LEP measurements on production, mass, lifetime of beauty particles

Mass and Lifetime of Unstable Particles

The relationship between the properties of the propagator of an unstable particle and the observation of mass and lifetime is considered. For illustrative purposes a model of a scalar (or pseudoscalar) particle (8) weakly coupled to two pions is treated. The propagator is shown to have a simple pole on the second (unphysical) Riernann sheet and it is assumed, as suggested by Peierls, that this ...

Performance Related Measurements on LEP

Measurements of the LEP beam parameters have been fundamental to performance improvements and this report describes the principles and techniques involved in the beam instrumentation systems of LEP. Geneva, Switzerland January 13, 1999

Latest measurements of beauty quark production at HERA

Production of heavy quarks is a fascinating tool to understand the nucleon structure as well as the underlying QCD parton dynamics. In addition production of b quarks is a source of background for many searches for new physics at existing and future colliders. The high b mass (Mb ≫ ΛQCD) should provide a solid basis for a perturbative calculation. Nevertheless, so far discrepancies between the ...

Precision Measurements at Lep and Lep-2

The status of the LEP precision measurements is reviewed, covering the electroweak measurements at the Z0, the studies of fermion pair production, and the totally new subject of W physics at LEP-2. The results presented here include both published and preliminary ones. These precision results are used to check the overall consistency of the Standard Model, and in its framework, constraints on i...

BEAUTY PRODUCTION CROSS SECTION MEASUREMENTS AT E cm = 1.96 TeV