Wilson coefficients for Higgs boson production and decoupling relations to O(αs4)\mathcal{O}\left(\alpha_s^4\right)

An important ingredient for the calculation of Higgs boson properties in the infinite top quark mass limit is the knowledge of the effective coupling between the Higgs bosons and gluons, i.e. the Wilson coefficients $C_H$ and $C_{HH}$ for one and two Higgs bosons, respectively. In this work we calculate for the first time $C_{HH}$ to four loops in a direct, diagrammatic way, discussing in detail all issues arising due to the renormalization of operator products. Furthermore, we also calculate the Wilson coefficient $C_H$ for the coupling of a single Higgs boson to gluons as well as all four loop decoupling relations in QCD with general SU$(N_c)$ colour factors. The latter are related to $C_H$ and $C_{HH}$ via low-energy theorems.Comment: 23 page

Spatial localization of knowledge-transfer channels and face-to-face contacts: A survey of the Jena university-industry linkages

In this paper we examine the knowledge-Transfer Channels of the universities and public research institutes in Jena. The empirical study is based on a survey of 297 personal interviews with researchers of both types of organisations. Our study focuses on three questions: (a) The importance and multitude of existing transfer channels, (b) their geographic distribution and (c) the importance of face-to-face contacts. With regard to the first question the analysis reveals some shortcomings of the usual channels considered in many empirical studies. Above all, informal transfer channels play an important role and in addition the multitude of transfer channels at hand turns out to be large. These outcomes suggest a very cautious interpretation of the claimed influences of transfer mechanisms like patents, joint publications and so on. As to the regional distribution of the linkages our results confirm the relevance of geographical proximity. A substantial part of the relevant transfer co-operations concentrate on the city and region. Finally, we examine the idea that 'distance matters' is due to the necessity of face-to-face contacts. By means of asking the researchers directly we found the puzzling result, that knowledge-transfer rests significantly upon personal contacts, but that this does not imply a bias towards geographical proximity. --

Forms and regional distribution of knowledge transfer by German universities

For the first time the transfer activities of two different German university types - the Friedrich Schiller University (FSU) and the University of Applied Sciences Jena (FH Jena) - were documented in parallel over all departments and channels of technology transfers with regard to their regional significance. Five groups of transfer activities are distinguished in the study: (1) those oriented on human capital, (2) those oriented on classic research and development, (3) those oriented on enterprises, (4) those oriented on direct transfers and (5) informal knowledge transfer channels. The results show that the traditional R&D-activities of the universities for the region are embedded into important supplemental transfer channels. In addition the radii of the external relations of the two universities are complementary: FH Jena has a stronger regional bearing, while FSU is more strongly active supra-regionally and internationally. It is possible that stronger support of the university faculty's activities establishing knowledge transfer could increase the regional economic impact of such activity. --innovation systems,technology transfer,regional development,Universities,know-how-transfer

Wilson coefficients for Higgs boson production and decoupling relations to O(α4^{4}S_{S})

An important ingredient for the calculation of Higgs boson properties in the infinite top quark mass limit is the knowledge of the effective coupling between the Higgs bosons and gluons, i.e. the Wilson coefficients CH and CHH for one and two Higgs bosons, respectively. In this work we calculate for the first time CHH to four loops in a direct, diagrammatic way, discussing in detail all issues arising due to the renormalization of operator products. Furthermore, we also calculate the Wilson coefficient CH for the coupling of a single Higgs boson to gluons as well as all four loop decoupling relations in QCD with general SU(Nc) colour factors. The latter are related to CH and CHH via low-energy theorems, which are used to obtain five-loop results for the Wilson coefficients

Electrochemiluminescence (ECL) sensing properties of water soluble core-shell CdSe/ZnS quantum dots/Nafion composite films

Water soluble positively charged 2-(dimethylamino) ethanethiol (DAET)-protected core-shell CdSe/ZnS quantum dots (QDs) were synthesized and incorporated within negatively charged Nafion polymer films. The water soluble QDs were characterized using UV-visible and fluorescence spectroscopies. Nafion/QDs composite films were deposited on glassy carbon electrodes and characterized using cyclic voltammetry. The electrochemiluminescence (ECL) using hydrogen peroxide as co-reactant was enhanced for Nafion/QDs composite films compared to films of the bare QDs. Significantly, no ECL was observed for Nafion/QDs composite films when peroxydisulfate was used as the co-reactant, suggesting that the permselective properties of the Nafion effectively exclude the co-reactant. The ECL quenching by glutathione depends linearly on its concentration when hydrogen peroxide is used as the co-reactant, opening up the possibility to use Nafion/QDs composite films for various electroanalytical applications

Formen und regionale Verteilung des Wissenstransfers von Hochschulen: Eine repräsentative Fallstudie für Jena

Neu an dieser Studie ist, dass zum ersten Mal umfassend die Transferaktivitäten von zwei unterschiedlichen Hochschultypen - in diesem Fall der Friedrich Schiller Universität (FSU) und der Fachhochschule Jena (FH Jena) - parallel und über alle Fächer hinweg hinsichtlich ihrer regionalen Bedeutung erfasst wurden. Unterschieden werden fünf Gruppen von Transferaktivitäten: (1) humankapitalorientierte, (2) auf die klassische Forschung und Entwicklung orientierte, (3) unternehmensorientierte, (4) direkt transferorientierte und (5) informelle Kanäle des Wissenstransfers. Es ergibt sich das Bild, dass die traditionellen FuE - Aktivitäten der Hochschulen für die Region eingebettet sind in wichtige ergänzende Transferkanäle. Komplementär sind außerdem die Radien in den Außenbeziehungen der beiden Hochschulen: die FH Jena hat den einen stärkeren regionalen Bezug, während die FSU stärker überregional und international aktiv ist. Möglicherweise könnte eine stärkere Unterstützung von Gründungsaktivitäten der Hochschullehrer die regionale wirtschaftliche Bedeutung ihres Wissenstransfers weiter erhöhen. --Innovationssysteme,Technologietransfer,Regionale Entwicklung,Hochschulen,Know - How - Transfer

Two-loop QCD penguin contribution to the width difference in Bs−BˉsB_s-\bar{B}_s mixing

We consider two-loop QCD corrections to the element $\Gamma_{12}^q$ of the decay matrix in $B_q-\bar{B}_q$ mixing, $q=d,s$, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator and constitute the next step towards a theory prediction for the width difference $\Delta\Gamma_s$ matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in $m_c/m_b$ up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase $\Delta\Gamma_s$.Comment: 22 pages, 2 figure

Two-loop QCD penguin contribution to the width difference in Bs_{s} − B‾\overline{B}s_{s} mixing

We consider two-loop QCD corrections to the element ${\Gamma}_{12}^q$ of the decay matrix in B$_{q}$ − ${\overline{B}}_q$ mixing, q = d, s, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator and constitute the next step towards a theory prediction for the width difference ∆Γs matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in m$_{c}$/m$_{b}$ up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase ∆Γs