Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-03-12
Comput.Phys.Commun. 153 (2003) 373-391
Physics
High Energy Physics
High Energy Physics - Experiment
24 pages, 15 figures, to be published in Computer Physics Communications
Scientific paper
10.1016/S0010-4655(03)00206-6
Stereo mini-jet cells will be indispensable components of a future $e^+e^-$ linear collider central tracker such as JLC-CDC. There is, however, no official Geant4 solid available at present to describe such geometrical objects, which had been a major obstacle for us to develop a full Geant4-based simulator with stereo cells built in. We have thus extended Geant4 to include a new solid ({\tt TwistedTubs}), which consists of three kinds of surfaces: two end planes, inner and outer hyperboloidal surfaces, and two so-called twisted surfaces that make slant and twisted $\phi$-boundaries. Design philosophy and its realization in the Geant4 framework are described together with algorithmic details. We have implemented stereo cells with the new solid, and tested them using geantinos and Pythia events ($e^{+}e^{-}\to ZH$ at $\sqrt{s} = 350 {\rm GeV}$). The performance was found reasonable: the stereo cells consumed only 25% more CPU time than ordinary axial cells.
Fujii Keisuke
Hoshina Kotoyo
Nitoh Osamu
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