Based on lattice non-relativistic QCD (NRQCD) studies we present results for Bethe-Salpeter amplitudes for Υ(1S), Υ(2S) and Υ(3S) in vacuum as well as in quark-gluon plasma. Our study is based on 2+1 flavor 483×12 lattices generated using the Highly Improved Staggered Quark (HISQ) action and with a pion mass of 161 MeV. At zero temperature the Bethe-Salpeter amplitudes follow the expectations based on non-relativistic potential models. At non-zero temperatures, the interpretation of Bethe-Salpeter amplitudes turns out to be more nuanced, but consistent with our previous lattice QCD study of excited Upsilons in quark-gluon plasma.
Cite
@article{arxiv.2008.00100,
title = {Bethe-Salpeter amplitudes of Upsilons},
author = {Rasmus Larsen and Stefan Meinel and Swagato Mukherjee and Peter Petreczky},
journal= {arXiv preprint arXiv:2008.00100},
year = {2021}
}
Comments
RevTex, 10pages, 11 figures, minor changes, published version