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28 March 2024
 
  » arxiv » physics/0401085

 Article overview


High Level Trigger Using ALICE ITS Detector
A. K. Mohanty ;
Date 19 Dec 2003
Subject Computational Physics | physics.comp-ph
AffiliationCERN
AbstractThe high $P_T$ trigger capabilities of the ALICE inner tracking system (ITS) as a standalone detector have been investigated. Since the high $P_T$ charged particles mostly lead to the linear trajectories within this ITS sector, it is possible to select tracks of $P_T$ of the order of 2 GeV and above by confining to a narrow search window in the ($ heta,phi$) space. Also shown that by performing a principal component transformation, it is possible to rotate from a 12 dimensional ($ heta$-$phi$) 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 $Delta heta = Delta phi sim 0.008$ radian and with PCA or ICA cut, the ITS can be used to trigger the jet particles with $P_T ge 2 $ GeV. Apart from triggering these high $P_T$ particles, this method can also be used to estimate the initial momentum of the high $P_T$ 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 $P_T$ tracks of rare events which might get lost in the TPC-TRD dead zone.
Source arXiv, physics/0401085
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