11 research outputs found
Electroweak vector boson production in joint resummation
We study the application of the joint resummation to electroweak boson
production at hadron colliders. The joint resummation formalism resums both
threshold and transverse momentum corrections to the transverse momentum
distribution at next-to-leading logarithmic accuracy. We obtain a good
description of the transverse momentum distribution of Z bosons produced at the
Tevatron collider.Comment: 5 pages, 2 figures. Talk presented by A. Kulesza at the XXXVIIth
Rencontres de Moriond `QCD and high energy hadronic interactions', Les Arcs,
Franc
The resummed Higgs boson transverse momentum distribution at the LHC
We apply QCD resummation techniques to study the transverse momentum
distribution of Higgs bosons produced via gluon-gluon fusion at the LHC. In
particular we focus on the joint resummation formalism which resums both
threshold and transverse momentum corrections simultaneously. A comparison of
results obtained in the joint and the standard recoil resummation frameworks is
presented.Comment: 9 pages, 1 figure, uses appolb.cls. Contribution to the Proceedings
of XXVII International Conference of Theoretical Physics, Ustron, Poland,
September 15-21, 2003. To appear in Acta Physica Polonica
Phenomenological studies in QCD resummation
We study applications of QCD soft-gluon resummations to electroweak
annihilation cross sections. We focus on a formalism that allows to resum
logarithmic corrections arising near partonic threshold and at small transverse
momentum simultaneously.Comment: 7 pages, LaTeX, 3 figures as eps files. Talk presented by W.
Vogelsang at the "XVI International Conference on Particles and Nuclei
(PaNic02)", Osaka, Japan, September 200
Production of Scalar Higgs Bosons Associated with Boson at the CERN LHC in the MSSM
We investigate the associated production of a scalar Higgs boson ( or
) with boson in the minimal supersymmetric extension of the standard
model (MSSM) at the CERN Large Hadron Collider (LHC), including the
contributions from annihilation at the tree level and gluon fusion
via quark and squark loops. We quantitatively analyze the total cross sections
in the mSUGRA scenario. For the production of associated with , we
find that in most of the parameter regions, the contributions from initial
and are at a level of one percent of the total cross section
and therefore almost insignificant. For the production of associated with
, the contributions from channel can be much larger than those
from light quark initial states. Especially for large , the
increment can reach about one order of magnitude. Thus, when considering the
associated production of and at the LHC, the contributions from
annihilation should be taken into account seriously.Comment: 19 pages, 8 figures, RevTeX4; one reference added, minor changes,
conclusion unchanged; Journal-ref adde
Joint resummation in electroweak boson production
We present a phenomenological application of the joint resummation formalism
to electroweak annihilation processes at measured boson momentum Q_T. This
formalism simultaneously resums at next-to-leading logarithmic accuracy large
threshold and recoil corrections to partonic scattering. We invert the impact
parameter transform using a previously described analytic continuation
procedure. This leads to a well-defined, resummed perturbative cross section
for all nonzero Q_T, which can be compared to resummation carried out directly
in Q_T space. From the structure of the resummed expressions, we also determine
the form of nonperturbative corrections to the cross section and implement
these into our analysis. We obtain a good description of the transverse
momentum distribution of Z bosons produced at the Tevatron collider.Comment: 27 pages, LaTeX, 8 figures as eps files. Some additions to earlier
version, this version as published in Phys. Rev. D66 (2002) 01401
The QCD/SM Working Group: Summary Report
This Report documents the results obtained by the Working Group on Quantum
ChromoDynamics and the Standard Model for the Workshop ``Physics at TeV
Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of
uncertainties in Parton Distribution Functions is reviewed. Progresses in the
description of multiparton final states at Next-to-Leading Order and the
extension of calculations for precision QCD observables beyond this order are
summarized. Various issues concerning the relevance of resummation for
observables at TeV colliders is examined. Improvements to algorithms of jet
reconstruction are discussed and predictions for diphoton and photon pi-zero
production at the LHC are made for kinematic variables of interest regarding
searches for a Higgs boson decaying into two photons. Finally, several
improvements implemented in Monte-Carlo event generators are documented
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
The QCD/SM working group: summary report
This Report documents the results obtained by the Working Group on Quantum ChromoDynamics and the Standard Model for the Workshop "Physics at TeV Colliders", Les Houches, France, 21 May - 1 June 2001. The account of uncertainties in Parton Distribution Functions is reviewed. Progresses in the description of multiparton final states at Next-to-Leading Order and the extension of calculations for precision QCD observables beyond this order are summarized. Various issues concerning the relevance of resummation for observables at TeV colliders is examined. Improvements to algorithms of jet reconstruction are discussed and predictions for diphoton and photon pi-zero production at the LHC are made for kinematic variables of interest regarding searches for a Higgs boson decaying into two photons. Finally, several improvements implemented in Monte-Carlo event generators are documented
The QCD/SM working group: summary report
This Report documents the results obtained by the Working Group on Quantum ChromoDynamics and the Standard Model for the Workshop "Physics at TeV Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of uncertainties in Parton Distribution Functions is reviewed. Progresses in the description of multiparton final states at Next-to-Leading Order and the extension of calculations for precision QCD observables beyond this order are summarized. Various issues concerning the relevance of resummation for observables at TeV colliders is examined. Improvements to algorithms of jet reconstruction are discussed and predictions for diphoton and photon pi-zero production at the LHC are made for kinematic variables of interest regarding searches for a Higgs boson decaying into two photons. Finally, several improvements implemented in Monte-Carlo event generators are documented