Asymmetry of in-medium rho-mesons as a signature of Cherenkov effects

TL;DR

The paper proposes that Cherenkov gluons cause asymmetries in in-medium rho-meson spectra, leading to observable shifts and flattening near the resonance, which could serve as a signature of Cherenkov effects in nuclear matter.

Contribution

It introduces the idea that Cherenkov gluons contribute to rho-meson spectral asymmetries and predicts specific spectral modifications as experimental signatures.

Findings

Dilepton spectra are flattened near the rho-meson peak.

The rho-meson peak is shifted to lower masses in the presence of Cherenkov gluons.

The asymmetry feature is expected to be common for all resonances.

Abstract

Cherenkov gluons may be responsible for the asymmetry of dilepton mass spectra near rho-meson observed in experiment. They can be produced only in the low-mass wing of the resonance. Therefore the dilepton mass spectra are flattened there and their peak is slightly shifted to lower masses compared with the in-vacuum rho-meson mass. This feature must be common for all resonances.