Hybrid Charmonium at Finite Temperature

TL;DR

This paper investigates the behavior of the exotic $1^{-+}$ charmonium state at finite temperature using lattice QCD techniques, extending zero-temperature methods to finite-temperature conditions for the first time.

Contribution

It introduces the first lattice calculation of the $1^{-+}$ exotic charmonium state at finite temperature using anisotropic ensembles and advanced distillation techniques.

Findings

Insights into the temperature dependence of the $1^{-+}$ spectral function

Implementation of optimal distillation profiles at finite temperature

Analysis of the constant contribution in finite-temperature correlators

Abstract

Drawing upon well established zero-temperature techniques, we present, for the first time in a lattice calculation, insight into the fate of the $1^{-+}$ exotic charmonium state at finite temperature. Specifically, using anisotropic FASTSUM ensembles we employ distillation with a wide operator basis which has been extensively used at zero-temperature by the Hadron Spectrum Collaboration to study the charmonium spectrum. The constant contribution to some finite-temperature temporal correlation functions requires particular care with the extended operator basis common to distillation setups and we discuss this effect. As an alternative to derivative based extended operators, we also consider the use of optimal distillation profiles at finite temperature for the first time. Finally, we remark on the temperature dependence of the $1^{-+}$ spectral function by consideration of the reconstructed correlator method.