Decay constants of the heavy-light mesons d<sup>(∗)</sup> and b<sup>(</sup>∗<sup>)</sup>: Isospin breaking

Autor(en)
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Abstrakt

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(en)
Teilchenphysik
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Universität Wien, Istituto Nazionale di Fisica Nucleare (INFN), Roma
Journal
Proceedings of Science (PoS)
Band
314
Anzahl der Seiten
4
DOI
https://doi.org/10.22323/1.314.0669
Publikationsdatum
2018
Peer-reviewed
Ja
ÖFOS 2012
103034 Teilchenphysik
ASJC Scopus Sachgebiete
General
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/decay-constants-of-the-heavylight-mesons-d-and-b-isospin-breaking(17edf410-07c8-4c0f-a061-a4d1ea38f9aa).html