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- PYTHIA, Torbjörn Sjöstrand, +5 authors Emanuel Norrbin
- 2000

Pythia version 6 represents a merger of the Pythia 5, Jetset 7 and SPythia programs, with many improvements. It can be used to generate high-energy-physics 'events', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide… (More)

- Jakob Sternby, Jonas Morwing, Jonas Andersson, Christer Friberg
- Pattern Recognition
- 2009

After a long period of focus on western and Asian scripts there is now a general trend in the on-line handwriting recognition community to explore recognition of other scripts such as Arabic and various Indic scripts. One difficulty with the Arabic script is the number and position of diacritic marks associated to Arabic characters. This paper explores the… (More)

- Jakob Sternby, Christer Friberg
- ICDAR
- 2005

The description of longitudinal photons is far from trivial, and their phe-nomenological importance is largely unknown. While the cross section for direct interactions is calculable, an even more important contribution could come from resolved states. In the development of our model for the interactions of (real and) virtual photons, we have modeled… (More)

- C Friberg, T Sjj
- 1999

The production of jets is studied in collisions of virtual photons, speciically for applications at HERA. Photon ux factors are convoluted with matrix elements involving either direct or resolved photons and, for the latter, with parton distributions of the photon. Special emphasis is put on the range of uncertainty in the modeling of the resolved… (More)

- Christer Friberg
- 1999

A high-energy lepton-lepton collider will give us a unique possibility to study eγ and γγ interactions at high energies. The high-energy photons can be generated by Compton back-scattering of laser light on the high-energy lep-ton beams. With slightly reduced luminosities for eγ and γγ collisions compared to the lepton-lepton collider one, unique and… (More)

- Patrik Ed en, Christer Friberg, Gabriela Miu, Stephen Mrenna
- 2000

- C Friberg, T Sjj
- 1999

We propose a scheme that could ooer a convenient Monte Carlo sampling of next-to-leading-order matrix elements and, at the same time, allow the interfacing of such parton conngurations with a parton-shower approach for the estimation of higher-order eeects. No actual implementation exists so far, so this note should only be viewed as the outline of a… (More)

- C. Friberg
- 1999

The production of jets is studied in collisions of virtual photons, specifically for applications at HERA. Photon flux factors are convoluted with matrix elements involving either direct or resolved photons and, for the latter, with parton distributions of the photon. Special emphasis is put on the range of uncertainty in the modeling of the resolved… (More)

- Christer Friberg
- 2000

A model for total cross sections with virtual photons is presented. In particular γ * p and γ * γ * cross sections are considered. Our approach extends on a model for photoproduction, where the total cross section is subdivided into three distinct event classes: direct, VMD and anomalous. With increasing photon virtuality, the latter two decrease in… (More)