In-medium ϕ meson width extracted from proton-nucleus collisions
1 Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
2 Institute for Theoretical and Experimental Physics, RU-117312 Moscow, Russia
3 Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany
4 Departament d’Estructura i Constituents de la Materia and Institut de Ciencies del Cosmos, Universitat de Barcelona, E-08028 Barcelona, Spain
5 Institute for Nuclear Research, Russian Academy of Science, RU-117312 Moscow, Russia
6 Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain
7 Physics and Astronomy Department, UCL, London WC1E 6BT, United Kingdom
a e-mail: email@example.com
The inclusive production of ϕ mesons at small angles in proton collisions with C, Cu, Ag, and Au targets has been measured at an incident energy of 2.83 GeV at the ANKE-COSY facility. The ϕ mesons were registered via the ϕ → K+K− decay. The momentum dependence of the nuclear transparency ratio, the in-medium ϕ width, and the differential cross section for ϕ production have been determined in the momentum region pϕ = 0.6 − 1.6 GeV/c. Comparison with different model calculations suggests a significant broadening of the in-medium ϕ width for normal nuclear density with evidence for a momentum dependence.
© Owned by the authors, published by EDP Sciences, 2012
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.