Regular Article – Theoretical Physics
Spectral functions of strange vector mesons in asymmetric hyperonic matter
Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, 110 016, New Delhi, India
2 Institute of Physics, 751005, Bhubaneswar, India
Accepted: 20 February 2021
Published online: 20 March 2021
We study the medium modifications of the spectral functions as well as production cross-sections of the strange vector mesons (, and ) in isospin asymmetric strange hadronic matter. These are obtained from the in-medium masses of the open strange mesons and the decay widths , and in the hadronic medium. The decay widths are computed using a field theoretic model of composite hadrons with quark (and antiquark) constituents, from the matrix element of the light quark-antiquark pair creation term of the free Dirac Hamiltonian between the initial and final states. The matrix element is multiplied with a coupling strength parameter for the light quark-antiquark pair creation, which is fitted to the observed vacuum decay width of the decay process. There are observed to be substantial modifications of the spectral functions as well as production cross-sections of these vector mesons due to isospin asymmetry as well as strangeness of the hadronic medum at high densities. These studies should have observable consequences, e.g. in the yield of the hidden and open strange mesons arising from the isospin asymmetric high energy heavy ion collisions at the Compressed baryonic matter (CBM) experiments at the future facility at GSI.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021