Mass renormalization group of heavy meson light-cone distribution amplitude in QCD

TL;DR

This paper derives a differential equation describing how the heavy meson light-cone distribution amplitude in QCD evolves with the heavy quark mass, aiding lattice calculations and mass extrapolations.

Contribution

It introduces a novel partial differential equation capturing the mass evolution of the heavy meson LCDA in QCD, connecting internal structures across quark masses.

Findings

Derived a differential equation for mass evolution of LCDA.

Linked heavy meson structures across different quark masses.

Facilitated extrapolation of lattice results to physical quark masses.

Abstract

The heavy meson light-cone distribution amplitude (LCDA), as defined in full QCD, plays a key role in the collinear factorization for exclusive heavy meson production and in lattice computations of the LCDA within heavy-quark effective theory (HQET). In addition to its dependence on the renormalization scale, the QCD LCDA also evolves with the heavy quark mass. We derive a partial differential equation to characterize the mass evolution of the heavy meson QCD LCDA, examining the heavy quark mass dependence through its solution. Our results link the internal structure of heavy mesons across different quark masses, offering significant implications for lattice calculations and enabling the extrapolation of results from lower to higher quark masses.