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Search for displaced leptons in the e-mu final state at the CMS experiment

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2016, Doctor of Philosophy, Ohio State University, Physics.
A search for new long-lived particles decaying to leptons is presented using proton-proton collisions produced by the LHC at a center-of-mass energy of 13 TeV. Data used for the analysis were collected by the CMS detector during the 2015 run and correspond to an integrated luminosity of 2.6 inverse-femtobarns. Events are selected with an electron and muon that both have transverse impact parameter values between 0.02 cm and 10 cm. The search has been designed to be sensitive to a wide range of models with non-prompt e-mu final states. No significant excess is observed. Limits are set on the "displaced supersymmetry" model, with pair production of top squarks decaying into an e-mu final state via R-parity-violating interactions. The results are the most restrictive to date on this model, with the most stringent limit being obtained for a top squark lifetime corresponding to ctau = 2 cm, excluding masses below 870 GeV at 95% confidence level. In addition, the previous search for displaced leptons in the e-mu final state using proton-proton collisions produced by the LHC at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse-femtobarns, and the work done during the Long-term Shutdown 1 (LS1) of the LHC to improve this search are included as well.
Stan Durkin (Advisor)
Christopher Hill (Committee Member)
Junko Shigemitsu (Committee Member)
Louis DiMauro (Committee Member)
227 p.

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Citations

  • Liu, B. (2016). Search for displaced leptons in the e-mu final state at the CMS experiment [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1476805042657329

    APA Style (7th edition)

  • Liu, Bingxuan. Search for displaced leptons in the e-mu final state at the CMS experiment. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1476805042657329.

    MLA Style (8th edition)

  • Liu, Bingxuan. "Search for displaced leptons in the e-mu final state at the CMS experiment." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1476805042657329

    Chicago Manual of Style (17th edition)