f4045f7ff81
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 16 Jun 2017 16:32
Last modified: 10 Nov 2021 03:19

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Contributors

Author: Serguei Chatrchyan
Corporate Author: The CMS Collaboration

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