Vertex tracking at a future linear collider

Abstract

The anticipated physics program at an high energy e + e − linear collider places special emphasis on the accuracy in extrapolating charged particle tracks to their production vertex to tag heavy quarks and leptons. This paper reviews physics motivations and performance requirements, sensor R&D directions and current results of the studies for a vertex tracker at a future linear collider.

Characterisation of a thin fully depleted SOI pixel sensor with high momentum charged particles

“…With the mitigation of the back-gating effect by implanting a buried p-well (BPW) beneath the buried oxide (BOX) [1], SOI pixel sensor prototypes have demonstrated high detection efficiency and micron-size single point resolution [2]. Because of the need to minimise multiple scattering in precision vertex tracking at future colliders, the total thickness of sensor ladders should be ≤ 100 µm of Si-equivalent while retaining high S/N and detection efficiency [3]. In this paper, we present the first characterisation of a thin, fully depleted SOI pixel sensor, with a nominal thickness of 70 µm, using high momentum charged hadrons.…”

Studies of vertex tracking with SOI pixel sensors for future lepton colliders

“…Vertex tracking is one of the capabilities most crucial to a detector at future lepton colliders and flavour factories. Much of the anticipated physics program at a high energy lepton collider, such as the ILC, CLIC or a muon collider relies on the ability of efficiently discriminating heavy (t, b, c and τ ) from light fermions [1,2]. If the Higgs boson exists at a mass of ≃ 125 GeV, as possibly indicated by the recent preliminary LHC [3,4] and Tevatron [5] results, the precise determination of its couplings to fermions will be essential to test whether the Brout-Englert-Higgs mechanism of electro-weak symmetry breaking is also responsible for fermion mass generation.…”