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Open Access item Inclusive ω photoproduction from nuclei and ω in the nuclear medium

Authors:Kaskulov, Murat
Hernández, Eliecer
Oset, Eulogi
Keywords:Vector mesons, Walecka model, Bound states, [PACS] Nuclear tests of fundamental interactions and symmetries, [PACS] Photonuclear reactions, [PACS] Chiral symmetries, [PACS] Meson production
Issue Date:1-Feb-2007
Publisher:Società Italiana di Fisica
Citation:European Physical Journal A 31(2): 245-254 (2007)
Abstract:With the aim of extracting information on the shift of the ω mass in the nuclear medium we analyze data obtained at ELSA from where claims for evidence of a mass shift of the ω have been made. We develop a Monte Carlo simulation code which takes into account the possible reactions in the experimental set-up of (γA --> π(0)γX) in the vicinity of the ω production region with subsequent ω --> π(0)γ decay. We compare our results with experiment for the distribution of π(0)γ invariant masses and conclude that the distribution is compatible with an enlarged ω width of about 90 MeV at nuclear-matter density and no shift in the mass. This change in the width would be compatible with the preliminary results obtained from the transparency ratio in the A-dependence of ω production. The discrepancy of the present conclusions with former claims of an evidence for a shift of the ω mass stems from a different choice of background which is discussed in the paper.
Description:10 pages, 6 figures.-- PACS nrs.: 24.80.+y, 25.20.-x, 11.30.Rd, 13.60.Le.-- ISI Article Identifier: 000244305700014.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0610067
Publisher version (URL):http://dx.doi.org/10.1140/epja/i2006-10169-6
ISSN:1434-6001 (Print)
1434-601X (Online)
Appears in Collections:(IFIC) Artículos

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