QCD spectral sum rules 2022

We present a compact review of the status of QCD spectral sum rules until 2022. We emphasize the recent progresses for determining the QCD input parameters (alpha s, running quark masses, quark and gluon condensates) where their correlations have been taken into account. Some selected phenomenological uses of the sum rules in different channels (light and heavy quarks, gluonia/glueballs, hybrids and four-quark states) are briefly reviewed and commented. The estimate of the 1-+ light hybrid mass is revised which confirms the hybrid nature of the 7r1(1600) but not the 7r1(2050).

Automated summary

We provide a concise overview of the current status of QCD spectral sum rules until 2022, with an emphasis on recent advancements in determining the QCD input parameters. We briefly review and comment on selected phenomenological applications of the sum rules in various channels (light and heavy quarks, gluonia/glueballs, hybrids, and four-quark states). The estimate of the 1-+ light hybrid mass is revised, confirming the hybrid nature of 7r1(1600) but not 7r1(2050).