Decay constants of the heavy-light mesons d^(∗) and b⁽∗⁾: Isospin breaking

Author(s)

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

Abstract

QCD sum rules are analytic predictions of hadron observables from quantum chromodynamics. In the so-called local-duality limit of their Borel-transformed form, all nonperturbative contributions are encompassed by just a single quantity, an effective threshold beyond which, by assumption, all hadronic contributions are reliably described by perturbative QCD. Reconstructing its quark-mass dependence enables us to investigate the differences of the leptonic decay constants of heavy–light mesons effectuated by the tiny isospin-violating discrepancy of the masses of up and down quarks. By and large, our findings enjoy excellent agreement with the outcomes of earlier studies, the only exception being a lattice-QCD prediction for the B mesons, where we find dramatic disagreement.

Organisation(s)

Particle Physics

External organisation(s)

Österreichische Akademie der Wissenschaften (ÖAW), Anuchin Research Institute and Museum of Anthropology, Universität Wien, Istituto Nazionale di Fisica Nucleare (INFN), Roma

Journal

Proceedings of Science (PoS)

Volume

314

No. of pages

4

DOI

https://doi.org/10.22323/1.314.0669

Publication date

2018

Peer reviewed

Yes

Austrian Fields of Science 2012

103034 Particle physics

ASJC Scopus subject areas

General

Portal url

https://ucris.univie.ac.at/portal/en/publications/decay-constants-of-the-heavylight-mesons-d-and-b-isospin-breaking(17edf410-07c8-4c0f-a061-a4d1ea38f9aa).html