GoSam is hosted by Hepforge, IPPP Durham

Tip 02.6.2017: GoSam 2.0.4 released, changes

Synopsis

The package GoSam allows for the automated calculation of one-loop amplitudes for multi-particle processes in renormalizable quantum field theories. The amplitudes, which are generated in terms of Feynman diagrams, can be reduced using either D-dimensional integrand-level decomposition or by tensor reduction. GoSam can be used to calculate one-loop QCD and/or electroweak corrections to Standard Model processes and offers the flexibility to link model files for theories Beyond the Standard Model. A standard interface (BLHA1, BLHA2) to programs calculating real radiation is also implemented.

Installation

Download the install script and run it with python gosam_installer.py.

For more information see the installation documentation.

If you want to use GoSam 1.0 input cards, try the Input card converter.

Documentation

We refer to the GoSam-2.0 manual. The manual also contains a BLHA-HowTo in section 7.

GoSam Collaboration

Former members: Gavin Cullen, Hans van Deurzen, Edoardo Mirabella, Joscha Reichel, Thomas Reiter, Johann Felix von Soden-Fraunhofen

Downloads

We recommend the install script to install GoSam.

Here the files for manual installation (2.0-latest refers to the most up-to-date point release):

gosam-2.0-latest.tar.gz

Python package with GoSam

gosam-contrib-2.0-latest.tar.gz

convenience library containing most dependencies

gosam-2.0.pdf

GoSam reference manual

Examples of processes calculated with GoSam

Process MC Ref

$ pp \rightarrow bbbb$

MadGraph/MadDipole/MadEvent

arXiv:1105.3624

$pp \rightarrow W^+W^- + 2 \mbox{ jets (incl massive top loops) }$

MG/MD/ME

arXiv:1202.6004

SUSY QCD corrections to $pp \rightarrow \mbox{neutralino pair}+\mbox{jet} $

MG/MD/ME

arXiv:1212.5154

QCD corrections to $pp \rightarrow (\mbox{graviton} \rightarrow \gamma\gamma)+\mbox{jet} $

MG/MD/ME

arXiv:1308.2194

QCD corrections to $pp \rightarrow \gamma\gamma+\mbox{jet}$

MG/MD/ME

arXiv:1303.0824 package download

QCD corrections to $pp \rightarrow \gamma\gamma + 2 \mbox{ jets }$

MG/MD/ME

arXiv:1308.3660

$pp \rightarrow \mbox{Higgs} + 3 \mbox{ jets (gluon fusion) }$

MG/MD/ME/Sherpa

arXiv:1307.4737, arXiv:1506.01016

$pp \rightarrow \mbox{Higgs} + 2 \mbox{ jets (gluon fusion) }$

Sherpa

arXiv:1301.0493

$pp \rightarrow t \,\bar t + 0,1 \mbox{ jets }$

Sherpa

arXiv:1306.2703

$pp \rightarrow \mbox{Higgs} \, t \,\bar t + 1 \mbox{jet}$

Sherpa

arXiv:1307.8437

$pp \rightarrow W^+W^- b \bar b$

Sherpa

arXiv:1312.6659

$pp \rightarrow W + 0,1,2 \mbox{ jets }$

Sherpa

package download

$pp \rightarrow Z/\gamma^* + 0,1 \mbox{ jets }$

Sherpa

package download

$pp \rightarrow W b \,\bar b $

Sherpa

package download

$pp \rightarrow W^+W^- $

Sherpa

package download

$pp \rightarrow W^+W^+ + 2 \mbox{ jets }$

Sherpa

package download

$pp \rightarrow Z + 1,2,3 \mbox{jets (EW corrections)}$

arXiv:1305.6837

$pp \rightarrow H W/ H Z + 0,1 \mbox{jet} $

Powheg

arXiv:1306.2542

$pp \rightarrow $ top-philic resonance

MadGraph/MadDipole/MadEvent

arXiv:1410.6099

$pp \rightarrow Wb\,\bar b + 1\, \mbox{jet} $

Powheg

arXiv:1502.01213

$pp \rightarrow HH j j$

MadGraph/MadDipole/MadEvent

arXiv:1506.08008

$pp \rightarrow W + 2\, \mbox{jets}$ (EW corrections)

MadGraph/MadDipole/MadEvent

arXiv:1507.08579

$pp \rightarrow t\bar{t}\gamma\gamma

MadGraph5@NLO

arXiv:1509.02077

$gg \rightarrow VV$ in THDM (interference h - H)

MadGraph/MadDipole/MadEvent

arXiv:1512.07232

$pp \rightarrow W^+W^-$ + dim 8 operators

Herwig7

arXiv:1602.05141

Publications

  • Gavin Cullen, Hans van Deurzen, Nicolas Greiner, Gudrun Heinrich, Gionata Luisoni, Pierpaolo Mastrolia, Edoardo Mirabella, Giovanni Ossola, Tiziano Peraro, Johannes Schlenk, Johann Felix von Soden-Fraunhofen, Francesco Tramontano, "GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and Beyond", arXiv:1404.7096 [hep-ph].

  • Gavin Cullen, Nicolas Greiner, Gudrun Heinrich, Gionata Luisoni, Pierpaolo Mastrolia, Giovanni Ossola, Thomas Reiter, Francesco Tramontano, "Automated One-Loop Calculations with GoSam", arXiv:1111.2034 [hep-ph].