Measurement of the in-medium K0 inclusive cross section in pi- -induced reactions at 1.15-GeV/c

The FOPI collaboration Benabderrahmane, M.L. ; Herrmann, N. ; Wisniewski, K. ; et al.
Phys.Rev.Lett. 102 (2009) 182501, 2009.
Inspire Record 791227 DOI 10.17182/hepdata.52378

The K0 meson production by pi- mesons of 1.15 GeV/c momentum on various nuclear targets was measured with the FOPI spectrometer at the SIS accelerator of GSI. Inclusive production cross-sections and the momentum distributions of K0 mesons are compared to the elementary production cross-sections and to QMC and HSD model predictions. The results point to modifications of the elementary reactions amplitudes inside nuclei and to the existence of a repulsive KN potential of about 20 MeV at normal nuclear matter density.

2 data tables

Inclusive K0 cross section as a function of the mass of the target nucleus.

The ratio of K0 yields produced by pions on heavy(PB) and light(C) targets as a function of the K0 lab. momentum.


K+ production in the reaction Ni-58 + Ni-58 at incident energies from 1-A/GeV to 2-A/GeV

The FOPI collaboration Best, D. ; Herrmann, N. ; Hong, B. ; et al.
Nucl.Phys. A625 (1997) 307-324, 1997.
Inspire Record 441884 DOI 10.17182/hepdata.36288

Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of $~{58}$Ni with $~{58}$Ni nuclei. The transverse mass ($m_t$) spectra have been studied as a function of rapidity at a beam energy 1.93 AGeV. The $m_t$ distributions of K~+ mesons are well described by a single Boltzmann-type function. The spectral slopes are similar to that of the protons indicating that rescattering plays a significant role in the propagation of the kaon. Multiplicity densities have been obtained as a function of rapidity by extrapolating the Boltzmann-type fits to the measured distributions over the remaining phase space. The total K~+ meson yield has been determined at beam energies of 1.06, 1.45, and 1.93 AGeV, and is presented in comparison to existing data. The low total yield indicates that the K~+ meson can not be explained within a hadro-chemical equilibrium scenario, therefore indicating that the yield does remain sensitive to effects related to its production processes such as the equation of state of nuclear matter and/or modifications to the K~+ dispersion relation.

1 data table

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