dorsal/arxiv
View SchemaHigh Level Trigger Using ALICE ITS Detector
| Authors | A. K. Mohanty |
|---|---|
| Categories | |
| ArXiv ID | physics/0401085 |
| URL | https://arxiv.org/abs/physics/0401085 |
Abstract
The 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 ($\theta,\phi$) space. Also shown that by performing a principal component transformation, it is possible to rotate from a 12 dimensional ($\theta$-$\phi$) 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 $\Delta \theta = \Delta \phi \sim 0.008$ 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.
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"abstract": "The high $P_T$ trigger capabilities of the ALICE inner tracking system (ITS)\nas a standalone detector have been investigated. Since the high $P_T$ charged\nparticles mostly lead to the linear trajectories within this ITS sector, it is\npossible to select tracks of $P_T$ of the order of 2 GeV and above by confining\nto a narrow search window in the ($\\theta,\\phi$) space. Also shown that by\nperforming a principal component transformation, it is possible to rotate from\na 12 dimensional ($\\theta$-$\\phi$) space (in this space, a good ITS track has 6\npairs of hit co-ordinates) into a parametric space characterized by only two\nindependent components when the track momentum exceeds a particular limit. This\nindependent component analysis (ICA) has been uitilised further to reduce the\nfalse track contribution to an acceptable level particularly when the charged\nmultiplicity is large. Finally, it is shown that with a narrow bin width of\n$\\Delta \\theta = \\Delta \\phi \\sim 0.008$ radian and with PCA or ICA cut, the\nITS can be used to trigger the jet particles with $P_T \\ge 2 $ GeV. Apart from\ntriggering these high $P_T$ particles, this method can also be used to estimate\nthe initial momentum of the high $P_T$ tracks for seeding which can be further\nprolonged into the TPC detector both for offline and online Kalman tracking or\neven to detect those high $P_T$ tracks of rare events which might get lost in\nthe TPC-TRD dead zone.",
"arxiv_id": "physics/0401085",
"authors": [
"A. K. Mohanty"
],
"categories": [
"physics.comp-ph"
],
"title": "High Level Trigger Using ALICE ITS Detector",
"url": "https://arxiv.org/abs/physics/0401085"
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