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Inclusive ω photoproduction from nuclei and ω in the nuclear medium

AuthorsKaskulov, Murat; Hernández, Eliecer; Oset, Eulogi
KeywordsVector mesons
Walecka model
Bound states
[PACS] Nuclear tests of fundamental interactions and symmetries
[PACS] Photonuclear reactions
[PACS] Chiral symmetries
[PACS] Meson production
Issue Date1-Feb-2007
PublisherSocietà Italiana di Fisica
CitationEuropean Physical Journal A 31(2): 245-254 (2007)
AbstractWith 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.
Description10 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
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