Charmed Pseudoscalar and Vector Mesons: a Comprehensive QCD Sum-Rule View of Their Decay Constants

TL;DR

This paper reviews the application of QCD sum rules to determine decay constants of charmed pseudoscalar and vector mesons, highlighting methodological challenges and providing a comprehensive analysis of their differences.

Contribution

It offers a detailed reassessment of QCD sum-rule techniques for extracting decay constants of charmed mesons, emphasizing the distinct challenges for pseudoscalar and vector states.

Findings

Different challenges in extracting decay constants for pseudoscalar and vector mesons.

A comprehensive review of QCD sum-rule applications to charmed mesons.

Insights into methodological considerations for accurate decay constant determination.

Abstract

In spite of undeniable similarities of the applied techniques, somewhat different challenges are encountered when extracting, from QCD sum rules derived from two-point correlators of appropriate interpolating heavy-light quark currents, the decay constants of charmed mesons of pseudoscalar nature, on the one hand, or of vector nature, on the other hand. This observation justifies a rather careful reassessment of the corresponding results.