Charmonium spectral functions in $\bar p A$ collision

TL;DR

This paper investigates how low-lying charmonium states behave in a proton-antiproton collision with gold at 10 GeV, using a transport model to predict observable effects in dilepton spectra for the PANDA experiment.

Contribution

It provides the first detailed study of charmonium spectral functions in $ar p A$ collisions at this energy, with predictions for experimental dilepton signals.

Findings

Significant medium effects on charmonium spectral functions.

Observable modifications in dilepton spectra.

Potential for experimental detection at PANDA.

Abstract

We study the in-medium propagation of low-lying charmonium states: $J/\Psi$, $\Psi$(3686), and $\Psi$(3770) in a $\bar p$ Au $10$ GeV collision. This energy regime will be available for the PANDA experiment. The time evolution of the spectral functions of the charmonium states is studied with a BUU type transport model. We observe a substantial effect of the medium in the dilepton spectrum.