Heavy quarkonia in a baryon asymmetric strongly magnetized hot quark matter (2108.12700v2)

Abstract: Recently there is a resurrection in the study of heavy quark bound states in a hot and baryonless matter with an ambient magnetic field but the matter produced at heavy-ion collider experiments is not perfectly baryonless, so we wish to explore the effect of small baryon asymmetry on the properties of heavy quarkonia immersed in a strongly magnetized hot quark matter. Therefore, we have first revisited the structure of gluon self-energy tensor in the above environment to compute the resummed propagator for gluons. This resummed propagator embodies the properties of medium, which gets translated into the (complex) potential between $Q$ and $\bar Q$ placed in the medium. We observe that the baryon asymmetry makes the real-part of potential slightly more attractive and weakens the imaginary-part. This opposing effects thus lead to the enhancement of binding energies and the reduction of thermal widths of $Q \bar Q$ ground states, respectively. Finally, the properties of quarkonia thus deciphered facilitates to compute the dissociation points of $J/\psi$ and $\Upsilon$, which are found to have slightly larger values in the presence of baryon asymmetry. For example, $J/\psi$ is dissociated at $1.64~T_c$, $1.69~T_c$, and $1.75~T_c$, whereas $\Upsilon$ is dissociated at $1.95~T_c$, $1.97~T_c$ and $2.00 ~T_c$, for $\mu=0, 60$ and $ 100 $ MeV, respectively. This observation prevents early dissociation of quarkonia in the matter produced at ultrarelativistic heavy ion collisions with a small net baryon number, compared to the ideal baryonless matter.