vol. 20, p. 755 (5 pages)
•abstract
Covariant, two-body, relativistic equations containing relevant potentials describing electromagnetic interactions between charged scalar–scalar and scalar–spinor particles, are derived using Barut’s method. Only terms proportional to products of the electric charges are considered. Obtained potential can be confining one.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/755/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/755
cite as
Acta Phys. Pol. B 20, 755 (1989)
vol. 20, p. 761 (5 pages)
•abstract
Two-body relativistic electrostatic potentials between charged, massive, spin-0 and massive, spin-\(\frac {1}{2}\) Dirac particles are derived using Barut’s method. Only terms proportional to products of the electric charges are considered.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/761/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/761
cite as
Acta Phys. Pol. B 20, 761 (1989)
vol. 20, p. 767 (9 pages)
•abstract
We have studied Cabibbo angle favored decays of D\(_{\rm s}\) (old F) into a vector and a pseudoscalar meson (VP modes) in factorization of the hadron currents approximation. The technique and the model were applied and tested, in the past, for the calculation of several two body decays of hadrons. The branching ratio for the decays D\(_{\rm s} \to \phi \pi \), D\(_{\rm s} \to {\rm K}^*\)K and D\(_{\rm s} \to \rho \eta \,(\eta ')\) are estimated. The results are found to be in general agreement with the experimental values and consistent with few other theoretical values. We also estimate the branching ratio for the decay D\(_{\rm s} \to \rho \pi \), which can occur only via quark flavor annihilation process and found it to be in agreement with the recent data by ARGUS at the DORIS II \(e^+e^-\) storage ring at DESY.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/767/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/767
cite as
Acta Phys. Pol. B 20, 767 (1989)
vol. 20, p. 777 (12 pages)
•abstract
We present a new approach to SU\(_{\rm 2L} \times {\rm U}_1\) radiative corrections at high energies. Our approach is based on the infrared summation methods of Yennie, Frautschi and Suura, taken together with the Weinberg–’t Hooft renormalization group equation. Specific processes which have been realized via explicit Monte Carlo algorithms are \(e^+e^- \to ff + n (\gamma )\), \(f = \mu ,\) \(\tau \), \(d\), \(s\), \(u\), \(c\), \(b\) or \(t\) and \(e^+e^- \to e^+e^- + n(\gamma )\), where \(n(\gamma )\) denotes multiple photon emission on an event-by-event basis. Exemplary Monte Carlo data are presented.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/777/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/777
cite as
Acta Phys. Pol. B 20, 777 (1989)
vol. 20, p. 789 (12 pages)
•abstract
The interaction between the “macrosystem” (corresponding to the so-called slow variables) and the “microsystem” (corresponding to the so-called fast variables) is considered. By using the Born–Oppenheimer adiabatic approximation it is shown that such interaction modifies dynamics of the “macrosystem”. We find the form of modified Poisson brackets for the “macrosystem”. We also show how symmetries and laws of conservation of the “macrosystem” are influenced by this interaction.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/789/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/789
cite as
Acta Phys. Pol. B 20, 789 (1989)
vol. 20, p. 801 (14 pages)
•abstract
The violation of chiral symmetry in massless QED is discussed within the framework of relativistic quantum mechanics.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/801/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/801
cite as
Acta Phys. Pol. B 20, 801 (1989)
See Erratum Acta Phys. Pol. B 21, 253 (1990)
vol. 20, p. 815 (8 pages)
•abstract
The effects induced by the interplay isovector and isoscalar components of the residual nuclear forces were studied in the model based on six bosons: \(s^+_{\mu }\) with \(J = 0\), \(T = 1\), \(\mu = 0\), \(\pm 1\) and \(p^+_{\mu }\) with \(J= 1\), \(\mu = 0\), \(\pm 1\), \(T = 0\). Low-lying energy levels, E2 transitions, \(p\)-boson structure of eigenstates, percentage of \(\alpha \)-clusters, \((p, t)\) reactions and \(\alpha \) elastic scattering were searched in even–even \(^{156-166}\)Dy and \(N = 92\), \(Z = 56\)–68 nuclei.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/20/9/815/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/20/9/815
cite as
Acta Phys. Pol. B 20, 815 (1989)
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