Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2001-07-16
Phys.Rev. C65 (2002) 014603
Physics
Nuclear Physics
Nuclear Experiment
9 Pages, 11 Figures
Scientific paper
10.1103/PhysRevC.65.014603
Total and differential cross sections from literature, on the production of K+ mesons in pA interactions at projectile energies between T=0.8 and 2.9 GeV, covering the transition across the free nucleon-nucleon threshold at 1.58 GeV, have been investigated. From the target-mass dependence of the production cross sections no evidence for the expected change of the dominant reaction mechanism from two-step to direct kaon production was found. At T=1.0 GeV the A dependences of the total cross sections and of the most recent data from COSY-Juelich, differential cross sections measured under forward angles, are strongly different. The invariant K+ production cross sections show an overall exponential scaling behavior with the squared four-momentum transfer between the beam proton and the produced K+ meson for t< -0.05 GeV^2 independent of the beam energy and emission angle. The data from COSY-Juelich reveal a strongly different t dependence in the region of t>0 GeV^2. Further data at forward angles and different beam energies should be taken in order to explore this region of kinematically extreme conditions.
Buescher Markus
Ioffe Lev B.
Koptev V.
Nekipelov M.
Sibirtsev Alexander
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