Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Petros Draggiotis is active.

Publication


Featured researches published by Petros Draggiotis.


Physics Letters B | 1998

On the computation of multigluon amplitudes

Petros Draggiotis; Ronald Kleiss; Costas G. Papadopoulos

Abstract A computational algorithm based on recursive equations is developed in order to estimate multigluon production processes at high energy hadron colliders. The partonic reactions gg→(n−2) g with n≤9 are studied and comparisons with known approximations are presented.A computational algorithm based on recursive equations is developed in order to estimate multigluon production processes at high energy hadron colliders. The partonic reactions gg->(n-2)g with n up to n=9 are studied and comparisons with known approximations are presented.


European Physical Journal C | 2002

Multi-jet production in hadron collisions

Petros Draggiotis; Ronald Kleiss; Costas G. Papadopoulos

Abstract. The advent of high-energy hadron colliders necessitates efficient and accurate computation of multi-jet production processes, both as QCD processes in their own right and as backgrounds for other physics. The algorithm that performs these tasks and a brief numerical study of multi-jet processes are presented.


Physics Letters B | 2000

SARGE: An Algorithm for generating QCD antennas

André van Hameren; Ronald Kleiss; Petros Draggiotis

Abstract We present an algorithm to generate any number of random massless momenta in phase space, with a distribution that contains the kinematical pole structure that is typically found in multi-parton QCD-processes. As an application, we calculate the cross-section of some e + e − →partons processes, and compare SARGE s performance with that of the uniform-phase space generator RAMBO .


European Physical Journal C | 2006

Diagrammatic proof of the BCFW recursion relation for gluon amplitudes in QCD

Petros Draggiotis; Ronald Kleiss; Achilleas Lazopoulos; Costas G. Papadopoulos

We present a proof of the Britto–Cachazo–Feng–Witten tree-level recursion relation for gluon amplitudes in QCD, based on a direct equivalence between BCFW decompositions and Feynman diagrams. We demonstrate that this equivalence can be made explicit when working in a convenient gauge. We exhibit that gauge invariance and the particular structure of Yang–Mills vertices guarantee the validity of the BCFW construction.


arXiv: High Energy Physics - Phenomenology | 2006

Recursive equations for arbitrary scattering processes

Petros Draggiotis; A. van Hameren; Ronald Kleiss; Achilleas Lazopoulos; Costas G. Papadopoulos; Malgorzata Worek

The usefulness of recursive equations to compute scattering matrix elements for arbitrary processes is discussed. Explicit results at tree and one-loop order, obtained by the HELAC/PHEGAS package that is based on the Dyson-Schwinger recursive equations approach, are briefly presented.


European Physical Journal C | 2002

Counting tree diagrams: asymptotic results for QCD-like theories

Petros Draggiotis; Ronald Kleiss

Abstract We discuss the enumeration of Feynman diagrams at tree order for processes with external lines of different types. We show how this can be done by iterating algebraic Schwinger–Dyson equations. Asymptotic estimates for very many external lines are derived. Applications include QED, QCD and scalar QED, and the asymptotic estimates are numerically confronted with the exact results.


European Physical Journal C | 2003

Vertex counting: Statistical distribution of vertices in large sets of tree diagrams

Petros Draggiotis; Ronald Kleiss

Abstract. We study the problem of determining the distribution of vertices of a particular given type in the set of all Feynman tree graphs in quantum field theories. We show that in almost all cases a Gaussian distribution arises asymptotically, and we compute the mean and variance of this distribution for several theories. We show that the distributions ”fine structure”, arising from topological sum rules, can be obtained.


European Physical Journal C | 2000

Parton counting: physical and computational complexity of multi-jet production at hadron colliders

Petros Draggiotis; Ronald Kleiss

Abstract. We present an enumeration of all possible amplitudes that contribute to an n-jet process in QCD. We estimate the number of amplitudes for large number of jets and determine the actual number of amplitudes to be calculated, which is smaller due to relabelling among (massless) quark flavours.


European Physical Journal C | 2003

Recursive actions for scalar theories

Chris Dams; Ronald Kleiss; Petros Draggiotis; E.N. Argyres; A. van Hameren; Costas G. Papadopoulos

Abstract. We introduce a class of self-interacting scalar theories in which the various coupling constants obey a recursive relation. These imply a particularly simple form for the generating function of the Feynman amplitudes with vanishing external momenta, as well as for the effective potential. In addition we discuss an interesting duality inherent in these models. Specializing to the case of zero spacetime dimensions we find intriguing nullification properties for the amplitudes.


Proceedings of Light Cone 2010: Relativistic Hadronic and Particle Physics — PoS(LC2010) | 2010

Feynman's Tree Theorem and Loop-Tree Dualities

Isabella Bierenbaum; Petros Draggiotis; German Rodrigo; Stefano Catani

We discuss the duality theorem, which provides a relation between loop integrals and phase space integrals. We rederive the duality relation for the one-loop case and extend it to two and higher-order loops. We explicitly show its application to two- and three-loop scalar master integrals and discuss the structure of the occurring cuts.

Collaboration


Dive into the Petros Draggiotis's collaboration.

Top Co-Authors

Avatar

Ronald Kleiss

Radboud University Nijmegen

View shared research outputs
Top Co-Authors

Avatar

Costas G. Papadopoulos

National and Kapodistrian University of Athens

View shared research outputs
Top Co-Authors

Avatar

A. van Hameren

Radboud University Nijmegen

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

André van Hameren

Radboud University Nijmegen

View shared research outputs
Top Co-Authors

Avatar

Chris Dams

Radboud University Nijmegen

View shared research outputs
Top Co-Authors

Avatar

G. Chachamis

Autonomous University of Madrid

View shared research outputs
Researchain Logo
Decentralizing Knowledge