2004/01/19 by A. K. Mohanty, Mohanty, A. K.
Physics and Astronomy · #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Radiation Detection and Scintillator Technologies #physics.comp-ph
paper · pdf · doi:10.48550/arxiv.physics/0401085
20 pages, 10 figures
arxiv created 2004/01/19 · openalex publication_date 2004/01/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The high PT trigger capabilities of the ALICE inner tracking system (ITS) as a standalone detector have been investigated. Since the high PT charged particles mostly lead to the linear trajectories within this ITS sector, it is possible to select tracks of PT of the order of 2 GeV and above by confining to a narrow search window in the (θ,ϕ) space. Also shown that by performing a principal component transformation, it is possible to rotate from a 12 dimensional (θ-ϕ) space (in this space, a good ITS track has 6 pairs of hit co-ordinates) into a parametric space characterized by only two independent components when the track momentum exceeds a particular limit. This independent component analysis (ICA) has been uitilised further to reduce the false track contribution to an acceptable level particularly when the charged multiplicity is large. Finally, it is shown that with a narrow bin width of Δθ= Δϕ∼ 0.008 radian and with PCA or ICA cut, the ITS can be used to trigger the jet particles with PT ≥ 2 GeV. Apart from triggering these high PT particles, this method can also be used to estimate the initial momentum of the high PT tracks for seeding which can be further prolonged into the TPC detector both for offline and online Kalman tracking or even to detect those high PT tracks of rare events which might get lost in the TPC-TRD dead zone.