Dissertori, G; Gehrmann-DeRidder, A; Gehrmann, T; Glover , E W N; Heinrich, G; Stenzel, H Dissertori, G; Gehrmann-DeRidder, A; Gehrmann, T; Glover , E W N; Heinrich, G; Stenzel, H (2008). First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e+e− annihilations. Journal of High Energy Physics, 2008(2):040. Postprint available at: http://www.zora....

From the field strengths defined in noncommutative geometry, we construct a bosonic lagrangian of the standard model by using a natural way. It is shown that constraints among coupling constants of our model can be renormalization group invariant (RGI). We also consider the relation between the condition that a constraint among coupling constants of a model becomes RGI and a condition that the ...

It is postulated that the action of the FRW-universe is the cos-mological term of Einstein's theory (no curvature term-" R 0 Cos-mology "). The expansion equation emerging from the embedding of this most simple brane world with variable speed of light is deduced. The universal dimensionless coupling constant of gravity is addressed. Some implications on the deep problems of cosmology are discus...

This paper is devoted to the evaluation of the energy-momentum density components for the Friedmann models. For this purpose, we have used Møller’s pseudotensor prescription in General Relativity and a certain energy-momentum density developed from his teleparallel formulation. It is shown that the energy density of the closed Friedmann universe vanishes on the spherical shell at the radius ρ =...

The hygrophorones, a class of cyclopentenones isolated from fruiting bodies of the genus Hygrophorus (basidiomycetes), show promising antifungal activity. While the constitution of 4,6diacetylhygrophorone A (3) and the relative configuration of the stereogenic centers in the cyclopentenone ring were elucidated using standard NMR and MS techniques, the relative configuration of the exocyclic ste...

We present results on an analysis of the decay constants f Bd and f Bs with two flavours of sea quark. The calculation has been carried out on 3 different bare gauge couplings and 4 sea quark masses at each gauge coupling, with m π /m ρ ranging from 0.8 to 0.6. We employ the Fermilab formalism to perform calculations with heavy quarks whose mass is in the range of the b-quark. A comparison with...

We present an elegant exact formula for the gaugino β-function in a softly-broken supersymmetric gauge theory, of the form β M = O(β g /g), where β g is the gauge β function and O is a simple differential operator acting on the gauge coupling g and the Yukawa

We consider general supersymmetric models with (a) arbitrary matter content and (b) gauge coupling unification near the string scale ,1017 GeV, and derive the absolute upper limit on the mass of the lightest Higgs boson. For models without Higgs couplings to extra SU(2) triplets the bound is about 155 GeV. The bound is maximized for models with such triplets and can be as high as 205 GeV, signi...

We study two and three jet events with a large rapidity gap at HERA. Unlike in the IngelmanSchlein approach we do not adscribe a structure to the Pomeron. Instead, the coupling of the Pomeron to quarks or gluons is taken pointlike, which makes the model easy to test: the only degrees of freedom are the coupling constants of the Pomeron to the quarks or the gluons and a cutoff procedure to keep ...