SN0187 : REALISTIC ANALYTICAL MODEL OF XTPC PERFORMANCE; RECONSTRUCTION; SECONDARY REJECTION
Updated on Sat, 2007-07-14 01:38. Originally created by chajecki on 2007-06-18 19:57.
| Author(s) | : | J. Draper, L. Wood, J. Romero, D. Cebra, P. Brady |
| Date | : | Feb. 1, 1995 |
| File(s) | : | sn0187.ps.gz |
| Abstract | : | Analytical geometric solutions to the properties of the tracks in the STAR External TPC are derived and analyzed. A thin disk of radially increasing radial magnetic field following a cylinder of uniform axial magnetic field represents the field of the STAR solenoid. When the nonlinearity of the radial magnetic field is included, this model gives twist, radius and tracklength that match quite well, qualitatively and quantitatively, those we obtained using STAR GEANT. The model provides a quantitative understanding of the reason why the XTPC must be located as close as possible to the central TPC's magnet pole piece. The model is used to produce and analyze a quick, highly accurate method to reconstruct the pseudorapidity and momentum of each primary track over a wide range of momenta, >~0.2 to <~ 10 GeV/c. The model is also used to obtain a quick, highly selective method to eliminate the tracks of almost all secondary particles from the analysis. The analysis is made without multiple scattering. Tests with GEANT, including multiple scattering, are in progress. |
| Keywords | : | |
| Category | : | Technical |
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