The QCD topological charge and its thermal dependence: the role of the η′

Nicola, A. Gómez; Ruiz de Elvira, J.; Vioque-Rodríguez, A. (2019). The QCD topological charge and its thermal dependence: the role of the η′. Journal of High Energy Physics, 2019(11) Springer 10.1007/JHEP11(2019)086

[img]
Preview
Text
Nicola2019_Article_TheQCDTopologicalChargeAndItsT.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (839kB) | Preview

We analyze the contribution of the η′(958) meson in the first two non-trivial moments of the QCD topological charge distribution, namely, the topological susceptibility and the fourth-order cumulant of the vacuum energy density. We perform our study within U(3) Chiral Perturbation Theory up to next-to-next-to-leading order in the combined chi- ral and large-Nc expansion. We also describe the temperature dependence of these two quantities and compare them with previous analyses in the literature. In particular, we discuss the validity of the thermal scaling of the topological susceptibility with the quark condensate, which is intimately connected with a Ward Identity relating both quantities. We also consider isospin breaking corrections from the vacuum misalignment at leading order in the U(3) framework.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Ruiz de Elvira Carrascal, Jacobo

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

05 Feb 2020 10:41

Last Modified:

05 Feb 2020 10:41

Publisher DOI:

10.1007/JHEP11(2019)086

ArXiv ID:

1907.11734

BORIS DOI:

10.7892/boris.139626

URI:

https://boris.unibe.ch/id/eprint/139626

Actions (login required)

Edit item Edit item
Provide Feedback