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Jet Physics at High Energy Colliders.

Chien, Yang-Ting.

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Jet Physics at High Energy Colliders.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Jet Physics at High Energy Colliders./
Author:	Chien, Yang-Ting.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2013,
Description:	149 p.
Notes:	Source: Dissertations Abstracts International, Volume: 75-06, Section: B.
Contained By:	Dissertations Abstracts International75-06B.
Subject:	Particle physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600146
ISBN:	9781303501531

Jet Physics at High Energy Colliders.
Chien, Yang-Ting.

Jet Physics at High Energy Colliders. - Ann Arbor : ProQuest Dissertations & Theses, 2013 - 149 p.

Source: Dissertations Abstracts International, Volume: 75-06, Section: B.

Thesis (Ph.D.)--Harvard University, 2013.

This item must not be sold to any third party vendors.

The future of new physics searches at the LHC will be to look for hadronic signals with jets. In order to distinguish a hadronic signal from its background, it is important to develop advanced collider physics techniques that make accurate theoretical predictions. This work centers on phenomenological and formal studies of Quantum Chromodynamics (QCD), including resummation of hadronic observables using Soft Collinear Effective Theory (SCET), calculating anomalous dimensions of multi-Wilson line operators in AdS, and improving jet physics analysis using multiple event interpretations. Hadronic observables usually involve physics at different energy scales, and the calculations depend on large logarithms of the energy ratios. We can prove factorization theorems of observables and resum large logarithms using renormalization-group techniques. The heavy jet mass distribution for e +e- collisions is calculated at next-to-next-to-next-to leading logarithmic order (N3LL), and we measure the strong coupling constant at 0.3% accuracy. We also calculate the jet-mass distribution at partial N2LL in γ + jet events at the LHC. The effect of non-global logarithms in resummation estimated, and it is significant only at the peak region. Soft QCD interactions among jets can be described by multi-Wilson line operators, with each Wilson line pointing along one of the jet directions. The anomalous dimensions of these operators are key for higher-order resummation. We study these operators using radial quantization and conformal gauge, which leads to a drastic simplification of the two-loop anomalous dimension calculation. We also find that the anomalous dimension calculation is closely related to a corresponding Witten diagram calculation. Jets are complicated objects to identify in high energy collider experiments. A single interpretation of each event can only extract a limited amount of information. We propose telescoping jet algorithms which give multiple event interpretations by varying the parameter R in the jet definition. We can redefine the weight of each event in a counting experiment to be the fraction of interpretations passing the experimental cuts, and we get a 46% improvement in the statistical significance for the Higgs search with an associated Z boson at the 8 TeV LHC.

ISBN: 9781303501531Subjects--Topical Terms:

3433269
Particle physics.

Jet Physics at High Energy Colliders.
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500 $a Source: Dissertations Abstracts International, Volume: 75-06, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
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502 $a Thesis (Ph.D.)--Harvard University, 2013.
506 $a This item must not be sold to any third party vendors.
520 $a The future of new physics searches at the LHC will be to look for hadronic signals with jets. In order to distinguish a hadronic signal from its background, it is important to develop advanced collider physics techniques that make accurate theoretical predictions. This work centers on phenomenological and formal studies of Quantum Chromodynamics (QCD), including resummation of hadronic observables using Soft Collinear Effective Theory (SCET), calculating anomalous dimensions of multi-Wilson line operators in AdS, and improving jet physics analysis using multiple event interpretations. Hadronic observables usually involve physics at different energy scales, and the calculations depend on large logarithms of the energy ratios. We can prove factorization theorems of observables and resum large logarithms using renormalization-group techniques. The heavy jet mass distribution for e +e- collisions is calculated at next-to-next-to-next-to leading logarithmic order (N3LL), and we measure the strong coupling constant at 0.3% accuracy. We also calculate the jet-mass distribution at partial N2LL in γ + jet events at the LHC. The effect of non-global logarithms in resummation estimated, and it is significant only at the peak region. Soft QCD interactions among jets can be described by multi-Wilson line operators, with each Wilson line pointing along one of the jet directions. The anomalous dimensions of these operators are key for higher-order resummation. We study these operators using radial quantization and conformal gauge, which leads to a drastic simplification of the two-loop anomalous dimension calculation. We also find that the anomalous dimension calculation is closely related to a corresponding Witten diagram calculation. Jets are complicated objects to identify in high energy collider experiments. A single interpretation of each event can only extract a limited amount of information. We propose telescoping jet algorithms which give multiple event interpretations by varying the parameter R in the jet definition. We can redefine the weight of each event in a counting experiment to be the fraction of interpretations passing the experimental cuts, and we get a 46% improvement in the statistical significance for the Higgs search with an associated Z boson at the 8 TeV LHC.
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