11 research outputs found
Hard Interactions of Quarks and Gluons: a Primer for LHC Physics
In this review article, we develop the perturbative framework for the
calculation of hard scattering processes. We undertake to provide both a
reasonably rigorous development of the formalism of hard scattering of quarks
and gluons as well as an intuitive understanding of the physics behind the
scattering. We emphasize the importance of logarithmic corrections as well as
power counting of the strong coupling constant in order to understand the
behavior of hard scattering processes. We include "rules of thumb" as well as
"official recommendations", and where possible seek to dispel some myths.
Experiences that have been gained at the Fermilab Tevatron are recounted and,
where appropriate, extrapolated to the LHC.Comment: 118 pages, 107 figures; to be published in Reports on Progress in
Physic
Weak corrections and high Et jets at the Fermilab Tevatron
We calculate one-loop (purely) weak (W) corrections of [script O](alphaS2alphaW) to the partonic cross section of two jets at Tevatron and prove that they can be larger than the tree-level [script O](alphaSalphaEW) and [script O](alphaEW2) electroweak (EW) ones. At high transverse energy of the jets, all such corrections may lead to detectable effects of, e.g., -10% or so, with respect to the leading-order (LO) QCD term of [script O](alphaS2), for the highest value so far probed by Run 2, depending on the factorization/renormalization scale. Besides, they increase significantly with jet transverse energy. Hence, our results show that EW corrections may be needed to fit the standard model (SM) to present and future Tevatron jet data.<br/
Les Houches Physics at TeV Colliders 2005, Standard Model and Higgs Working Group: Summary Report.
This Report summarises the activities of the "SM and Higgs" working group for
the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005.
On the one hand, we performed a variety of experimental and theoretical studies
on standard candles (such as W, Z, and ttbar production), treating them either
as proper signals of known physics, or as backgrounds to unknown physics; we
also addressed issues relevant to those non-perturbative or semi-perturbative
ingredients, such as Parton Density Functions and Underlying Events, whose
understanding will be crucial for a proper simulation of the actual events
taking place in the detectors. On the other hand, several channels for the
production of the Higgs, or involving the Higgs, have been considered in some
detail. The report is structured into four main parts. The first one deals with
Standard Model physics, except the Higgs. A variety of arguments are treated
here, from full simulation of processes constituting a background to Higgs
production, to studies of uncertainties due to PDFs and to extrapolations of
models for underlying events, from small- issues to electroweak corrections
which may play a role in vector boson physics. The second part of the report
treats Higgs physics from the point of view of the signal. In the third part,
reviews are presented on the current status of multi-leg, next-to-leading order
and of next-to-next-to-leading order QCD computations. Finally, the fourth part
deals with the use of Monte Carlos for simulation of LHC physics.Comment: 234 pages, 173 figures. Web page of the workshop (with links to the
talks): http://lappweb.in2p3.fr/conferences/LesHouches/Houches2005