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1.
T. Van Cauteren J. Ryckebusch B. Metsch H. -R. Petry 《The European Physical Journal A - Hadrons and Nuclei》2007,31(4):613-615
We present some of our results for the electromagnetic properties of excited Σ hyperons, computed within the framework of the Bonn constituent-quark model, which is based on the Bethe-Salpeter approach.
The seven parameters entering the model are fitted against the best-known baryon masses. Accordingly, the results for the
form factors and helicity amplitudes are genuine predictions. We compare with the scarce experimental data available and discuss
the processes in which Σ
*'s may play an important role. 相似文献
2.
3.
4.
V. V. Anisovich B. Ch. Metsch H. R. Petry A. V. Sarantsev 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(4):417-433
We investigate a special concept of quarkhadron duality in meson physics at low and intermediate energies. With a relativistic propagator for confined quarks, we calculated masses and widths of the mesons which areS- andP-wave states ofq¯q (J P=0?, 1?, 0+, 1+c, 2+) as well as meson-meson scattering amplitudes at energies up totrs ≤ 1.3 GeV by including light pseudoscalar and vector mesons into the interaction dynamics. Our investigation shows that the influence of the light meson dynamics resutls in:
- a contribution to the constituent quark mass of approximately 200 MeV.
- the appearance of a new soft confinement force barrier responsible for the formation of the highly excited meson states.
5.
We show that a maximal partial spread inPG(3,q) is either a spread or has at most
lines. This implies that it is not possible to cover all points but the points of a Baer-subspace by lines. 相似文献
6.
7.
D. Bender G. Eulenberg A. Richter E. Spamer B.C. Metsch W. Knüpfer 《Nuclear Physics A》1983,398(3):408-414
Following the studies of the distribution of M1 strength in the even-even N = 28 isotones 48Ca, 50Ti, 52Cr and 54Fe by inelastic electron scattering, the result of a search for M1 transitions in the odd-even N = 28 nucleus 51V is reported. No strong M1 excitation has been detected, in contrast to a recent (p, p') experiment. There is no immediate explanation for this discrepancy. Shell-model calculations indicate that a part of it might be accounted for by an interference between the spin and orbital term of the electromagnetic transition operator in the (e, e') experiment. 相似文献
8.
Klaus Metsch 《组合设计杂志》1995,3(4):293-297
Suppose that q ? 2 is a prime power. We show that a linear space with a(q + 1)2 + (q + 1) points, where a ? 0.763, can be embedded in at most one way in a desarguesian projective plane of order q. © 1995 John Wiley & Sons, Inc. 相似文献
9.
C. Haupt B. Metsch H. -R. Petry 《The European Physical Journal A - Hadrons and Nuclei》2006,28(2):213-225
We show that static properties like the charge radius and the magnetic moment of relativistic three-fermion bound states with
instantaneous interactions can be formulated as expectation values with respect to intrinsically defined wave functions. The
resulting operators can be given a natural physical interpretation in accordance with relativistic covariance. We also indicate
how the formalism may be generalized to arbitrary moments. The method is applied to the computation of static baryon properties
with numerical results for the nucleon charge radii and the baryon octet magnetic moments. In addition, we make predictions
for the magnetic moments of some selected nucleon resonances and discuss the decomposition of the nucleon magnetic moments
in contributions of spin and angular momentum, as well as the evolution of these contributions with decreasing quark mass. 相似文献
10.
Klaus Metsch 《Journal of Geometry》2003,76(1-2):216-232