Journal article

Publication year: 2022

Journal: Physics Letters B

Volume number: 833

ISSN: 0370-2693

eISSN: 1873-2445

Open access status: Gold

DOI Link: https://doi.org/10.1016/j.physletb.2022.137291

Publisher: Elsevier

Abstract: 
We study electromagnetic as well as strong isospin breaking effects in the isospin mass splittings of light pseudoscalar and vector mesons. To this end we employ a coupled system of quark Dyson-Schwinger and meson Bethe-Salpeter equations whose interaction kernels contain gluon, pion and photon exchange interactions. In bound states, QCD-induced isospin breaking is manifest on different levels. On the one hand, a different explicit up-and down-quark mass directly affects the propagators of the constituent quarks. On the other hand, it leads to different interaction kernels within the isospin multiplets. In addition, electromagnetic isospin breaking is induced via a photon exchange diagram. Using the kaon iso-doublet and the charged pion masses as input to determine the up, down and strange quark masses we find for the pion, kaon and rho meson mass splittings different patterns each. In particular, our results provide evidence that the effects from two sources of mass splittings, the different quark masses and the different quark charges, do not add up linearly. (C) 2022 The Author(s). Published by Elsevier B.V.

Harvard Citation style: Miramontes, A., Alkofer, R., Fischer, C. and Sanchis-Alepuz, H. (2022) Electromagnetic and strong isospin breaking in light meson masses, Physics Letters B, 833, Article 137291. https://doi.org/10.1016/j.physletb.2022.137291

APA Citation style: Miramontes, A., Alkofer, R., Fischer, C., & Sanchis-Alepuz, H. (2022). Electromagnetic and strong isospin breaking in light meson masses. Physics Letters B. 833, Article 137291. https://doi.org/10.1016/j.physletb.2022.137291