Read e-book online b-Quark Physics with the LEP Collider: The Development of PDF

By Gary John Barker

ISBN-10: 3642052789

ISBN-13: 9783642052781

The ebook stories the unforeseen impression that the LEP experiments have had with regards 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, in particular the function performed by way of silicon strip detectors and particle identity equipment. the significance of fixing sensible concerns equivalent to detector alignment and tune reconstruction to totally notice the reconstruction strength of the detectors is tested besides quite a few examples of strength difficulties while those features should not good managed. Barker information new rules and research recommendations that developed in the course of the years of LEP working in order that the data comes in handy 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 around the globe and with appreciate to what we know about the traditional version of Particle Physics.

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Extra resources for b-Quark Physics with the LEP Collider: The Development of Experimental Techniques for b-Quark Studies from Z^0-Decay

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Open circles represent recorded hit positions and black dots represent hit positions predicted by a fit through the recorded hits (the small curvature of tracks is not shown) The DELPHI solenoidal magnetic field aligned with the z-axis caused holes and electrons to drift at a Lorentz angle to the electric field direction inside the strip devices. The result was a shift in the reconstructed R − φ coordinates away from the true crossing point of the charged particle (the R − z coordinates are unaffected) which would propagate through to an alignment uncertainty unless accounted for.

A 346, 476 (1994) 27 8. P. : Nucl. Instr. Meth. A 412, 304 (1998) 29 9. M. : Nucl. Instr. Meth. A 379, 436 (1996) 30, 31 10. M. : Nucl. Instr. Meth. A 314, 74 (1992) 30, 31 11. D. : Nucl. Instr. Meth. A 360, 481 (1995) 31 12. , P. : Nucl. Instr. Meth. A 378, 57 (1996) 31, 32, 33 References 13. 14. 15. 16. 17. , K. : Nucl. Instr. Meth. , D. : Nucl. Instr. Meth. , 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.

A illustration of the effect that these changes had on event reconstruction is shown in Fig. 3 where hits in the silicon detectors are depicted as squares, track fits are the solid lines and the extrapolation of the tracks towards the interaction point are dotted lines. The old (left plot) and new (right plots) algorithms have processed the same data event which is a rather typical hadronic Z0 decay producing two or more dense jets of particles. The result is that the new algorithm finds two extra tracks in the bottom hemisphere jet and three extra in the upper hemisphere.

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b-Quark Physics with the LEP Collider: The Development of Experimental Techniques for b-Quark Studies from Z^0-Decay by Gary John Barker


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