Abstract
The dead-cone effect has been predicted to reduce the magnitude of energy loss and jet quenching for heavy flavors produced with large ${p}_{T}$ in heavy-ion collisions. On the contrary, data from the Relativistic Heavy Ion Collider demonstrate a strong suppression of high-${p}_{T}$ electrons from charm and bottom decays. We show that vacuum radiation of a highly virtual quark produced at high ${p}_{T}$ with a stripped-off color field develops a much wider dead cone, which screens the one related to the quark mass. Lacking the field, gluons cannot be radiated within this cone until the color field is regenerated and the quark virtuality cools down to the scale of the order of the quark mass. However, this takes longer than is essential for the observed jet quenching, leading to similar nuclear effects for the light and charm quark jets. Open beauty is expected to radiate much less within the ${p}_{T}$ range studied so far in heavy-ion collisions.
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