EPJ Web of Conferences
Volume 36, 2012Resonance Workshop at UT Austin
|Number of page(s)||8|
|Published online||29 November 2012|
Recent results on pp → ppϕ/K+K− production and the momentum dependence of ϕ-meson nuclear transparency
1 Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
2 Institut für Kern- und Hadronenphysik, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
3 Institute for Theoretical and Experimental Physics, RU-117218 Moscow, Russia
4 Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
5 Departament d'Estructura i Constituents de la Matèrria and Institut de Ciències del Cosmos, Universitat de Barcelona, E-08028 Barcelona, Spain
6 Institute for Nuclear Research, Russian Academy of Sciences, RU-117312 Moscow, Russia
7 Departamento de F´?sica, Universidad de Murcia, E-30071 Murcia, Spain
8 Institut f¨ur Theoretische Physik, TU Dresden, D-01062 Dresden, Germany
9 Physics and Astronomy Department, UCL, London WC1E 6BT, United Kingdom
10 Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC 27708, USA
a e-mail: email@example.com
Kaon pair production by 2.83 GeV protons has been investigated in two experiments using the ANKE magnetic spectrometer at COSY-Jülich:
(1) Differential and total cross sections for the pp → ppK+ K− reaction are separated into kaon pairs arising from the decay of the ϕ-meson and the remainder. The measurements show that higher partial waves represent the majority of the pp → ppϕ cross section at an excess energy of 76 MeV. Taken together with existing low energy ANKE data, the energy dependence of the results seem to suggest some S-wave ϕp enhancement near threshold. The non-ϕ K+K− data can be described in terms of the combined effects of two-body final state interactions, using the same effective scattering parameters already determined from lower energy ANKE data.
(2) The inclusive production of ϕ mesons on C, Cu, Ag, and Au targets has also been studied using the K+K− decay to detect the ϕ. The momentum dependence of the nuclear transparency ratio, the in-medium ϕ width, and the differential cross section for ϕ meson production at forward angles have been determined for these nuclei in the momentum range of 0.6 – 1.6 GeV/c. There are indications of a significant momentum dependence in the values extracted for the ϕ width, which on average exceed the free value by about an order of magnitude. The results are compared with data from other experiments at slightly higher momenta.
© Owned by the authors, published by EDP Sciences, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.