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
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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.
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