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