Athena Developer Guide
Athena Developer Guide
Athena Developer Guide
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<strong>Athena</strong><br />
Chapter 19 Analysis utilities Version/Issue: 2.0.0<br />
Chapter 19<br />
Analysis utilities<br />
19.1 Overview<br />
In this chapter we give pointers to some of the third party software libraries that we use within <strong>Athena</strong><br />
or recommend for use by algorithms implemented in <strong>Athena</strong>.<br />
19.2 CLHEP<br />
CLHEP (“Class Library for High Energy Physics”) is a set of HEP-specific foundation and utility<br />
classes such as random generators, physics vectors, geometry and linear algebra. It is structured in a set<br />
of packages independent of any external package. The documentation for CLHEP can be found on<br />
WWW at http://wwwinfo.cern.ch/asd/lhc++/clhep/index.html<br />
CLHEP is used extensively inside <strong>Athena</strong>, in the GaudiSvc and GaudiDbHCbEvent packages.<br />
19.3 HTL<br />
HTL ("Histogram Template Library") is used internally in <strong>Athena</strong> (GaudiSvc package) to provide<br />
histogramming functionality. It is accessed through its abstract AIDA compliant interfaces. <strong>Athena</strong> uses<br />
only the transient part of HTL. Histogram persistency is available with ROOT or HBOOK.<br />
The documentation on HTL is available at http://wwwinfo.cern.ch/asd/lhc++/HTL/index.html.<br />
Documentation on AIDA can be found at http://wwwinfo.cern.ch/asd/lhc++/AIDA/index.html.<br />
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