zg distribution for heavy flavor jets in dense quark-gluon plasma

We study the zg distribution for heavy flavor, i.e., bottom and charm quark, jets propagating through the dense QCD medium. We extend the late emission approximation for the Armesto-Salgado-Wiedemann formula to heavy flavors. We consider both the normalized and Njet normalized zg distributions, and the ratio of the latter distributions to the vacuum ones, called the R ratio. We demonstrate that since there is no collinear singularity in the medium, there is no principal need to use the Sudakov safety technique for medium-induced emission. We see that contrary to the vacuum case, the normalized zg distribution is sensitive to the dead-cone angle value. In particular, for the case of the Njet normalized distribution with θg≤θcut, it is possible to directly probe the dead-cone gluons in the medium. Our results can be useful to guide the experimental measurements of the heavy flavor jet substructure in a dense QCD medium. Published by the American Physical Society 2025