Strong isospin breaking in the decay constants of heavy-light mesons from local-duality QCD sum rules

Author(s)
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Abstract

We explore, by a rather peculiar limit of QCD sum rules subject to a Borel transformation (realized by allowing the related Borel mass parameter to approach infinity), how the small difference of the masses of up and down quark translates into the leptonic decay constants of pseudoscalar or vector heavy-light mesons. For the charmed and bottom mesons, we find that the decay constants of their lowest-lying charged and neutral representatives should differ by an amount of the order of 1 MeV.

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
336
No. of pages
8
DOI
https://doi.org/10.22323/1.336.0116
Publication date
09-2019
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/strong-isospin-breaking-in-the-decay-constants-of-heavylight-mesons-from-localduality-qcd-sum-rules(1d6a0e10-d27e-4685-b069-c2cef0606b3b).html