Kaon pair production in proton-proton collisions

+2p+K%2B+K%22&type=SU">p p --> 2p K+ K, hadronic decay [Phi(1020)], (2p K) [mass spectrum], Pair production, inelastic scattering [p p], Atomic physics, Nucleon -->
Popis: The differential and total cross sections for kaon pair production in the pp->ppK+K- reaction have been measured at three beam energies of 2.65, 2.70, and 2.83 GeV using the ANKE magnetic spectrometer at the COSY-Juelich accelerator. These near-threshold data are separated into pairs arising from the decay of the phi-meson and the remainder. For the non-phi selection, the ratio of the differential cross sections in terms of the K-p and K+p invariant masses is strongly peaked towards low masses. This effect can be described quantitatively by using a simple ansatz for the K-p final state interaction, where it is seen that the data are sensitive to the magnitude of an effective K-p scattering length. When allowance is made for a small number of phi events where the K- rescatters from the proton, the phi region is equally well described at all three energies. A very similar phenomenon is discovered in the ratio of the cross sections as functions of the K-pp and K+pp invariant masses and the identical final state interaction model is also very successful here. The world data on the energy dependence of the non-phi total cross section is also reproduced, except possibly for the results closest to threshold.
12 two-column pages, 12 figures, 1 table
Jazyk: English
DOI: 10.1103/PhysRevC.77.015204
Přístupová URL adresa: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a8199c959a1ea8bd38f63287d52a098f
https://juser.fz-juelich.de/record/2341
Rights: OPEN
Přírůstkové číslo: edsair.doi.dedup.....a8199c959a1ea8bd38f63287d52a098f
Autor: Andreas Mussgiller, P. Wüstner, V. Kleber, D. Prasuhn, B. Lorentz, M. Hartmann, H.R. Koch, V. Hejny, T. Mersmann, M. Nekipelov, Markus Büscher, R. Schleichert, S. Barsov, Colin Wilkin, Yoshikazu Maeda, Yu. Valdau, A. Dzyuba, H. J. Stein, A.K. Kacharava, S. Mikirtytchiants, H. Ströher, I. Keshelashvili, V. Koptev, P. Kulessa, M. Drochner, H. Ohm
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Zdroj: Physical review / C 77(1), 015204 (2008). doi:10.1103/PhysRevC.77.015204
DOI: 10.1103/PhysRevC.77.015204
Popis: The differential and total cross sections for kaon pair production in the pp->ppK+K- reaction have been measured at three beam energies of 2.65, 2.70, and 2.83 GeV using the ANKE magnetic spectrometer at the COSY-Juelich accelerator. These near-threshold data are separated into pairs arising from the decay of the phi-meson and the remainder. For the non-phi selection, the ratio of the differential cross sections in terms of the K-p and K+p invariant masses is strongly peaked towards low masses. This effect can be described quantitatively by using a simple ansatz for the K-p final state interaction, where it is seen that the data are sensitive to the magnitude of an effective K-p scattering length. When allowance is made for a small number of phi events where the K- rescatters from the proton, the phi region is equally well described at all three energies. A very similar phenomenon is discovered in the ratio of the cross sections as functions of the K-pp and K+pp invariant masses and the identical final state interaction model is also very successful here. The world data on the energy dependence of the non-phi total cross section is also reproduced, except possibly for the results closest to threshold.
12 two-column pages, 12 figures, 1 table
Databáze: OpenAIRE
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