This title appears in the Scientific Report :
2003
Please use the identifier:
http://hdl.handle.net/2128/10705 in citations.
Please use the identifier: http://dx.doi.org/10.1140/epja/i2002-10234-2 in citations.
Associated strangeness production at threshold
Associated strangeness production at threshold
The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon and the K (+) K- meson pair production. Measurements of the near-threshold Lambda and Sigma(o) production via the pp --> pK(+) Lambda/Sigma(0) reaction (S. Sewerinet al., Phys. Rev....
Saved in:
Personal Name(s): | Kowina, P. |
---|---|
Wolke, M. / Adam, H.-H. / Budzanowski, A. / Czyzykiewicz, R. / Grzonka, D. / Janusz, M. / Jarczyk, L. / Kamys, B. / Khoukaz, A. / Kilian, K. / Lister, T. / Moskal, P. / Oelert, W. / Rozek, T. / Santo, R. / Schepers, G. / Sefzick, N. Y. / Siemaszko, M. / Smyrski, J. / Steltenkamp, A. L. / Strzalkowski, A. / Winter, P. / Wüstner, P. / Zipper, W. | |
Contributing Institute: |
Institut 1 (Experimentelle Kernphysik I); IKP-E-I |
Published in: | The @European physical journal / A, 18 (2003) S. 351 - 354 |
Imprint: |
Berlin
Springer
2003
|
Physical Description: |
351 - 354 |
DOI: |
10.1140/epja/i2002-10234-2 |
Document Type: |
Journal Article |
Research Program: |
Physik der Hadronen |
Series Title: |
European Physical Journal A
18 |
Subject (ZB): | |
Link: |
Get full text OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1140/epja/i2002-10234-2 in citations.
The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon and the K (+) K- meson pair production. Measurements of the near-threshold Lambda and Sigma(o) production via the pp --> pK(+) Lambda/Sigma(0) reaction (S. Sewerinet al., Phys. Rev. Lett. 83, 682 (1999)) at COSY-11 have shown that the Lambda/Sigma(o) cross-section ratio exceeds the value at high excess energies (Q greater than or equal to 300 MeV (A. Baldiniet al., Total Cross-Sections for Reactions of High-Energy Particles, Landolt-Bornstein, New Series, Vol. I/12 (Springer, Berlin, 1988))) by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. The near-threshold production of the charged kaon-antikaon pair is related to the discussion about the nature of the scalar states in the 1 GeV/c(2) mass range, i.e. the f(0)(980) and a(0)(980) (O. Krehl, R. Rapp, J. Speth, Phys. Lett. B 390, 23 (1997)). The interpretation as a K (K) over bar molecule is strongly dependent on the K-(K) over bar interaction which can be studied via the production channel. A first total cross-section value on the reaction pp --> pp K+ K- at an excess energy of 17 MeV (C. Quentmeieret al., Phys. Lett. B 515, 276 (2001)), i.e. below the phi production threshold, was measured. |