Near threshold production of η-mesons in proton neutron collisions at ANKE
نویسندگان
چکیده
منابع مشابه
Near-Threshold η Meson Production in Proton–Proton Collisions
The production of η mesons has been measured in the proton-proton interaction close to the reaction threshold using the COSY-11 internal facility at the cooler synchrotron COSY. Total cross sections were determined for eight different excess energies (ǫ) in the range from ǫ = 0.5 MeV to ǫ = 5.4 MeV. The energy dependence of the total cross section is well described by the available phase–space ...
متن کاملProduction of η Mesons Near Threshold
It is argued that the strong energy dependence of the p d → 3Heη cross section near threshold is due to a final state interaction between the η meson and the 3He nucleus. The large scattering length that this implies is in accord with optical potential predictions and is evidence for a nearby virtual ‘‘bound’’ state in the η3He system. This model suggests that sharp structures should also be se...
متن کاملNear-threshold Production of Η-mesons
It is shown that the striking energy variation in the p d → 3He η cross section near threshold is probably due to a final state interaction associated with a large (complex) η − 3He scattering length. The consequences of this hypothesis are studied for the production of the meson in the η − 4He and η − 7Be channels. PACS number(s): 25.40.Ve, 13.75.-n, 25.10.+s The cross sections for the product...
متن کاملKaon pair production in proton-proton collisions at COSY-ANKE
The near-threshold production of kaon-pairs has been investigated in protonproton collisions at Cooler Synchrotron (COSY)at Forschungszentrum Jülich. In the pp → ppKK reaction, the invariant mass distributions of Kp, Kpp, and KK indicate the presence of both Kp and KK final state interactions. Total cross sections for pp → ppφ reaction have been determined at excess energies ε of 18.5, 34.5, an...
متن کاملInstantons and η Meson Production near threshold in NN collisions
An enhancement for the η production in proton-neutron collisions as compared with that in proton-proton scattering has been recently observed. We present a calculation for the production cross section, in proton-neutron collisions near threshold, within instanton model for the QCD vacuum and show that a specific flavor dependent nonperturbative quark-gluon interaction related to instantons is a...
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ژورنال
عنوان ژورنال: EPJ Web of Conferences
سال: 2016
ISSN: 2100-014X
DOI: 10.1051/epjconf/201613003008