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Search for Signatures of Extra Dimensions in the Diphoton Mass Spectrum with the CMS Detector


Ma, Yousi (2012) Search for Signatures of Extra Dimensions in the Diphoton Mass Spectrum with the CMS Detector. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/X33W-ZX56.


A search for signatures of extra dimensions in the diphoton invariant-mass spectrum has been performed with the Compact Muon Solenoid detector at the Large Hadron Collider. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at √s = 7 TeV corresponding to an intergrated luminosity of 2.2 fb−1. In the context of the Randall–Sundrum model, lower limits are set on the mass of the first graviton excitation in the range of 0.86–1.84 TeV, for values of the associated coupling parameter k ̃between 0.01 and 0.10. Additionally, in the context of the large-extra-dimensions model, lower limits are set on the effective Planck scale in the range of 2.3–3.8 TeV at the 95% confidence level. These are the most restrictive bounds to date.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Extra dimensions; LHC; CMS;
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Newman, Harvey B.
Thesis Committee:
  • Newman, Harvey B. (chair)
  • Patterson, Ryan B.
  • Porter, Frank C.
  • Frautschi, Steven C.
Defense Date:7 May 2012
Record Number:CaltechTHESIS:05182012-101542629
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7046
Deposited By: Yousi Ma
Deposited On:22 May 2012 16:33
Last Modified:03 Oct 2019 23:55

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