25–29 Sept 2017
Salamanca, Spain
Europe/Zurich timezone

$\phi$ meson mass and decay width in nuclear matter and nuclei

29 Sept 2017, 12:40
20m
Aula 2.7

Aula 2.7

Talk Hadrons in matter including hypernuclei Hadrons in matter including hypernuclei

Speaker

Dr Javier Cobos-Martinez

Description

The mass and decay width of the $\phi$ 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 $\phi$ self-energy, employing the 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 $\phi$ mass by a few percent, while the decay width is enhanced by an order of magnitude. For a large variation of the cutoff mass parameter, the results for the $\phi$ mass and the decay width turn out to vary very little. Our results support results in the literature which suggest that one should observe a small downward mass shift and a large broadening of the decay width.
In order to explore the possibility of studying the binding and
absorption of $\phi$ mesons in nuclei, we also present the single-particle binding energies and half-widths of $\phi$-nucleus bound states for some selected nuclei.

Primary author

Co-authors

Prof. Kazuo Tsushima (CSSM, Adelaide University) Prof. Gastao Krein (UNESP) Prof. Anthony Thomas (University of Adelaide)

Presentation materials