Top Quark Pair Production in Association with a Jet with Next-to-Leading-Order QCD Off-Shell Effects at the Large Hadron Collider.

We present a complete description of top quark pair production in association with a jet in the dilepton channel. Our calculation is accurate to next-to-leading order (NLO) in QCD and includes all nonresonant diagrams, interferences, and off-shell effects of the top quark. Moreover, nonresonant and off-shell effects due to the finite W gauge boson width are taken into account. This calculation constitutes the first fully realistic NLO computation for top quark pair production with a final state jet in hadronic collisions. Numerical results for differential distributions as well as total cross sections are presented for the Large Hadron Collider at 8 TeV. With our inclusive cuts, NLO predictions reduce the unphysical scale dependence by more than a factor of 3 and lower the total rate by about 13% compared to leading-order QCD predictions. In addition, the size of the top quark off-shell effects is estimated to be below 2%.

[Clinical study of electrical root canal length instruments]. / Klinische Untersuchungen zur elektrischen Wurzelkanallängenbestimmung.

In a clinical study on 100 root canals we measured the difference between the length, which can be received by a roentgenogramme, and the length, which can be received by an electrical device. In cases with vital exstirpation in 80% we got a good conincidence, but in cases of pulp gangraena there were great differences. Indication of electrical devices for measuring tooth length only can be seen together with an existing X-ray; it is very important, whether the canal is dry enough for exact measuring.

[Study of temperature of composite resins during polymerization]. / Untersuchungen über das Temperaturverhalten von Komposit-Kunststoffen bei der Polymerisation.

Temperature was measured during polymerization of 24 composite materials within 5 minutes (up to 10 minutes) after starting polymerization. A sudden rise (10 K-18 K) of temperature could be observed in most of the materials; soon afterwards the primary situation was reached again. The measured high temperatures should be considered to might be one of the factors, which lead to an affection of the pulp tissue.