The trace amplitude method and its application to the NLO QCD calculation

no code implementations • 4 Jan 2021 • Zi-Qiang Chen, Cong-Feng Qiao

The trace amplitude method (TAM) provides us a straightforward way to calculate the helicity amplitudes with massive fermions analytically.

High Energy Physics - Phenomenology

Scalar Fully-heavy Tetraquark States $QQ^\prime \bar{Q} \bar{Q^\prime}$ in QCD Sum Rules

no code implementations • 8 Dec 2020 • Bo-Cheng Yang, Liang Tang, Cong-Feng Qiao

Additionally, we also analyze the spectra of the $[c\bar{c}][b\bar{b}]$ and $[c\bar{b}] [b \bar{c}]$ tetraquark states, which lie in the range of 12. 51-12. 74 GeV and 12. 49-12. 81 GeV, respectively.

High Energy Physics - Phenomenology