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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/079/04/0929-0932

    • Keywords

       

      Large Hadron Collider; compact muon solenoid; compositeness; excited leptons; contact interaction.

    • Abstract

       

      A search for excited leptons, carried out with the CMS detector in $pp$ collision at the LHC with $\sqrt{s} = 7$ TeV, is presented. The search has been performed for an associated production of a lepton and an oppositely charged excited lepton $pp \rightarrow ll^{*}$, followed by the decay $l^{*} \rightarrow l\gamma$ , resulting in $ll\gamma$ final state, where $l = e,\mu$. No excess above the Standard Model expectation is observed in the data. Interpreting the findings in the context of $l^{∗}$ production through four-fermion contact interactions and $l^{∗}$ decay via electroweak processes, upper limits are reported for $l^{∗}$ production at this collision energy and the exclusion region in the $\Lambda - M(l^{*})$ parameter space is extended beyond the previously established limits.

    • Author Affiliations

       

      Shilpi Jain1 on behalf of the CMS Collaboration

      1. Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700 064, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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