By Gary John Barker
The publication stories the unforeseen impression that the LEP experiments have had just about b-quark physics. The emphasis is firmly on telling the tale from an experimental perspective. elements of the detectors that have been crucial for the reconstruction of b-hadrons are highlighted, particularly the position performed by way of silicon strip detectors and particle id tools. the significance of fixing functional matters equivalent to detector alignment and tune reconstruction to totally observe the reconstruction strength of the detectors is validated besides quite a few examples of power difficulties whilst those elements usually are not good managed. Barker information new principles and research innovations that advanced in the course of the years of LEP operating in order that the data turns out to be useful to new researchers or these placing jointly plans for destiny b-physics experiments. Highlights of the ultimate b-physics effects from the LEP collaborations are reviewed within the context of effects from different experiments world wide and with appreciate to what we know about the normal version of Particle Physics.
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Additional info for b-Quark Physics with the LEP Collider: The Development of Experimental Techniques for b-Quark Studies from Z^0-Decay
The result is that the new algorithm finds two extra tracks in the bottom hemisphere jet and three extra in the upper hemisphere. In addition, what appear to be false tracks of high curvature not pointing back to the interaction point that appear in the first picture are absent in the new results. g. (see Fig. 4). The result Fig. 1 Impact Parameter and Decay Length K 43 K 30% more Λ Λ 15% φ 20% more φ Fig. 4 Comparing the effect of the old (right column) and new (left column) DELPHI tracking on some reconstructed mass peaks.
A characteristic momentum uncertainty from inclusive reconstruction of b-hadrons was 15–20%. This improves for semi-leptonic decays (where scaling the measured momentum of the decay products can partially compensate for the loss of the neutrino) and in techniques using more sophisticated inclusive methods (discussed further in Sect. 4). The decay length uncertainty also contributes indirectly to the overall uncertainty. Lifetime analyses usually cut on the decay length to reduce backgrounds mainly from light-quark events.
Using such techniques, DELPHI were eventually able to measure barycentric shifts of holes and electrons ranging between 10 and 20 μm, all toward the p-side of devices. The physical origin of the barycentric shift is thought likely to be due to variations in dopant concentration through the bulk silicon but this remains to be confirmed. e. before the positions of modules in the DELPHI vertex detector database were altered to reflect the shifts with respect to the initial survey results. The alignment results contained some surprises - one of which was the degree of global misalignment of half shells already mentioned.
b-Quark Physics with the LEP Collider: The Development of Experimental Techniques for b-Quark Studies from Z^0-Decay by Gary John Barker