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Inclusive K+ meson production in proton nucleus interactions.

Buescher, Markus ; Koptev, V. ; Nekipelov, M. ; et al.

Eur.Phys.J.A 22 (2004) 301-317, 2004.

Inspire Record 643363 DOI 10.17182/hepdata.43537

The production of K^+ mesons in pA (A = D, C, Cu, Ag, Au) collisions has been investigated at the COoler SYnchrotron COSY-Julich for beam energies T_p = 1.0 - 2.3 GeV. Double differential inclusive pC cross sections at forward angles theta < 12 degrees as well as the target-mass dependence of the K^+ momentum spectra have been measured with the ANKE spectrometer. Far below the free NN threshold at T_{NN}=1.58 GeV the spectra reveal a high degree of collectivity in the target nucleus. From the target-mass dependence of the cross sections at higher energies, the repulsive in-medium potential of K^+ mesons can be deduced. Using pN cross-section parameterisations from literature and our measured pD data we derive a cross-section ratio of sigma(pn -> K^+ X) / sigma(pp -> K^+ X) ~ (3-4).

8 data tables

Table 1

Double differential cross section for P C --> K+ X obtained in the 1.3 T mode. Errors do not include systematic uncertainties.

Table 2

Double differential cross section for P C --> K+ X obtained in the 1.6 T mode. Errors do not include systematic uncertainties.

Table 3

Cross section ratios CU/C and AU/C measured with the 1.3 T mode. Errors include statistical and systematic uncertainties.