Zobrazeno 1 - 10
of 19
pro vyhledávání: '"O. Hanstein"'
Publikováno v:
Nuclear Physics A. 645:145-174
A new operator for pion photo- and electroproduction has been developed for nuclear applications at photon equivalent energies up to 1 GeV. The model contains Born terms, vector mesons and nucleon resonances ($P_{33}(1232)$, $P_{11}(1440)$, $D_{13}(1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9565aa41d4122cc53b617f03ccf4dfd
https://doi.org/10.1016/s0375-9474(98)00572-7
https://doi.org/10.1016/s0375-9474(98)00572-7
Publikováno v:
Scopus-Elsevier
A forward dispersion calculation is implemented for the spin polarizabilities $\gamma_1, ... ,\gamma_4$ of the proton and the neutron. These polarizabilities are related to the spin structure of the nucleon at low energies and are structure-constants
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77b682577f2453a810e7fb7b6db48909
https://doi.org/10.1016/s0370-2693(97)01536-0
https://doi.org/10.1016/s0370-2693(97)01536-0
Autor:
V. Kunde, R. Edelhoff, M. O. Distler, K. I. Blomqvist, M. Kahrau, W.U. Boeglin, G. Rosner, Simon Širca, B. Vodenik, Achim Richter, R. Geiges, K. W. Krygier, J.M. Friedrich, S. Schardt, K. Merle, M. Korn, L. Tiator, P. Sauer, E. A. J. M. Offermann, O. Hanstein, A. Liesenfeld, A. Wagner, Th. Pospischil, Dieter Drechsel, R. Neuhausen, S. Wolf, M. Potokar, A. Rokavec, R. Böhm, Th. Walcher, H. Schmieden, H. Kramer, M. Kuss
Publikováno v:
Zeitschrift f�r Physik A: Hadrons and Nuclei. 353:415-421
The reactione+p →> e+π ++n at c.m. energyW=1125MeV and momentum transfer Q2=0.117GeV2/c2 has been measured. The transverse and longitudinal structure functions have been separated by varying the polarization of the virtual photon (Rosenbluth plot)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e17ee991286c1b9afc87679652812c85
https://doi.org/10.1007/bf01285153
https://doi.org/10.1007/bf01285153
Publikováno v:
Nuclear Physics A. 684:321-323
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e9f322ad0d88c848048766cc4bc5053e
https://doi.org/10.1016/s0375-9474(01)00427-4
https://doi.org/10.1016/s0375-9474(01)00427-4
Autor:
R. M. Davidson, Lothar Tiator, Ron L. Workman, I. Aznauryan, O. Hanstein, Dieter Drechsel, S.S. Kamalov, Igor Strakovsky, A. S. Omelaenko, Richard A. Arndt, S.N. Yang
Publikováno v:
NSTAR 2001 ISBN: 9789812810878
We have fitted low- and medium-energy benchmark datasets employing methods used in the MAID/SAID and dynamical model analyses. Independent fits from the Mainz, RPI, Yerevan, and Kharkov groups have also been performed over the low-energy region. Resu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4a15a9386073d5d4893c8bf81675d0d
https://doi.org/10.1142/9789812810878_0072
https://doi.org/10.1142/9789812810878_0072
A partial wave analysis of pion photoproduction has been obtained in the framework of fixed-t dispersion relations valid from threshold up to 500 MeV. In the resonance region we have precisely determined the electromagnetic properties of the \Delta(1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd3b8018e59c15ce130dea465c4cecfe
http://arxiv.org/abs/nucl-th/0012046
http://arxiv.org/abs/nucl-th/0012046
Autor:
L. Tiator, N. d'Hose, G. Audit, T. Pinelli, J. C. McGeorge, R. Beck, Dieter Drechsel, P. Pedroni, J. R. M. Annand, O. Hanstein, J. Ahrens, A. Braghieri, R.O. Owens, H. J. Arends, Th. Walcher, H. P. Krahn, G. Tamas
Publikováno v:
Physical Review C. 61
Tagged linearly polarized photons have been used at the Mainz Microtron (MAMI) for simultaneous measurements of the $p(\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}},p){\ensuremath{\pi}}^{0}$ and $p(\stackrel{\ensuremath{\rightarrow}}{\ensu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23c923f82cd0aa3d1cc3fcfd5c66456f
https://doi.org/10.1103/physrevc.61.035204
https://doi.org/10.1103/physrevc.61.035204
Publikováno v:
N* Physics and Nonperturbative Quantum Chromodynamics ISBN: 9783709174104
Using a unitary isobar model a new operator for pion photo- and electroproduction has been developed for nuclear applications at photon equivalent energies up to 1 GeV. The model contains Born terms, vector mesons and nucleon resonances (P 33(1232),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6bedb9dc6593db18556d374ede9b851
https://doi.org/10.1007/978-3-7091-6800-4_28
https://doi.org/10.1007/978-3-7091-6800-4_28
We have analysed pion photoproduction imposing constraints from fixed t dispersion relations and unitarity. Coupled integral equations for the S and P wave multipoles were derived from the dispersion relations and solved by the method of Omnes and Mu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99b5c4c95c12ab06d4b55327c3855ca3
http://arxiv.org/abs/nucl-th/9709067
http://arxiv.org/abs/nucl-th/9709067
We give predictions for the partial wave amplitudes of pion photoproduction near threshold by means of dispersion relations at fixed t. The free parameters of this approach are determined by a fit to experimental data in the energy range 160 MeV $\le
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a4d1ae14cc7753057a391d0f0dbbb361