1,720,991 research outputs found
VECTOR-BOSON SELF-COUPLINGS IN AN ELECTROWEAK THEORY WITH HEAVY GAUGE BOSON TRIPLETS
No full textCVETIC G, Kögerler R. VECTOR-BOSON SELF-COUPLINGS IN AN ELECTROWEAK THEORY WITH HEAVY GAUGE BOSON TRIPLETS. PHYSICS LETTERS B. 1990;237(3-4):463-468
QUANTUM-INDUCED FERMIONIC COUPLINGS OF NEW HEAVY GAUGE BOSONS
No full textCVETIC G, Kögerler R. QUANTUM-INDUCED FERMIONIC COUPLINGS OF NEW HEAVY GAUGE BOSONS. PHYSICS LETTERS B. 1989;217(4):496-504
INDUCED FERMIONIC INTERACTIONS IN THEORIES WITH GENERAL NONLINEARLY REALIZED SSB
No full textCVETIC G, Kögerler R. INDUCED FERMIONIC INTERACTIONS IN THEORIES WITH GENERAL NONLINEARLY REALIZED SSB. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. 1990;48(1):109-119
FERMIONIC COUPLINGS IN AN ELECTROWEAK THEORY WITH NONLINEAR SPONTANEOUS SYMMETRY-BREAKING
No full textCVETIC G, Kögerler R. FERMIONIC COUPLINGS IN AN ELECTROWEAK THEORY WITH NONLINEAR SPONTANEOUS SYMMETRY-BREAKING. NUCLEAR PHYSICS B. 1989;328(2):342-374
Vector boson selfinteractions and vector boson production within the BESS model
No full textCvetic G, Grosse-Knetter C, Kögerler R. Vector boson selfinteractions and vector boson production within the BESS model. 1991
PHENOMENOLOGICAL IMPLICATIONS OF AN ELECTROWEAK THEORY WITHOUT HIGGS
No full textCVETIC G, Kögerler R, TRAMPETIC J. PHENOMENOLOGICAL IMPLICATIONS OF AN ELECTROWEAK THEORY WITHOUT HIGGS. PHYSICS LETTERS B. 1990;248(1-2):128-138
STRONGLY INTERACTING GAUGE BOSON SECTOR IN AN ELECTROWEAK THEORY WITH HIDDEN GAUGE-SYMMETRY
No full textCVETIC G, Kögerler R. STRONGLY INTERACTING GAUGE BOSON SECTOR IN AN ELECTROWEAK THEORY WITH HIDDEN GAUGE-SYMMETRY. NUCLEAR PHYSICS B. 1991;353(2):462-492.We consider an SU(2) x U(1) gauge theory with nonlinearly realized spontaneous symmetry breaking as a model for electroweak interactions in which no physical Higgs particle occurs. It contains a further triplet of heavy vector fields (in addition to the ordinary gauge bosons W-mu and Y-mu). The theory is nonrenormalizable and therefore new interactions are generated at each loop level. We construct invariant new effective terms representing such interactions and calculate the 1-loop induced parameters corresponding to some of those terms. In particular, we determine the 1-loop induced cubic self-interactions of gauge bosons (light and heavy ones). We show that they are of Yang-Mills type and do not lead to anomalous magnetic or electric moments. They should show up as a considerable breaking of fermion-gauge boson coupling universality
COMPLETE DETERMINATION OF GAUGE BOSON SELF-INTERACTIONS IN THE BESS MODEL
No full textCVETIC G, Kögerler R. COMPLETE DETERMINATION OF GAUGE BOSON SELF-INTERACTIONS IN THE BESS MODEL. NUCLEAR PHYSICS B. 1991;363(2-3):401-424.The electroweak gauge theory with nonlinearly realized SSB (BESS model), which is the Higgs-less alternative to the SM, is defined by a nonrenormalizable lagrangian. Consequently, new interactions emerge at each loop order. We calculate these (quantum-induced) contributions to both cubic and quartic gauge boson self-interactions and observe a striking difference between the two cases: while the induced three-boson couplings remain of the pure Yang-Mills type, this is not the case with the quartic ones. Furthermore, it is shown that the resulting interaction strengths are sizably different from the SM ones, if the "hidden symmetry" parameter lambda-2 is not small. These deviations from the SM may lead to interesting phenomenological implications, e.g. in W+W- or WZ production
Method for comparing finite temperature field theory results with lattice data
No full textCvetic G, Kögerler R. Method for comparing finite temperature field theory results with lattice data. PHYSICAL REVIEW D. 2007;75(5): 054016.The values of the presently available truncated perturbative expressions for the pressure of the quark-gluon plasma at finite temperatures and finite chemical potential are trustworthy only at very large energies. When used down to temperatures close to the critical one (T-c), they suffer from large uncertainties due to the renormalization scale freedom. In order to reduce these uncertainties, we perform resummations of the pressure by applying two specific Pade-related approximants to the available perturbation series for the short-distance and for the long-distance contributions. In the two contributions, we use two different renormalization scales which reflect different energy regions contributing to the different parts. Application of the obtained expressions at low temperatures is made possible by replacing the usual four-loop (MS) over bar beta function for alpha(s) by its Borel-Pade resummation, thus eliminating the unphysical Landau singularities of alpha(s). The obtained results are remarkably insensitive to the chosen renormalization scale and can be compared with lattice results-for the pressure p, the chemical potential contribution Delta p to the pressure, and various susceptibilities. A good qualitative agreement with the lattice results is revealed down to temperatures close to T-c
Pade-related resummations of the pressure of quark-gluon plasma by approximate inclusion of g(s)(6) terms
No full textCvetic G, Kögerler R. Pade-related resummations of the pressure of quark-gluon plasma by approximate inclusion of g(s)(6) terms. PHYSICAL REVIEW D. 2004;70(11): 114016.We perform various resummations of the hot QCD pressure based on the actual knowledge of the perturbation series which includes the similar tog(s)(6)ln(1/g(s)) and part of the similar tog(s)(6) terms. Resummations are performed separately for the short- and long-distance parts. The similar tog(s)(6) term of the short-distance pressure is estimated on the basis of the known UV cutoff dependence of the long-distance part. The resummations are of the Pade and Borel-Pade type, using in addition the (Pade)resummed expression for the squared Debye screening mass m(E)(2) and, in some cases, even for the electrostatic QCD coupling parameter g(E)(2). The resummed results depend weakly on the yet unknown similar tog(s)(6) terms and on the short-range renormalization scale, at all temperatures. The dependence on the long-range renormalization scale is appreciable at low temperatures Tless than or similar to1 GeV. The resulting dependence of pressure on temperature T is compatible with the results of the lattice calculations at low T
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