Jichen Pan

activity

20242026

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hep-ph2026

Direct renormalization of flavor-changing currents in vNRQCD for $B_{c}^{(*)}$ decays

Jichen Pan

We present a direct vNRQCD calculation of the two-loop anomalous dimensions of the leading flavor-changing nonrelativistic currents that govern the leptonic decays of the $B_{c}$ and…

hep-ph2025

Optimized QCD two-loop correction to exclusive double $J / I ¨ $ production at B factories

Wen-Long Sang, Feng Feng, Yu Jia +3

We report the calculation of the process $e^{+} e^{-} \to J / I ¨ J / I ¨ $ up to next-to-next-to-leading order (NNLO) at a center-of-mass (CM) energy of $s = 10.58$ GeV. We employ an imp…

hep-ph2024

A tale of Bethe logarithms: leptonic widths of $I ¨ _{c J}$ and Lamb shift

Yu Jia, Jichen Pan

The rare annihilation decays of $P$ -wave spin-triplet quarkonia into lepton pair have to proceed via two-photon intermediate state, which are plagued with the infrared divergence s…

Direct renormalization of flavor-changing currents in vNRQCD for Bc(∗)​ decays

Optimized QCD two-loop correction to exclusive double J/I¨ production at B factories

A tale of Bethe logarithms: leptonic widths of I¨cJ​ and Lamb shift

Direct renormalization of flavor-changing currents in vNRQCD for $B_{c}^{(*)}$ decays

Optimized QCD two-loop correction to exclusive double $J / I ¨ $ production at B factories

A tale of Bethe logarithms: leptonic widths of $I ¨ _{c J}$ and Lamb shift