Professor Tony Weidberg

Abstract:

We report measurements of the behaviour of silicon diodes when exposed to integrated neutron doses of up to 5 × 1013 neutron/cm2. The measurements have been made at diode temperatures between room temperature and -20°C. From measurements of the diode leakage current and depletion voltage, and consequent evaluations of the effective impurity concentration, the temperature dependence of these quantities is discussed in terms of the annealing behaviour of the diodes. Comments are made on the suitability of silicon as a detector medium for particle physics experiments at future accelerators. © 1993.

Abstract:

The process t→H+b, H+→τ+v, τ+→hadrons+v and its charge conjugate are investigated by seeking an excess in number of observed τ's beyond that expected from the standard model under the assumption of e-τ universality. No such excess is found and new regions of the mH-mt plane are excluded for B(H+→τv) = 0.5 and 1.0. In addition, the ratio of couplings of the τ and e to the W is precisely measured as gwτ/gwe = 1.02 ± 0.04(stat.)±0.04(syst.). © 1992.

Abstract:

The process pp→evγ+X is studied as √s=630 GeV. The observed signal is used to extract a direct measurement of the parameters κ and λ which define the magnetic dipole and electric quadrupole moments of the W boson and therefore the WWγ coupling. We find κ=1+2.6-2.2 and λ=0+1.7-1.8 and their 95% confidence limits -3.5<κ<5.9 and -3.6<λ<3.5. The results are model indepedent and in good agreement with the standard model values, κ=1 and λ=0. © 1992.