May 14 – 16, 2014
University of Pennsylvania
US/Eastern timezone

Three-Dimensional Triplet Tracking for LHC and Future High Rate Experiments

May 14, 2014, 5:00 PM
25' presentation + 5' for discussion

25' presentation + 5' for discussion

Oral presentation


Andre Schoening (Physikalisches Institut-Ruprecht-Karls-Universitaet Heidelberg-U)


The hit combinatorial problem is one of the main challenges for track reconstruction and track triggering at high rate experiments. At hadron colliders the dominant fraction (99%) of hits is due to low momentum tracks for which multiple scattering effects dominate hit resolution effects. Multiple scattering is also the dominating source for track uncertainties in low energy precision experiments. In such environments, track reconstruction and fitting can be largely simplified using three-dimensional (3D) hit-triplets, where the track uncertainties are solely determined by multiple scattering effects at the middle hit layer. Fitting of hit-triplets is particularly simple in experiments exploiting a solenoidal magnetic field. In contrast to track reconstruction methods based on the linking of single hits or hit pairs (vector tracking) a triplet method provides full track parameters and does not suffer from fake combinations as the 3D-triplet fit is over-constrained. Full tracks are step-wise reconstructed by connecting already fitted hit triplets, thus heavily reducing the combinatorial problem and enabling a fast track reconstruction. The triplet method is ideally suited for pixel detectors, which allow to treat hits as space-points. With the advent of relatively cheap and industrially available CMOS-sensors the construction higly granular full scale pixel tracking detectors is possible. Tracking performance studies for full-scale pixel detectors, including the optimisation for 3D-triplet tracking are presented and compared to standard tracker designs and reconstruction methods. The potential of reducing the number of tracking layers and - along with that- the material budget using this new tracking concept is discussed. The possibility of using 3D-triplet tracking for track triggering or fast online tracking is also mentioned.

Primary author

Andre Schoening (Physikalisches Institut-Ruprecht-Karls-Universitaet Heidelberg-U)

Presentation materials