The energy dependence of the total cross section for the pp \to pK^+\Lambda reaction was measured in the threshold region covering the excess energy range up to 7MeV. Existing model calculations describe the slope of the measured cross sections well, but are too low by a factor of two to three in rate. The data were used for a precise determination of the beam momentum of the COSY-synchrotron.
@article{arxiv.nucl-ex/9803003,
title = {Total Cross Section of the Reaction pp \to pK^+\Lambda Close to Threshold},
author = {J. T. Balewski and A. Budzanowski and H. Dombrowski and W. Eyrich and C. Goodman and D. Grzonka and J. Haidenbauer and C. Hanhart and J. Hauffe and L. Jarczyk and M. Jochmann and A. Khoukaz and K. Kilian and M. Köhler and A. Kozela and T. Lister and A. Metzger and P. Moskal and W. Oelert and C. Quentmeier and R. Santo and G. Schepers and U. Seddik and T. Sefzick and J. Smyrski and M. Sokołowski and F. Stinzing and A. Strzałkowski and C. Thomas and S. Wirth and M. Wolke and R. Woodward and P. Wüstner and D. Wyrwa},
journal= {arXiv preprint arXiv:nucl-ex/9803003},
year = {2009}
}