Speaker
Dr
Yao Zhang
(Institute of High Energy Physics, Chinese Academy of Sciences)
Description
The BESIII detector will be commissioned at the upgraded Beijing Electron
Positron Collider (BEPCII) at the end of 2007. The drift chamber(MDC), which is
one of the most important sub-detectors of the BESIII detector, is expected to
provide good momentum resolution (0.5%@1GeV/c) and tracking efficiency in a
range of 0.1~2.0 GeV/c. This makes stringent demands on the performance of
the offline software. The event reconstruction and offline calibration algorithms
have been developed in BESIII Offline Software System (BOSS), using C++
language and object-oriented techniques.
The reconstruction consists of tracking and track fitting using Kalman filter
method. The tracking uses a pattern matching method to find track segments
and then combined into track candidates followed by a least square fit. The
track fitting based on Kalman filter is used to handle effects of material and
non-uniform magnetic field. The implementation of the tracking
and the fitting algorithms and the performance with the Monte Carlo data will be
presented.
The study of the offline calibration method using the cosmic ray data,
including the calibration of the X-T relation and the software alignment, will
be also presented.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | BESIII |
|---|
Author
Dr
Linghui Wu
(Institute of High Energy Physics, Chinese Academy of Sciences)
Co-author
Dr
Yao Zhang
(Institute of High Energy Physics, Chinese Academy of Sciences)
