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The Monte Carlo event generator PHOKHARA, which simulates hadron and muon production at electron-positron colliders through radiative return, has been extended to final states with three pions. A model for the form factor based on…

High Energy Physics - Phenomenology · Physics 2009-01-07 Henryk Czyz , Agnieszka Grzelinska , Johann H. Kuhn , German Rodrigo

Single and multi-photon events with missing energy are analysed using data collected with the L3 detector at LEP at a centre-of-mass energy of 189 GeV, for a total of 176 pb^{-1} of integrated luminosity. The cross section of the process…

High Energy Physics - Experiment · Physics 2012-08-27 L3 Collaboration

We present a novel saturation and leading order collinear factorization based Monte-Carlo implementation of the EKRT model for computing QCD matter initial states in high-energy nuclear collisions. As new features the MC implementation…

High Energy Physics - Phenomenology · Physics 2025-10-31 Harri Niemi , Jussi Auvinen , Kari J. Eskola , Henry Hirvonen , Yuuka Kanakubo , Mikko Kuha

We present precision calculations of the processes e+ e- -> 4-fermions in which the double resonant W+ W- and ZZ intermediate states occur. Referring to these latter intermediate states as the 'signal processes', we show that, by using the…

High Energy Physics - Phenomenology · Physics 2016-08-15 B. F. L. Ward , S. Jadach , W. Płaczek , M. Skrzypek , Z. Wcas

We realize, by Monte Carlo event generator methods, the exact O}(\alpha)$ YFS exponentiated calculation of $e^+e^- \to W^+ W^- (\to f_1\bar f'_1 + \bar f_2 f'_2)$ at and beyond LEP2 energies, where the left-handed parts of $f_i$ and $f'_i$…

High Energy Physics - Phenomenology · Physics 2009-10-30 S. Jadach , W. Placzek , M. Skrzypek , B. F. L. Ward , Z. Was

A new implementation of the POWHEG method into the Monte-Carlo event generator Sherpa is presented, focusing on processes with a simple colour structure. Results for a variety of processes, namely e+e- to hadrons, deep-inelastic…

High Energy Physics - Phenomenology · Physics 2011-05-18 Stefan Hoeche , Frank Krauss , Marek Schonherr , Frank Siegert

Luminosity monitoring at $e^+e^-$ colliders is investigated using SANC Monte Carlo event generator ReneSANCe and integrator MCSANC for simulation of Bhabha scattering at low angles. Results are presented for center-of-mass energies of the Z…

High Energy Physics - Phenomenology · Physics 2023-12-25 A. B. Arbuzov , S. G. Bondarenko , I. R. Boyko , L. V. Kalinovskaya , A. A. Kampf , R. R. Sadykov , V. L. Yermolchyk

We use the theory of Yennie, Frautschi and Suura to realize, via Monte Carlo methods, the process $f\,\bbbarf\to f'\,\bbbarf'+n\gamma$ at SSC and LHC energies, where $f$ and $f'$ are quarks or leptons. QED infrared divergences are canceled…

High Energy Physics - Phenomenology · Physics 2009-10-22 D. B. DeLaney , S. Jadach , Ch. Shio , G. Siopsis , B. F. L. Ward

In neutrinoless double beta (0{\nu}{\beta}{\beta}) decay experiments, the diversity of topological signatures of different particles provides an important tool to distinguish double beta events from background events and reduce background…

Instrumentation and Detectors · Physics 2021-09-03 Ming Zeng , Tenglin Li , Jirong Cang , Zhi Zeng , Jianqiang Fu , Weihe Zeng , Jianping Cheng , Hao Ma , Yinong Liu

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. Topics included are: the generation of hard-scattering matrix…

This manual describes version 2.2 of the Monte Carlo event generator UNIBAB for large angle Bhabha scattering at LEP and SLC. UNIBAB implements higher order electromagnetic radiative corrections and the effects of soft photon exponentiation…

High Energy Physics - Experiment · Physics 2007-05-23 H. Anlauf , H. D. Dahmen , P. Manakos , T. Ohl

We present a new implementation of photoproduction processes in e+e- and ep collisions into Pythia 8 Monte-Carlo event-generator. In particular we discuss how the parton showers and multiparton interactions are generated with a resolved…

High Energy Physics - Phenomenology · Physics 2017-09-01 Ilkka Helenius

To improve the accuracy of the e+e- -> pi+pi-gamma Radiative Return method, one has to control the theoretical uncertainty of the final-state photon emission. It is of particular importance at DAPHNE for the analysis, where cuts are relaxed…

High Energy Physics - Phenomenology · Physics 2010-09-21 S. Ivashyn , H. Czyz , A. Korchin

We describe the multi-purpose Monte-Carlo event generator WHIZARD for the simulation of high-energy particle physics experiments. Besides the presentation of the general features of the program like SM physics, BSM physics, and QCD effects,…

High Energy Physics - Phenomenology · Physics 2014-10-17 J. Reuter , F. Bach , B. Chokoufe Nejad , W. Kilian , T. Ohl , M. Sekulla , C. Weiss

ISAJET is a Monte Carlo event generator for $pp$, $\bar pp$, and $e^+e^-$ interactions at high energies. This document summarizes the physics underlying the program and describes how to use it.

High Energy Physics - Phenomenology · Physics 2007-05-23 H. Baer , F. E. Paige , S. D. Protopopescu , X. Tata

The number of events suitable for a determination of the gluon distribution function g(x,Q^2) in a proton at the LHC for various intervals of x and Q^2 are estimated. The contributions of main background sources to ``direct photon+jet''…

High Energy Physics - Experiment · Physics 2007-05-23 D. Bandurin , N. Skachkov

Highly reliable Monte-Carlo event generators and detector simulation programs are important for the precision measurement in the high energy physics. Huge amounts of computing resources are required to produce a sufficient number of…

High Energy Physics - Experiment · Physics 2021-02-24 Suyong Choi , Jae Hoon Lim

A program to simulate the production of heavy quarks through the boson-gluon fusion process in $e^{\pm}p$ collisions is presented. The full electro\-weak structure of the electron--gluon interaction is taken into account as well as the…

High Energy Physics - Phenomenology · Physics 2009-10-28 G. Ingelman , J. Rathsman , G. A. Schuler

We present a partonic Monte Carlo event generator that can be used for calculating the group independent kinematical functions of any infrared safe four-jet observable at NLO accuracy. As an example, we calculate the differential…

High Energy Physics - Phenomenology · Physics 2009-10-30 Zoltan Nagy , Zoltan Trocsanyi

Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at…