This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.1140/epja/i2006-10216-4 in citations.
Please use the identifier: http://hdl.handle.net/2128/10613 in citations.
K(K)over-bar photoproduction from protons
K(K)over-bar photoproduction from protons
We study the contribution of the Drell mechanism driven by K+ and K- exchange to the reaction gamma N K (K) over barN. Our calculation implements the full KN and KN reaction amplitudes in the form of partial- wave amplitudes taken from a meson-exchange model (KN) and a partial-wave analysis ((K) ov...
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Personal Name(s): | Sibirtsev, A. |
---|---|
Haidenbauer, J. / Krewald, S. / Meissner, U.G. / Thomas, A. W. | |
Contributing Institute: |
Institut 3 (Theoretische Kernphysik); IKP-3 Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM |
Published in: | The @European physical journal / A, 31 (2007) S. 221 - 232 |
Imprint: |
Berlin
Springer
2007
|
Physical Description: |
221 - 232 |
DOI: |
10.1140/epja/i2006-10216-4 |
Document Type: |
Journal Article |
Research Program: |
Physik der Hadronen und Kerne |
Series Title: |
European Physical Journal A
31 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/10613 in citations.
We study the contribution of the Drell mechanism driven by K+ and K- exchange to the reaction gamma N K (K) over barN. Our calculation implements the full KN and KN reaction amplitudes in the form of partial- wave amplitudes taken from a meson-exchange model (KN) and a partial-wave analysis ((K) over barN), respectively. Comparing our results to data of the LAMP2 Collaboration we observe that the Drell mechanism alone cannot describe the large Lambda(1520) photoproduction rate observed experimentally. We argue that the discrepancy could be due to significant contributions from K* meson exchange with subsequent excitation of the Delta(1520)-resonance. After adding such contributions to our model a good agreement of the LAMP2 experiment is achieved. When applying the same model to the recent SAPHIR data we find an excellent description of the K+ p spectrum and find indications for a hyperon resonance with M (R) = 1617MeV and Gamma(R) = 117MeV in the K- p mass distribution. |