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Title: Measurement of the mass difference between top and anti-top quarksin top pair events from pp collisions at √s = 7 TeV
Author: Chavda, Vikash
ISNI:       0000 0004 2740 8823
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2013
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A measurement of the mass difference between top and anti-top quarks produced in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector at the LHC is presented. The analysis uses the full 2011 data sample, corresponding to an integrated luminosity of 4.7 fb$^{-1}$. An event-by-event mass difference is calculated for every event consistentwith $\ttbar$ production and decay in the semi-leptonic channel.A likelihood fit to the full double $b$-tagged data set yields a measured valueof $\Delta(m) = m_{t}-m_{\bar{t}} = 0.67 \pm{0.61}~(\mathrm{stat.}) \pm{0.19}~(\mathrm{syst.})~\mathrm{GeV}$, consistent with the Standard Model, and more generally, the CPT Theorem, prediction of no mass difference.
Supervisor: Yang, Un-Ki Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available