421 research outputs found
Status of QCD
In this talk, I review recent developments in perturbative QCD and their
applications to collider physics.Comment: Plenary talk presented at XVIII International Workshop on
Deep-Inelastic Scattering and Related Subjects, DIS 2010, April 2010,
Firenze, Italy; v2: typos corrected, references adde
NNLO Antenna Subtraction with One Hadronic Initial State
In this talk we present the extension of the antenna subtraction method to
include initial states containing one hadron at NNLO. We sketch the
requirements for the different necessary subtraction terms, and we explain how
the antenna functions are integrated over the appropriate phase space by
reducing the integrals to a small set of master integrals. Where applicable,
our results for the integrated antennae were cross-checked against the known
NNLO coefficient functions for deep inelastic scattering processes.Comment: 6 pages, 1 figure. Talk given at RADCOR 2009 - 9th International
Symposium on Radiative Corrections (Applications of Quantum Field Theory to
Phenomenology) October 25 - 30 200
Automation of the Dipole Subtraction Method in MadGraph/MadEvent
We present the implementation of the dipole subtraction formalism for the
real radiation contributions to any next-to-leading order QCD process in the
MadGraph/MadEvent framework. Both massless and massive dipoles are considered.
Starting from a specific (n+1)-particle process the package provides a Fortran
code for all possible dipoles to all Born processes that constitute the
subtraction term to the (n+1)-particle process. The output files are given in
the usual "MadGraph StandAlone" style using helicity amplitudes.Comment: 14 pages, 4 figure
Hadronic final states in DIS with Sherpa
We present an extension of the multi-purpose Monte-Carlo event generator
Sherpa for processes in deeply inelastic lepton-nucleon scattering. Hadronic
final states in this kinematical setting are characterised by the presence of
multiple kinematical scales, which were up to now accounted for only by
specific resummations in individual kinematical regions. An extension of a
known method for merging truncated parton showers with higher-order tree-level
matrix elements allows to obtain predictions which are reliable in all
kinematical limits.Comment: 5 pages, 3 figures; Contribution to the XVIII International Workshop
on Deep-Inelastic Scattering and Related Subjects, April 19-23, 2010,
Firenze, Ital
Integrated dipoles with MadDipole in the MadGraph framework
Heading towards a full automation of next-to-leading order (NLO) QCD
corrections, one important ingredient is the analytical integration over the
one-particle phase space of the unresolved particle that is necessary when
adding the subtraction terms to the virtual corrections. We present the
implementation of these integrated dipoles in the MadGraph framework. The
result is a package that allows an automated calculation for the NLO real
emission parts of an arbitrary process.Comment: 22 pages, 1 figure. Published version: few reference updates and a
couple of minor corrections to the tex
- …