Probing the strange quark condensate by di-electrons from phi meson decays in heavy-ion collisions at SIS energies

Abstract

QCD sum rules predict that the change of the strange quark condensate $<\bar{s}s>$ in hadron matter at finite baryon density causes a shift of the peak position of the di-electron spectra from $\varphi$ meson decays. Due to the expansion of hadron matter in heavy-ion collisions, the $\varphi$ peak suffers a smearing governed by the interval of density in the expanding fireball, which appears as effective broadening of the di-electron spectrum in the $\varphi$ region. The emerging broadening is sensitive to the in-medium change of $<\bar{s}s>$. This allows to probe directly in-medium modifications of $<\bar{s}s>$ via di-electron spectra in heavy-ion collisions at SIS energies with HADES.

Cited by in corpus (9)

• Mass dependence of inclusive nuclear $\varphi$ photoproduction
• Constraining the strangeness content of the nucleon by measuring the $\varphi$ meson mass shift in nuclear matter
• D meson mass increase by restoration of chiral symmetry in nuclear matter
• The $\varphi$ meson with finite momentum in a dense medium
• Role of phi decays for K- yields in relativistic heavy-ion collisions
• Phi meson production in near threshold proton-nucleus collisions
• Analysis of spectral modification of $\varphi$ mesons at finite density using a transport approach in the 12 GeV pA reactions
• Studying the in-medium $\varphi$ meson spectrum through kaons in proton-nucleus reactions
• Absorption of phi mesons in near-threshold proton-nucleus reactions