Upgrading the ATLAS fast calorimeter simulation

[摘要] Many physics and performance studies with the ATLAS detector at the Large Hadron Collider require very large samples of simulated events, and producing these using the full Geant4 detector simulation is highly CPU intensive. Often, a very detailed detector simulation is not needed, and in these cases fast simulation tools can be used to reduce the calorimeter simulation time. In ATLAS, a fast simulation of the calorimeter systems was developed, called Fast Calorimeter Simulation (FastCaloSim). It provides a parametrized simulation of the particle energy response at the calorimeter read-out cell level. It is interfaced to the standard ATLAS digitization and reconstruction software and can be tuned to data more easily than Geant4. An improved parametrization is being developed, to eventually address shortcomings of the original version. It makes use of statistical techniques such as principal component analysis and a neural network parametrization to optimise the amount of information to store in the ATLAS simulation infrastructure.

[发布机构] Czech Technical University in Prague, FNSPE, Brehova 7, Praha 1; 115 19, Czech Republic^1

[效力级别] 计算机科学 [学科分类] 计算机科学（综合）

[关键词] Amount of information;ATLAS simulations;Detector simulations;Fast simulation tool;Large Hadron Collider;Performance study;Reconstruction software;Statistical techniques