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Title: Search for long-lived supersymmetry in final states with jets and missing energy in the CMS detector
Author: Laner Ogilvy, Christian
ISNI:       0000 0004 7427 7723
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2018
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An inclusive search for supersymmetry in final states with jets and missing transverse momentum is performed in proton-proton collisions at a centre-of-mass energy of 13 TeV. A data sample with an integrated luminosity of 35.9 fb-1 recorded by the CMS detector in 2016 at the CERN LHC is analysed. The observed signal candidate event counts are found to be in agreement with the standard model expectation. Within the context of simplified models, the masses of promptly decaying bottom, top and mass-degenerate light-flavour squarks are excluded at 95% confidence level up to 1050, 1000 and 1325 GeV, respectively. The gluino mass is excluded up to 1900, 1650 and 1650 GeV for a gluino decaying promptly via the aforementioned squarks. The result is also interpreted in the context of simplified models of split supersymmetry. Lower limits are placed on the mass of a long-lived gluino for a wide range of lifetimes. Gluino masses up to 1750 and 900 GeV are excluded for gluinos with a lifetime of 1 mm and metastable gluinos, respectively. These results provide complementary coverage to dedicated searches for long-lived particles at the LHC.
Supervisor: Buchmueller, Oliver Sponsor: Science and Technology Facilities Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral