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QCD Radiation in Top-Antitop and Z+Jets Final States - Precision Measurements at ATLAS (Hardcover, 2015 ed.)
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QCD Radiation in Top-Antitop and Z+Jets Final States - Precision Measurements at ATLAS (Hardcover, 2015 ed.)
Series: Springer Theses
Expected to ship within 12 - 17 working days
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This thesis contains new research in both experimental and
theoretical particle physics, making important contributions in
each. Two analyses of collision data from the ATLAS experiment at
the LHC are presented, as well as two phenomenological studies of
heavy coloured resonances that could be produced at the LHC. The
first data analysis was the measurement of top quark-antiquark
production with a veto on additional jet activity. As the first
detector-corrected measurement of jet activity in top-antitop
events it played an important role in constraining the theoretical
modelling, and ultimately reduced these uncertainties for ATLAS's
other top-quark measurements by a factor of two. The second data
analysis was the measurement of Z+2jet production and the
observation of the electroweak vector boson fusion (VBF) component.
As the first observation of VBF at a hadron collider, this
measurement demonstrated new techniques to reliably extract VBF
processes and paved the way for future VBF Higgs measurements. The
first phenomenological study developed a new technique for
identifying the colour of heavy resonances produced in
proton-proton collisions. As a by-product of this study an
unexpected and previously unnoticed correlation was discovered
between the probability of correctly identifying a high-energy top
and the colour structure of the event it was produced in. The
second phenomenological study explored this relationship in more
detail, and could have important consequences for the
identification of new particles that decay to top quarks.
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