Thermal quarkonium physics in the pseudoscalar channel

Burnier, Y. (Gymnase de Renens, Av. du Silo 1, CH-1020, Renens, Switzerland) ; Ding, H.-T. (Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China) ; Kaczmarek, O. (Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, 430079, China) (Fakultät für Physik, Universität Bielefeld, 33615, Bielefeld, Germany) ; Kruse, A.-L. (Fakultät für Physik, Universität Bielefeld, 33615, Bielefeld, Germany) ; Laine, M. (AEC, ITP, University of Bern, Sidlerstrasse 5, CH-3012, Bern, Switzerland) ; Ohno, H. (Center for Computational Sciences, University of Tsukuba, Ibaraki, 305-8577, Japan) (Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, U.S.A.) ; Sandmeyer, H. (Fakultät für Physik, Universität Bielefeld, 33615, Bielefeld, Germany)

02 December 2017

Abstract: The pseudoscalar correlator is an ideal lattice probe for thermal modifications to quarkonium spectra, given that it is not compromised by a contribution from a large transport peak. We construct a perturbative spectral function incorporating resummed thermal effects around the threshold and vacuum asymptotics above the threshold, and compare the corresponding imaginary-time correlators with continuum-extrapolated lattice data for quenched SU(3) at several temperatures. Modest differences are observed, which may originate from non-perturbative mass shifts or renormalization factors, however no resonance peaks are needed for describing the quenched lattice data for charmonium at and above T ∼ 1.1 T c ∼ 350 MeV. For comparison, in the bottomonium case a good description of the lattice data is obtained with a spectral function containing a single thermally broadened resonance peak.


Published in: JHEP 1711 (2017) 206
Published by: Springer/SISSA
DOI: 10.1007/JHEP11(2017)206
arXiv: 1709.07612
License: CC-BY-4.0



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