Abstract
In the Large Electron and Positron (LEP) collider era, quark tagging and spectroscopy of short-lived particles demanded high-precision tracking with flavour tagging possibilities via the second vertex identification method. Taking the success of silicon sensors in NA11 (see Sect. 3.2) and MARKII [193] into account, silicon was the obvious candidate for the innermost tracking detector complemented by drift chambers and/or time projection chambers at larger radii.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Notes
- 1.
DELPHI followed the example of ALEPH, which started right away with double-sided silicon sensors.
- 2.
Heavy quarks from e.g. \(J/\varPsi \) containing a c quark or the \(\varUpsilon \) meson containing \({b\bar{b}}\).
- 3.
The track does not pass through the primary vertex.
- 4.
Rz IP resolution is given for perpendicular tracks, since the point resolution (inclined tracks) as well as the amount of material strongly depends on \(\varTheta \) for the z-coordinate
- 5.
The \(W^{+}W^-\) production cross-section close to threshold energies is a few picobarns only, thus the expected event rate is relatively small and a high detection efficiency is necessary.
- 6.
The “horizontal” planes face each other, therefore strips are oriented \(\pm 2^\circ \).
- 7.
Noise distributions around pinholes looked like a high mountain range and the occurrence was called “Mt. Fuji”.
- 8.
Fortunately, there were not too many such cases.
- 9.
Thermal noise from parallel resistances is proportional to the shaping time, thus crucial for LEP operations. In addition the modules daisy-chain up to four sensors. The parallel arrangement of \(R_{poly}\) decreases effective resistance (see Sect. 1.5).
- 10.
\(p^+\)-stops was the common configuration; the \(p^+\)-spray technique was developed later.
- 11.
n-side is more noisy, e.g. due to the higher load capacitance.
- 12.
Triggering on \(\gamma s\) is not possible, but with a strong source and an integration time of \(2\,\upmu \mathrm{s}\) a readout frequency of about 3 Hz without trigger was achieved – enough for calibration.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2017 Springer International Publishing AG
About this chapter
Cite this chapter
Hartmann, F. (2017). The DELPHI Microvertex Detector at LEP. In: Evolution of Silicon Sensor Technology in Particle Physics. Springer Tracts in Modern Physics, vol 275. Springer, Cham. https://doi.org/10.1007/978-3-319-64436-3_4
Download citation
DOI: https://doi.org/10.1007/978-3-319-64436-3_4
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-64434-9
Online ISBN: 978-3-319-64436-3
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)