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Type: Conference paper
Title: Partial restoration of chiral symmetry in cold nuclear matter: the φ-meson case
Other Titles: Partial restoration of chiral symmetry in cold nuclear matter: the phi-meson case
Author: Cobos-Martínez, J.
Tsushima, K.
Krein, G.
Thomas, A.
Citation: Proceedings of the 31st Annual Meeting of the Division of Particles and Fields (DPyC) of the Mexican Physical Society, as published in Journal of Physics: Conference Series, 2017 / vol.912, iss.1, pp.012009-1-012009-10
Publisher: IOP Publishing
Issue Date: 2017
Series/Report no.: Journal of Physics: Conference Series; 912
ISSN: 1742-6588
Conference Name: 31st Annual Meeting of the Division of Particles and Fields (DPyC) of the Mexican Physical Society (24 May 2017 - 26 May 2017 : Mexico City, MEXICO)
Statement of
J J Cobos-Martínez, K. Tsushima, G. Krein and A. W. Thomas
Abstract: The work presented at this workshop is divided into two parts. In the first part, the mass and decay width of the φ-meson in cold nuclear matter are computed in an effective Lagrangian approach. The medium dependence of these properties are obtained by evaluating kaon-antikaon loop contributions to the φ-meson self-energy, employing medium-modified kaon masses calculated using the quark-meson coupling model. The loop integral is regularized with a dipole form factor, and the sensitivity of the results to the choice of cutoff mass in the form factor is investigated. At normal nuclear matter density, we find a downward shift of the phgr mass by a few percent, while the decay width is enhanced by an order of magnitude. Our results support the literature which suggest that one should observe a small downward mass shift and a large broadening of the decay width. In the second part, we present φ-meson-nucleus bound state energies and absorption widths for four selected nuclei, calculated by solving the KleinGordon equation with complex optical potentials. The attractive potential for the φ-meson in the nuclear medium originates from the in-medium enhanced KK loop in the phgr-meson self-energy. The results suggest that the φ-meson should form bound states with all the nuclei considered. However, the identification of the signal for these predicted bound states will need careful investigation because of their sizable absorption widths.
Rights: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
RMID: 0030078407
DOI: 10.1088/1742-6596/912/1/012009
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Appears in Collections:Physics publications

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