*John Campbell, Joey Huston, and Frank Krauss*

- Published in print:
- 2017
- Published Online:
- March 2018
- ISBN:
- 9780199652747
- eISBN:
- 9780191749148
- Item type:
- chapter

- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780199652747.003.0005
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology

This chapter centres around the treatment of QCD emissions to all orders. After introductory remarks about the analytic properties of the radiation pattern, some of the most striking phenomenological ...
More

This chapter centres around the treatment of QCD emissions to all orders. After introductory remarks about the analytic properties of the radiation pattern, some of the most striking phenomenological consequences of non-trivial quantum effects, in particular, the angular ordering property of QCD, are highlighted. Next, analytic resummation techniques are considered, expanding on the treatment of transverse momentum resummation from Chapter 2, and introducing the idea of threshold resummation. BFKL resummation, which resums large logarithms emerging in the high-energy limit, is also introduced. In the second part of this chapter, the probabilistic simulation of QCD radiation through the parton shower is discussed. After a detailed introduction to different schemes and algorithms, the discussion of the combination of the parton shower with fixed-order matrix elements beyond the Born approximation is considered, with a discussion of matching with NLO calculations and the merging with multijet matrix elements.Less

This chapter centres around the treatment of QCD emissions to all orders. After introductory remarks about the analytic properties of the radiation pattern, some of the most striking phenomenological consequences of non-trivial quantum effects, in particular, the angular ordering property of QCD, are highlighted. Next, analytic resummation techniques are considered, expanding on the treatment of transverse momentum resummation from Chapter 2, and introducing the idea of threshold resummation. BFKL resummation, which resums large logarithms emerging in the high-energy limit, is also introduced. In the second part of this chapter, the probabilistic simulation of QCD radiation through the parton shower is discussed. After a detailed introduction to different schemes and algorithms, the discussion of the combination of the parton shower with fixed-order matrix elements beyond the Born approximation is considered, with a discussion of matching with NLO calculations and the merging with multijet matrix elements.

*GÜNTHER DISSERTORI, IAN G. KNOWLES, and MICHAEL SCHMELLING*

- Published in print:
- 2009
- Published Online:
- January 2010
- ISBN:
- 9780199566419
- eISBN:
- 9780191708060
- Item type:
- chapter

- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199566419.003.0004
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology

This chapter presents a brief introduction to the modelling of exclusive final states from high-energy collisions between elementary particles. It starts with the matrix element models for the ...
More

This chapter presents a brief introduction to the modelling of exclusive final states from high-energy collisions between elementary particles. It starts with the matrix element models for the initial hard scale and then explains the different ways to treat perturbative higher orders in the parton shower approach, before finally addressing the formation of the final state hadrons. The widely used JETSET, HERWIG, and ARIADNE generators are used as prototypes for illustrating the techniques used to connect QCD with experimental observables.Less

This chapter presents a brief introduction to the modelling of exclusive final states from high-energy collisions between elementary particles. It starts with the matrix element models for the initial hard scale and then explains the different ways to treat perturbative higher orders in the parton shower approach, before finally addressing the formation of the final state hadrons. The widely used JETSET, HERWIG, and ARIADNE generators are used as prototypes for illustrating the techniques used to connect QCD with experimental observables.

*John Campbell, Joey Huston, and Frank Krauss*

- Published in print:
- 2017
- Published Online:
- March 2018
- ISBN:
- 9780199652747
- eISBN:
- 9780191749148
- Item type:
- book

- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780199652747.001.0001
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology

The LHC (Large Hadron Collider) will serve as the energy frontier for high-energy physics for the next 20 years. The highlight of the LHC running so far has been the discovery of the Higgs boson, but ...
More

The LHC (Large Hadron Collider) will serve as the energy frontier for high-energy physics for the next 20 years. The highlight of the LHC running so far has been the discovery of the Higgs boson, but the LHC programme has also consisted of the measurement of a myriad of other Standard Model processes, as well as searches for Beyond-the-Standard-Model physics, and the discrimination between possible new physics signatures and their Standard Model backgrounds. Essentially all of the physics processes at the LHC depend on quantum chromodynamics, or QCD, in the production, or in the decay stages, or in both. This book has been written as an advanced primer for physics at the LHC, providing a pedagogical guide for the calculation of QCD and Standard Model predictions, using state-of-the-art theoretical frameworks. The predictions are compared to both the legacy data from the Tevatron, as well as the data obtained thus far from the LHC, with intuitive connections between data and theory supplied where possible. The book is written at a level suitable for advanced graduate students, and thus could be used in a graduate course, but is also intended for every physicist interested in physics at the LHC.Less

The LHC (Large Hadron Collider) will serve as the energy frontier for high-energy physics for the next 20 years. The highlight of the LHC running so far has been the discovery of the Higgs boson, but the LHC programme has also consisted of the measurement of a myriad of other Standard Model processes, as well as searches for Beyond-the-Standard-Model physics, and the discrimination between possible new physics signatures and their Standard Model backgrounds. Essentially all of the physics processes at the LHC depend on quantum chromodynamics, or QCD, in the production, or in the decay stages, or in both. This book has been written as an advanced primer for physics at the LHC, providing a pedagogical guide for the calculation of QCD and Standard Model predictions, using state-of-the-art theoretical frameworks. The predictions are compared to both the legacy data from the Tevatron, as well as the data obtained thus far from the LHC, with intuitive connections between data and theory supplied where possible. The book is written at a level suitable for advanced graduate students, and thus could be used in a graduate course, but is also intended for every physicist interested in physics at the LHC.