Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Theussl, L."'
Autor:
Di Domenico, A., Gabriel, A., Hiesmayr, B. C., Hipp, F., Huber, M., Krizek, G., Mühlbacher, K., Radic, S., Spengler, Ch., Theussl, L.
Publikováno v:
Foundations of Physics 42 (6), 778 (2012)
An effective formalism is developed to handle decaying two-state systems. Herewith, observables of such systems can be described by a single operator in the Heisenberg picture. This allows for using the usual framework in quantum information theory a
Externí odkaz:
http://arxiv.org/abs/1101.4517
A new version of the Feynman graph plotting tool JaxoDraw is presented. Version 2.0 is a fundamental re-write of most of the JaxoDraw core and some functionalities, in particular importing graphs, are not backward-compatible with the 1.x branch. The
Externí odkaz:
http://arxiv.org/abs/0811.4113
Autor:
Binosi, D., Theussl, L.
Publikováno v:
Comput.Phys.Commun.161:76-86,2004
JaxoDraw is a Feynman graph plotting tool written in Java. It has a complete graphical user interface that allows all actions to be carried out via mouse click-and-drag operations in a WYSIWYG fashion. Graphs may be exported to postscript/EPS format
Externí odkaz:
http://arxiv.org/abs/hep-ph/0309015
The pion form factor calculation in the ``point-form'' of relativistic quantum mechanics is re-considered. Particular attention is given to the relation between the momentum of the system and the momentum transfer as well as to the quark current.
Externí odkaz:
http://arxiv.org/abs/hep-ph/0308219
Form factors in the 'point form' of relativistic quantum mechanics: single and two-particle currents
Autor:
Desplanques, B., Theussl, L.
Publikováno v:
Eur.Phys.J. A21 (2004) 93
Electromagnetic and Lorentz-scalar form factors are calculated for a bound system of two spin-less particles exchanging a zero-mass scalar particle. Different approaches are considered including solutions of a Bethe-Salpeter equation, a ``point form'
Externí odkaz:
http://arxiv.org/abs/hep-ph/0307028
Publikováno v:
Phys.Lett. B574 (2003) 201-209
The electromagnetic form factor of the pion is calculated in the "point-form" of relativistic quantum mechanics using simple, phenomenological wave functions. It is found that the squared charge radius of the pion is predicted one order of magnitude
Externí odkaz:
http://arxiv.org/abs/hep-ph/0301235
Publikováno v:
Few Body Syst.Suppl. 14 (2003) 393
The effect of different boost expressions, pertinent to the instant, front and point forms of relativistic quantum mechanics, is considered for the calculation of the ground-state form factor of a two-body system in simple scalar models. Results with
Externí odkaz:
http://arxiv.org/abs/hep-ph/0301137
Publikováno v:
Eur.Phys.J.A20:483-498,2004
We calculate generalized parton distribution functions in a field theoretic formalism using a covariant Bethe-Salpeter approach for the determination of the bound-state wave function. We describe the procedure in an exact calculation in scalar Electr
Externí odkaz:
http://arxiv.org/abs/nucl-th/0211036
The 3P0 decay model is briefly reviewed. Possible improvements, partly motivated by the examination of a microscopic description of a quark - anti-quark pair creation, are considered. They can provide support for the one-body character of the model w
Externí odkaz:
http://arxiv.org/abs/nucl-th/0204026
Publikováno v:
Nucl.Phys. A714 (2003) 213-249
The effect of different boost expressions is considered for the calculation of the ground-state form factor of a two-body system made of scalar particles interacting via the exchange of a scalar boson. The aim is to provide an uncertainty range on me
Externí odkaz:
http://arxiv.org/abs/nucl-th/0202046