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We describe the implementation of supersymmetric processes in the HERWIG Monte Carlo event generator. We define relevant parameter and mixing conventions and list the hard scattering matrix elements. Our implementation is based on the…

High Energy Physics - Phenomenology · Physics 2010-04-06 S. Moretti , K. Odagiri , P. Richardson , M. H. Seymour , B. R. Webber

Soft colour exchange models give a unified description of both diffractive and non-diffractive events, such that e-p and p-pbar collider data with and without rapidity gaps are well reproduced. We show that these models also describe the…

High Energy Physics - Phenomenology · Physics 2007-05-23 N. Timneanu , G. Ingelman

The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by…

High Energy Physics - Phenomenology · Physics 2015-06-22 Spyros Argyropoulos , Torbjörn Sjöstrand

The AcerMC Monte Carlo generator is dedicated to the generation of Standard Model background processes which were recognised as critical for the searches at LHC, and generation of which was either unavailable or not straightforward so far.…

High Energy Physics - Phenomenology · Physics 2012-11-15 Borut Paul Kersevan , Elzbieta Richter-Was

We describe a Monte Carlo event generator for the simulation of baryon- and lepton-number violating processes at supercolliders. The package, {\HERBVI}, is designed as a hard-process generator interfacing to the general hadronic event…

High Energy Physics - Phenomenology · Physics 2009-10-28 M. J. Gibbs , B. R. Webber

In the reaction e+e- -> WW -> (q_1 qbar_2)(q_3 qbar_4) the usual hadronization models treat the colour singlets q_1 qbar_2 and q_3 qbar_4 coming from two W bosons independently. However, since the final state partons may coexist in space…

High Energy Physics - Experiment · Physics 2008-11-26 The DELPHI Collaboration , J. Abdallah

Gluon jets with a mean energy of 22 GeV and purity of 95% are selected from hadronic Z0 decay events produced in e+e- annihilations. A subsample of these jets is identified which exhibits a large gap in the rapidity distribution of…

High Energy Physics - Experiment · Physics 2009-11-10 The OPAL collaboration , G. Abbiendi

We introduce soft colour interactions as a novel mechanism to understand the observed events with large rapidity gaps in $ep$ collisions at HERA. Colour exchanges between produced partons and colour-charges in the proton remnant modifies…

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

The transverse momentum ($p_{\rm T}$) spectra of inclusive charged particles and its dependence on charged-particle multiplicity are studied in pp collisions at $\sqrt{s}$ = 7 and 13 TeV using the Monte Carlo event generator PYTHIA Monash.…

High Energy Physics - Phenomenology · Physics 2025-02-04 Pranjal Sarma , Banajit Barman , Buddhadeb Bhattacharjee

We present results obtained with the new Monte Carlo event generator Herwig++. In its first version (1.0), Herwig++ is capable of simulating e+e- Annihilation events. We compare results for different distributions with a vast amount of…

High Energy Physics - Phenomenology · Physics 2007-05-23 Stefan Gieseke

Some of the most arduous and error-prone aspects of precision resummed calculations are related to the partonic hard process, having nothing to do with the resummation. In particular, interfacing to parton-distribution functions, combining…

High Energy Physics - Phenomenology · Physics 2016-09-21 David Farhi , Ilya Feige , Marat Freytsis , Matthew D. Schwartz

We present a new mechanism for the creation of large rapidity gaps in DIS events at HERA. Soft colour interactions between perturbatively produced partons and colour-charges in the proton remnant, modifies the colour structure for…

High Energy Physics - Phenomenology · Physics 2008-02-03 A. Edin , G. Ingelman , J. Rathsman

The modelling of the formation of colour-singlet hadrons from coloured partons, known as Hadronization, is crucial for generating realistic events in Monte Carlo Event Generators. Due to limited understanding of the non-perturbative regime,…

High Energy Physics - Phenomenology · Physics 2025-09-03 Michaela Divisova , Miroslav Myska , Pratixan Sarmah , Andrzej Siódmok

Targeted color-dots with varying shapes and sizes in images are first exhaustively identified, and then their multiscale 2D geometric patterns are extracted for testing spatial uniformness in a progressive fashion. Based on color theory in…

Computer Vision and Pattern Recognition · Computer Science 2021-06-09 Shuting Liao , Li-Yu Liu , Ting-An Chen , Kuang-Yu Chen , Fushing Hsieh

Cosmic rays interacting with the atmosphere allow for the probing of fundamental interactions at ultra-high energies. We thus obtain limits on strongly coupled new physics models via their imprints on cosmic-ray air showers. Using the Monte…

High Energy Physics - Phenomenology · Physics 2019-11-11 Peter Schichtel , Michael Spannowsky , Philip Waite

We extend our Monte Carlo generator of global configurations in nuclei to include different spatial distributions of protons and neutrons in heavy nuclei taking into account the difference of spatial correlations between two protons, two…

High Energy Physics - Phenomenology · Physics 2019-09-04 Massimiliano Alvioli , Mark Strikman

High Energy Physics processes, such as hard scattering, parton shower, and hadronization, occur at colliders around the world, e.g., the Large Hadron Collider in Europe. The various steps are also components within corresponding Monte-Carlo…

High Energy Physics - Phenomenology · Physics 2022-07-29 Leyun Gao , Jing Peng , Zilin Dai , Sitian Qian , Tao Li , Qiang Li , Meng Lu

A novel hybrid Monte Carlo transport scheme is demonstrated in a scene with solar illumination, scattering and absorbing 2D atmosphere, a textured reflecting mountain, and a small detector located in the sky (mounted on a satellite or a…

Mathematical Physics · Physics 2015-05-28 Guillaume Bal , Anthony Davis , Ian Langmore

A new release of the Monte Carlo program Herwig++ (version 2.1) is now available. This version includes a number of significant improvements including: an eikonal multiple parton-parton scattering model of the underlying event; the…

High Energy Physics - Phenomenology · Physics 2007-11-21 M. Bahr , S. Gieseke , M. Gigg , D. Grellscheid , K. Hamilton , O. Latunde-Dada , S. Platzer , P. Richardson , M. H. Seymour , A. Sherstnev , B. R. Webber

A fast, simple to use Monte Carlo based event generator is presented which is intended to facilitate simulation studies and the development of analysis software for the Solenoidal Tracker at RHIC (Relativistic Heavy Ion Collider) (STAR)…

Nuclear Experiment · Physics 2007-05-23 R. L. Ray , R. S. Longacre