b-Quark Physics with the LEP Collider: The Development of by Gary John Barker

By Gary John Barker

The ebook stories the unforeseen effect that the LEP experiments have had with reference to 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, specially the function performed via silicon strip detectors and particle id equipment. the significance of fixing useful matters akin to detector alignment and song reconstruction to totally notice the reconstruction strength of the detectors is confirmed besides a number of examples of strength difficulties whilst those points should not good managed. Barker info new rules and research concepts that advanced throughout the years of LEP working 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 worldwide and with admire to what we find out about the traditional version of Particle Physics.

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P. : Nucl. Instr. Meth. , B. : Nucl. Instr. Meth. A 289, 35 (1990) 34 K. Mönig: Rept. Prog. Phys. 61, 999 (1998) 34 35 Chapter 3 Experience in Reconstructing Z0 → bb¯ Events A tremendous amount of experience was gained as a result of extracting the most from the LEP data sets. In this chapter we review the developments that had the largest impact on b-physics analysis. 1 Impact Parameter and Decay Length Central to studies of b-physics at LEP were two reconstructed parameters that were sensitive to the relatively long lifetime of b-hadrons: impact parameter and decay length.

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. This introduces systematic uncertainties if the form of the L-distribution is not exactly known since the t-distribution of any background remaining in the sample after the cut must be accounted for in the final lifetime fit. In the DELPHI analysis of B+ and B0d lifetimes based on exclusively reconstructed semi-leptonic decays [2], most of the systematic error was due to uncertainties in the background estimate.

G. [8]). The second aspect of tracking which saw general development concerns pattern recognition. Tracking was dominated by conventional gaseous drift chambers in the early years of LEP. This was due to the fact that it took time for ALEPH and DELPHI to fully understand and integrate the data from their new silicon vertex detectors into physics analysis and L3 and OPAL began data taking without silicon devices. Once the silicon devices were properly integrated and, in particular, accurately aligned (see Sect.

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