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Recent results on pp → ppθ/K+K-production and the momentum dependence of θ-meson nuclear transparency.
- Source :
-
EPJ Web of Conferences . 2012, Issue 36, p00011-p.1-00011-p.8. 8p. - Publication Year :
- 2012
-
Abstract
- Kaon pair production by 2.83 GeV protons has been investigated in two experiments using the ANKE magnetic spectrometer at COSY-Jülich: (1) Differential and total cross sections for the pp → ppK+K- reaction are separated into kaon pairs arising from the decay of the θ-meson and the remainder. The measurements show that higher partial waves represent the majority of the pp → ppθ cross section at an excess energy of 76 MeV. Taken together with existing low energy ANKE data, the energy dependence of the results seem to suggest some S-wave θp enhancement near threshold. The non-θ K+K- data can be described in terms of the combined effects of two-body final state interactions, using the same effective scattering parameters already determined from lower energy ANKE data. (2) The inclusive production of θ mesons on C, Cu, Ag, and Au targets has also been studied using the K+K- decay to detect the θ. The momentum dependence of the nuclear transparency ratio, the in-medium θ width, and the differential cross section for θ meson production at forward angles have been determined for these nuclei in the momentum range of 0.6 - 1.6 GeV/c. There are indications of a significant momentum dependence in the values extracted for the θ width, which on average exceed the free value by about an order of magnitude. The results are compared with data from other experiments at slightly higher momenta. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MESONS
*KAONS
*MAGNETIC spectrometer
*COLLISIONS (Nuclear physics)
*NUCLEAR physics
Subjects
Details
- Language :
- English
- ISSN :
- 21016275
- Issue :
- 36
- Database :
- Academic Search Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 84419225
- Full Text :
- https://doi.org/10.1051/epjconf/20123600011