QCD Radiation in Top-Antitop and Z+Jets Final States : Precision Measurements at ATLAS

QCD Radiation in Top-Antitop and Z+Jets Final States : Precision Measurements at ATLAS


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.

Similar Books

ISBN 10: 3319242180
ISBN 13: 9783319242187

05 Jan 2016
Mikel San-Julian

ISBN 10: 3319273639
ISBN 13: 9783319273631

25 May 2016
J. Michael Millis

ISBN 10: 331918511X
ISBN 13: 9783319185118

01 Jun 2015
Roger Wolf

ISBN 10: 3319202693
ISBN 13: 9783319202693

26 Sep 2015
Vijay Kumar Thakur

ISBN 10: 3030282724
ISBN 13: 9783030282721

28 Nov 2019
Frank J. Borao

ISBN 10: 3030376206
ISBN 13: 9783030376208

07 Mar 2020
Mohamed A. Baky Fahmy

ISBN 10: 3110254948
ISBN 13: 9783110254945

18 Apr 2012
Stefanie Haustein

ISBN 10: 3030078884
ISBN 13: 9783030078881

16 Feb 2019
Michele Anzidei

ISBN 10: 3663199339
ISBN 13: 9783663199335

01 Jan 1969
Herwart Opitz

ISBN 10:
ISBN 13: 9798606620210

30 Jan 2020
Robert Sinclair

ISBN 10: 1623541905
ISBN 13: 9781623541903

24 Aug 2021
Ruth Spiro

ISBN 10: 039333810X
ISBN 13: 9780393338102

16 Nov 2010
Brian Greene