Masses of open-flavour heavy-light hybrids from QCD sum-rules

作者：Ho J; Harnett D; Steele T G

来源：The Journal of High Energy Physics, 2017, 2017(5): 149.

DOI：10.1007/JHEP05(2017)149

• QCD Phenomenology

We use QCD Laplace sum-rules to predict masses of open-flavour heavy-light hybrids where one of the hybrid's constituent quarks is a charm or bottom and the other is an up, down, or strange. We compute leading-order, diagonal correlation functions of several hybrid interpolating currents, taking into account QCD condensates up to dimension-six, and extract hybrid mass predictions for all J(P) is an element of{ 0 +/- 1 +/-}, as well as explore possible mixing effects with conventional quark-antiquark mesons. Within theoretical uncertainties, our results are consistent with a degeneracy between the heavy-nonstrange and heavy-strange hybrids in all J(P) channels. We find a similar mass hierarchy of 1(+), 1(-), and 0(+) states ( a 1 (+) state lighter than essentially degenerate 1(-) and 0 (+) states) in both the charm and bottom sectors, and discuss an interpretation for the 0(-) states. If conventional meson mixing is present the effect is an increase in the hybrid mass prediction, and we estimate an upper bound on this effect.

• 出版日期2017-5-29