(en) This paper reports on the charged K/π production ratios and on the shape of the pT distributions of π fluxes measured by the SPY/NA56 experiment for 450 GeV/c proton interactions on beryllium targets. The present data cover a secondary momentum range from 7 GeV/c to 135 GeV/c in the forward direction and with pT values up to 600 MeV/c. An experimental accuracy of about 3% has been achieved. These results will reduce the uncertainty on the estimation of the νe component of neutrino beams.
Brooijmans, G., Grégoire, G., Ambrosini, G., Bernier, K., & et al. (1998). K / pi production ratios from 450-GeV/c protons on beryllium. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B420, 225. https://doi.org/10.1016/S0370-2693(97)01572-4 (Original work published 1998)