The ultrafine splitting of heavy quarkonium with next-to-next-to-next-to-next-to-leading-order accuracy

A

bstract

We compute the hyperfine splitting of P-wave heavy quarkonium states with next-to-next-to-next-to-next-to-leading-order accuracy. The resummation of logarithms with next-to-next-to-next-to-next-to-leading-logarithmic accuracy is also addressed. A phenomenological analysis of these results is performed for bottomonium, charmonium and the B _c system. We also apply these results to positronium, muonium, hydrogen and muonic hydrogen.