Decay constants of the heavy-light mesons d<sup>(∗)</sup> and b<sup>(</sup>∗<sup>)</sup>: 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), Lomonosov Moscow State University (MSU), 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