Publications (17)
Hadronization
Bryan Webber
Hadronization corrections to the predictions of perturbative QCD are reviewed. The existing models for the conversion of quarks and gluons into hadrons are summarized. The most suc…
Polynomials, Riemann surfaces, and reconstructing missing-energy events
Ben Gripaios, Kazuki Sakurai, Bryan Webber
We consider the problem of reconstructing energies, momenta, and masses in collider events with missing energy, along with the complications introduced by combinatorial ambiguities…
Effects of invisible particle emission on global inclusive variables at hadron colliders
Andreas Papaefstathiou, Bryan Webber
We examine the effects of invisible particle emission in conjunction with QCD initial state radiation (ISR) on quantities designed to probe the mass scale of new physics at hadron…
Probing the Colour Structure of the Top Quark Forward-Backward Asymmetry
Ben Gripaios, Andreas Papaefstathiou, Bryan Webber
We point out that QCD coherence effects can help to identify the colour structure of possible new physics contributions to the anomalously large forward-backward asymmetry in top q…
Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
Andreas Papaefstathiou, Bryan Webber
We examine the effects of QCD initial-state radiation on a class of quantities, designed to probe the mass scale of new physics at hadron colliders, which involve longitudinal as w…
Next-to-Leading-Order Event Generators
Paolo Nason, Bryan Webber
We review the methods developed for combining the parton shower approximation to QCD with fixed-order perturbation theory, in such a way as to achieve next-to-leading-order (NLO) a…
Monte Carlo event generators for high energy particle physics event simulation
Andy Buckley, Frank Krauss, Simon Plätzer +40
Monte Carlo event generators (MCEGs) are the indispensable workhorses of particle physics, bridging the gap between theoretical ideas and first-principles calculations on the one h…
New formalism for QCD parton showers
Stefan Gieseke, Philip Stephens, Bryan Webber
We present a new formalism for parton shower simulation of QCD jets, which incorporates the following features: invariance under boosts along jet axes, improved treatment of heavy…
Reconstruction of Higgs bosons in the di-tau channel via 3-prong decay
Ben Gripaios, Keiko Nagao, Mihoko Nojiri +2
We propose a method for reconstructing the mass of a particle, such as the Higgs boson, decaying into a pair of tau leptons, of which one subsequently undergoes a 3-prong decay. Th…
Mass determination in sequential particle decay chains
Bryan Webber
A simple method is proposed for determining the masses of new particles in collider events containing a pair of decay chains (not necessarily identical) of the form Z -> Y+1, Y ->…
General-purpose event generators for LHC physics
Andy Buckley, Jonathan Butterworth, Stefan Gieseke +12
We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topi…
Black Holes at Accelerators
Bryan Webber
In theories with large extra dimensions and TeV-scale gravity, black holes are copiously produced in particle collisions at energies well above the Planck scale. I briefly review s…
A Positive-Weight Next-to-Leading-Order Monte Carlo for e+e- Annihilation to Hadrons
Oluseyi Latunde-Dada, Stefan Gieseke, Bryan Webber
We apply the positive-weight Monte Carlo method of Nason for simulating QCD processes accurate to Next-To-Leading Order to the case of e+e- annihilation to hadrons. The method enta…
Herwig++ 1.0: An Event Generator for e+e- Annihilation
Stefan Gieseke, Alberto Ribon, Michael H Seymour +2
Results from the new Monte Carlo event generator Herwig++ are presented. This first version simulates Hadron Emission Reactions With Interfering Gluons in electron-positron annihil…
Direct numerical evaluation of multi-loop integrals without contour deformation
Roberto Pittau, Bryan Webber
We propose a method for computing numerically integrals defined via deformations acting on single-pole singularities. We achieve this without an explicit analytic contour de…
QCD Jet Rates with the Inclusive Generalized kt Algorithms
Erik Gerwick, Ben Gripaios, Steffen Schumann +1
We derive generating functions, valid to next-to-double logarithmic accuracy, for QCD jet rates according to the inclusive forms of the kt, Cambridge/Aachen and anti-kt algorithms,…
Searching for third-generation composite leptoquarks at the LHC
Ben Gripaios, Andreas Papaefstathiou, Kazuki Sakurai +1
Fermion masses may arise via mixing of elementary fermions with composite fermions of a strong sector in scenarios of strongly-coupled electroweak symmetry breaking. The strong sec…