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<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
<!--#include FILE="./header.inc"-->
<body>
<!--#include FILE="./navigation.inc"-->
<div id="MainIn2ColumnPage">
<IMG src="./images/logos/genie_logo_2_big_medium_resolution.png" width="330px" hspace="30px" vspace="20px" align="right">
<div id="FrontPageMainText">
<b>GENIE</b> is an <b>international collaboration</b> of scientists that
plays the leading role in
a) the development of a modern and universal event generator framework and tools in support of neutrino experiments,
b) the consistent, validated and efficient implementation of a constellation of alternative physics models within a common platform,
c) the development and characterisation of novel <b><u>comprehensive</u> physics models</b> for the <b>simulation
of neutrino interactions</b>, and
d) the development of an advanced <b>global analysis of neutrino scattering data</b>.
<br />
<br />
The GENIE collaboration
<b>maintains a popular suite of software products</b>
(including the
<A href="https://github.com/GENIE-MC/Generator" target="_top"><i><b>Generator</b></i></A>,
<A href="https://github.com/GENIE-MC/Comparisons" target="_top"><i><b>Comparisons</b></i></A>,
<A href="https://github.com/GENIE-MC/Tuning" target="_top"><i><b>Tuning</b></i></A>, and
<A href="https://github.com/GENIE-MC/Reweight" target="_top"><i><b>Reweight</b></i></A> products)
for the experimental neutrino community.
<br />
<br />
The well-known <i>Generator</i> implements a modern framework for Monte Carlo event generators and
includes state-of-the-art physics modules. The <b>GENIE physics model is universal and comprehensive</b>:
It handles all neutrinos and targets, and all processes relevant from MeV to PeV energy scales.
The <i>Generator</i> includes several tools (flux drivers, detector geometry navigation drivers,
and specialized event generation apps)
to <b>simulate complex experimental setups in full detail</b>.
The GENIE <i>Generator</i> is <b>used by nearly all modern neutrino experiments</b> and its
predictions serve as standard reference points for the neutrino community.
<br />
<br />
The <i>Comparisons</i> product includes very <b>extensive curated archives of neutrino, charged-lepton
and hadron scattering data</b>, as well as highly-developed software to produce a
<b>comprehensive set of data/MC comparisons</b>.
It includes embedded <b>interfaces to the <A href="https://professor.hepforge.org">Professor</A> tuning tool</b>
which "<i>reduces the exponentially expensive process of brute-force tuning to a scaling closer to a power
law in the number of parameters and allows for massive parallelisation</i>".
The <i>Comparisons</i> product plays a key role in comprehensive model characterization in GENIE,
it underpins the GENIE global analysis, and it enabled the production of several new tunes.
<br />
<br />
The <i>Tuning</i> product implements
the <b>powerfull new GENIE global analysis of neutrino scattering data</b>.
The GENIE global analysis produces <b>physics tunes which are fully integrated in the
<i>Generator</i> product</b>.
<br />
<br />
Finally, the <i>Reweight</i> product includes a selection of tools to <b>propagate model uncertainties
and to support generator-related analysis tasks</b>.
The reweighting procedure has inherent limitations. Important modelling systematics are not reweightable
in principle and they have no corresponding weight calculator in the <i>Reweight</i> product.
Indeed, the GENIE tuning procedure itself makes no use of the Reweight product but it relies on response
functions constructed from brute-force parameter scans made with the aid of the Professor tool.
Currently, the <i>Reweight</i> product it does not provide the full systematic error
for any GENIE tune. However, we have <b>medium-term plans to overhaul this product</b> and use it for
<b>public release of the detailed Professor/YODA response functions</b> constructed from our
brute-force systematic parameter scans, as well as to
release all covariance matrices from the GENIE global fits of neutrino scattering data.
The upgraded <i>Reweight</i> product will support all public GENIE physics tunes!
</div>
</div>
<!--#include FILE="./footer.inc"-->
</body>
</html>