Influence of $\varphi$ mesons on negative kaons in Ni+Ni collisions at 1.91A GeV beam energy

Abstract

$\varphi$ and K${}^{-}$ mesons from Ni+Ni collisions at the beam energy of 1.91A GeV have been measured by the FOPI spectrometer, with a trigger selecting central and semi-central events amounting to 51% of the total cross section. The phase space distributions, and the total yield of K${}^{-}$, as well as the kinetic energy distribution and the total yield of $\varphi$ mesons are presented. The $\varphi$\K${}^{-}$ ratio is found to be $0.44\pm 0.07(\text{stat}{)}_{-0.12}^{+0.18}(\text{syst})$, meaning that about 22% of K${}^{-}$ mesons originate from the decays of $\varphi$ mesons, occurring mostly in vacuum. The inverse slopes of direct kaons are up to about 15 MeV larger than the ones extracted within the one-source model, signalling that a considerable share of gap between the slopes of K${}^{+}$ and K${}^{-}$ could be explained by the contribution of $\varphi$ mesons to negative kaons.

arXiv comment8 pages, 6 figures

References in corpus (12)

• Modelling the many-body dynamics of heavy ion collisions: Present status and future perspective
• Kaon production in heavy ion reactions at intermediate energies
• Strangeness Production close to Threshold in Proton-Nucleus and Heavy-Ion Collisions
• Phi decay: a relevant source for K- production at SIS energies?
• Production of K+ and of K- Mesons in Heavy-Ion Collisions from 0.6 to 2.0 AGeV Incident Energy
• Direct comparison of phase-space distributions of K- and K+ mesons in heavy-ion collisions at SIS energies - evidence for in-medium modifications of kaons ?
• Production of phi Mesons in Au+Au Collisions at 11.7 A GeV/c
• Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV
• Kaon Pair Production in Proton--Proton Collisions
• Sub-threshold phi-meson yield in central 58Ni+58Ni collisions
• Subthreshold phi-meson production in heavy-ion collisions
• Chiral symmetry and strangeness at SIS energies

Cited by in corpus (7)

• Sub-threshold $\varphi$ and ${\Xi }^{-}$ production by high mass resonances with UrQMD
• Deep sub-threshold ϕ production and implications for the K+/K- freeze-out in Au+Au collisions
• Probing Strangeness Canonical Ensemble with $K^{-}$, $\varphi (1020)$ and ${\Xi }^{-}$ Production in Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}=3\mathrm{GeV}$
• Heavy baryonic resonances, multistrange hadrons, and equilibration at energies available at the GSI Schwerionensynchrotron, SIS18
• Strange meson production in Al+Al collisions at 1.9A GeV
• Wide acceptance measurement of the K${}^{-}$/K${}^{+}$ ratio from Ni+Ni collisions at 1.91A GeV
• Centrality dependence of subthreshold $\varphi$ meson production in Ni+Ni collisions at 1.9A GeV