Dr Binoy Krishna Patra (Indian Institute of Technology Roorkee)
We have investigated the properties of quarkonia in a complex potential which is obtained by the in-medium corrections to both the perturbative and nonperturbative term in the potential through the dielectric function in real-time formalism. In isotropic medium, the real-part of the potential becomes stronger and thus makes the quarkonia more bound whereas the (magnitude) imaginary-part too becomes larger and thus contribute more to the thermal width, compared to the in-medium correction of the Coulomb term alone. With these cumulative observations, we studied the dissociation where a resonance is said to be dissolved in a medium when its binding energy decreases with temperature and eventually becomes equal to its width and have found that the bound states are now dissociated at higher temperature, in the absence of nonperturbative term. Finally we extend our calculation to a medium which exhibits a local momentum anisotropy and calculate both the real- and imaginary-part of potential, by the leading anisotropic corrections to the propagators. The presence of anisotropy makes the real-part of the potential more stronger while the imaginary-part is weakened slightly and hence width of a particular resonance becomes narrower, compared to an isotropic medium. However, since the temperature corrections to the imaginary-part is a small perturbation to the vacuum part, so overall the anisotropy makes the dissociation temperatures higher, compared to isotropic medium.
Dr Binoy Krishna Patra (Indian Institute of Technology Roorkee) Ms Lata Thakur (Indian Institute of Technology Roorkee) Mr Uttam Kakade (Indian Institute of Technology Roorkee)