Browsing by Author "HADES collaboration (109 authors)"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Inclusive $\Lambda$ production in proton-proton collisions at 3.5 GeVPublication . HADES collaboration (109 authors); Blanco, A.; Bordalo, P.; Fonte, P.; Franco, C.; Lopes, L.; Mangiarotti, A.; Ramos, S.; Silva, L.The inclusive production of Λ hyperons in proton-proton collisions at s=3.18GeV was measured with HADES at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt. The experimental data are compared to a data-based model for individual exclusive Λ production channels in the same reaction. The contributions of intermediate resonances such as Σ(1385), Δ++, or N* are considered in detail. In particular, the result of a partial-wave analysis accounts for the abundant pK+Λ final state. Model and data show a reasonable agreement at midrapidities, while a difference is found for larger rapidities. A total Λ production cross section in p+p collisions at s=3.18GeV of σ(p+p→Λ+X)=207.3±1.3−7.3+6.0(stat.)±8.4(syst.)−0.5+0.4(model.)μb is found.
- $\Sigma^0$ production in proton nucleus collisions near thresholdPublication . HADES collaboration (109 authors); Blanco, A.; Bordalo, P.; Fonte, P.; Franco, C.; Lopes, L.; Mangiarotti, A.; Ramos, S.; Silva, L.The production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to sNN=3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Σ0 s were identified via the decay Σ0→Λγ with subsequent decays Λ→pπ− in coincidence with a e+e− pair from either external ( γ→e+e− ) or internal (Dalitz decay γ⁎→e+e− ) gamma conversions. The differential Σ0 cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5