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Search for Quantum Black Holes with the Horizon Quantum Mechanics Model in Dijet Angular Distributions using ATLAS Detector

  • Author / Creator
    Ni, Haojie
  • Quantum black holes can be described by theories with extra dimensions. Its production at the Large Hadron Collider is studied by both the ATLAS and CMS collaborations but no evidence is found for such states. The lack of evidence may arise from the inaccurate description of models. The horizon quantum mechanics model treats the horizon of a black hole as a quantum object instead of a classic object. This model modification reduces our sensitivity in resonance searches but favours angular searches. This is the first analysis searching for evidence of the horizon quantum mechanics model in dijet angular distributions using data taken with the ATLAS detector. Using data corresponding to an integrated luminosity of 36.2 fb-1 at sqrt(s) = 13 TeV, no significant evidence for a quantum black hole is found. We are able to exclude the parameter space of the horizon quantum mechanics model for MD < 8.0, 7.4 and 6.7 TeV for n = 2, 4 and 6, respectively at 95% confidence level, where MD is the higher dimensional Planck scale and n is the number of extra dimensions. If black holes are not discovered in the ATLAS full Run2 data corresponding to 139 fb-1, we expect to further exclude the parameter space where MD < 8.6, 7.9 and 7.0 TeV for n = 2, 4 and 6, respectively.

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  • Graduation date
    Fall 2021
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.