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Inclusive ω photoproduction from nuclei and ω in the nuclear medium

  • Regular Article - Hadron Physics
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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 → π0γX) in the vicinity of the ω production region with subsequent ω → π0γ decay. We compare our results with experiment for the distribution of π0γ invariant masses and conclude that the distribution is compatible with an enlarged ω width of about 90MeV 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.

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Authors and Affiliations

  1. Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptd. 22085, 46071, Valencia, Spain

    M. Kaskulov & E. Oset

  2. Grupo de Fısica Nuclear, Departamento de Fisica Fundamental e IUFFyM, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced s/n, E-37008, Salamanca, Spain

    E. Hernandez

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  1. M. Kaskulov
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  2. E. Hernandez
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  3. E. Oset
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Correspondence to M. Kaskulov.

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U.-G. Meißner

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Kaskulov, M., Hernandez, E. & Oset, E. Inclusive ω photoproduction from nuclei and ω in the nuclear medium. Eur. Phys. J. A 31, 245–254 (2007). https://doi.org/10.1140/epja/i2006-10169-6

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  • DOI: https://doi.org/10.1140/epja/i2006-10169-6

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