Transport coefficients of the heavy quark in the domain of the nonperturbative and noneikonal gluon radiation

Drag and diffusion coefficients of the heavy quarks (HQs), such as charm and bottom, are one of the prime tools for discerning the properties of the deconfined quantum chromo-dynamics (QCD) medium created in heavy-ion collision experiments. The innate nonperturbative nature of the QCD medium renders it imperative to estimate the transport coefficients in that domain. The present work evaluates the drag and diffusion coefficients of the moving HQs interacting with the medium particles via two-body collisional and three-body radiative processes to the first order in opacity by employing the Gribov mechanism for the nonperturbative regime. We proffer the latest results of the HQ transport coefficients computed for the nonperturbative and noneikonal gluon radiation off the HQs. The calculations show significant increments of the transport coefficients with the increasing noneikonality by juxtaposing the results with those of the perturbative and eikonal regions. We hope to shed fresh light on explaining the experimental data on the nuclear modification factor <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>R</a:mi><a:mrow><a:mi>A</a:mi><a:mi>A</a:mi></a:mrow></a:msub></a:math> and the elliptic flow <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msub><b:mi>v</b:mi><b:mn>2</b:mn></b:msub></b:math> of the HQs by advocating for the importance of the noneikonality of the gluon radiation off the HQs.