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This title appears in the Scientific Report : 2007 

Eta and eta-prime mesons production at COSY-11

Eta and eta-prime mesons production at COSY-11

The low emittance and small momentum spread of the proton and deuteron beams of the Cooler Synchrotron COSY combined with the high mass resolution of the COSY-11 detection system permit to study the creation of mesons in the nucleon-nucleon interaction down to the fraction of MeV with respect to the...

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Personal Name(s): Moskal, P.
Adam, H.-H. / Budzanowski, A. / Czerwinski, E. / Czyzykiewicz, R. / Gil, D. / Grzonka, D. / Janusz, M. / Jarczyk, L. / Kamys, B. / Khoukaz, A. / Klaja, P. / Majewski, J. / Oelert, W. / Piskor-Ignatowicz, C. / Przerwa, J. / Ritman, J. / Rejdych, B. / Rozek, T. / Sefzick, T. / Siemasko, M. / Smyrski, J. / Täschner, A. / Winter, P. / Wolke, M. / Wüstner, P. / Zipper, W.
Contributing Institute: Experimentelle Hadronstruktur; IKP-1
Published in: International journal of modern physics / A, 22 (2007) S. 305 - 316
Imprint: Singapur World Scientific Publ. 2007
Physical Description: 305 - 316
DOI: 10.1142/S0217751X07035471
Document Type: Journal Article
Research Program: Physik der Hadronen und Kerne
Series Title: International Journal of Modern Physics A 22
Subject (ZB):
J
meson-nucleon interaction
near threshold meson production
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OpenAccess
OpenAccess
Publikationsportal JuSER
Please use the identifier: http://dx.doi.org/10.1142/S0217751X07035471 in citations.
Please use the identifier: http://hdl.handle.net/2128/10554 in citations.

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The low emittance and small momentum spread of the proton and deuteron beams of the Cooler Synchrotron COSY combined with the high mass resolution of the COSY-11 detection system permit to study the creation of mesons in the nucleon-nucleon interaction down to the fraction of MeV with respect to the kinematical threshold. At such small excess energies, the ejectiles possess low relative momenta and are predominantly produced with the relative angular momentum equal to zero. Taking advantage of these conditions we have performed investigations aiming to determine the mechanism of the production of eta and eta' mesons in the collision of hadrons as well as the hadronic interaction of these mesons with nucleons and nuclei. In this proceedings we address the ongoing studies of the spin and isospin dependence for the production of the eta and eta' mesons in free and quasi-free nucleon-nucleon collisions.New results on the spin observables for the pp -> pp eta reaction, combined with the previously determined total cross section isospin dependence, reveal a statistically significant indication that the excitation of the nucleon to the S-11( 1535) resonance, the process which intermediates the production of the. meson in the nucleon-nuleon interactions, is predominantly due to the exchange of the p meson between the colliding nucleons.

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