We present the first complete next-to-leading-order (NLO) QCD calculation of the fully charm tetraquark radiative decays $T_{4c}(0^{++},2^{++})\to\gamma J/\psi$ and $T_{4c}(1^{+-})\to\gamma\eta_c$ at leading order in the relative velocity. The NLO widths are $2.3$--$3.1$ times the leading-order (LO) widths for the long...
Xiang Li, Yan-Qing Ma, Bo-Xuan Shi et al.· 0 citations
We propose an analyticity bootstrap method to determine the reduction of Feynman integrals (FIs). The key observation is that, at any kinematic point, a dimensionally regularized FI possesses a Taylor expansion region (analytic region), and the finiteness of the Taylor region strongly constrains the integral reduction...
Motivated by recent LHC observations of a threshold enhancement in the $t\bar t$ system consistent with toponium-like dynamics, we compute the next-to-next-to-leading order (NNLO) QCD correction to the hard short-distance coefficient for $\eta_t\to HZ$, where $\eta_t$ denotes the pseudoscalar color-singlet configuratio...
Cai-Ping Jia, Yan-Qing Ma, Huai-Min Yu et al.· 0 citations
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