from PHENIX at RHIC (see Fig. 6 in [@6b]) on this effect for $J/\psi $-meson. It is astonishing that this effect has been observed in a wide interval of initial energies. The relative share of Cherenkov effects, described by the parameter $w$ above, can depend on energy.

To conclude, the universal asymmetry of in-medium mesons with an excess over the usual Breit-Wigner form at low masses is predicted as a signature of Cherenkov gluons produced with energies which fit the left wings of resonances.

Let us stress that we do not require $\rho $-mesons or other resonances pre-exist in the medium but imply that they are the modes of its excitation formed during the hadronization process of partons. The Cherenkov gluon emission is a collective response of the quark-gluon medium to impinging partons related to its preconfinement and hadronization properties. It is defined by energy behaviour of the second term in Eq. (\[ren\]).

For the sake of simplicity, Eqs. (\[delt\]) and (\[ren\]) valid at small $\Delta n_R$ typical for gases are used here. The value $n=3$ corresponds to a dense liquid. Therefore, one must use [@9] $$\frac {n^2-1}{n^2+2}=\frac {m_{\pi }^3\nu \alpha }{4\pi }=\sum _R
\frac {2J_R+1}{(2s_1^R+1)(2s_2^R+1)}\cdot \frac {4m_{\pi }^3\Gamma _R 