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UBC Theses and Dissertations

Measuring the velocity and mass of stable massive particles using the ATLAS detector at the LHC Mills, William


A generic search for new detector-stable high-mass particles at the LHC using the ATLAS detector is conducted, by measuring the velocity of candidate tracks in ATLAS’ Inner Detector. Four novel new velocity estimation techniques are developed, the best of which achieve velocity resolutions of better than 8% in simulation. 2.8 fb⁻¹ of 2011 ATLAS data is analyzed via these methods, yielding no significant signal for new stable massive particles at the sub-TeV scale, and an exclusion limit at the 95% confidence level for the existence of generic stable massive gluinos below a mass of 665 GeV.

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