Aspects of model dependence of \(\eta '\)\(\eta \) complex treated by going beyond the isospin limit

Abstract

Exploring the extent of model dependence, we study effects of certain Ansätze for the T-dependence of the correction term in the QCD topological susceptibility. The one producing unwanted effects on results at \(T > 0\) in the \(\eta '\)-\(\eta \) complex in the usual limit of isospin symmetry, is largely cured from its peculiar behavior and brought into agreement with the other, when breaking of isospin symmetry is allowed and the realistic quark mass ratio \(m_u/m_d = 0.50\) is adopted.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data sharing not applicable – no new data generated.]

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Acknowledgements

D. Klabučar thanks for partial support to the COST Actions CA15213 THOR.

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Correspondence to Dubravko Klabučar.

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Communicated by Laura Tolos

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Horvatić, D., Kekez, D. & Klabučar, D. Aspects of model dependence of \(\eta '\)\(\eta \) complex treated by going beyond the isospin limit. Eur. Phys. J. A 56, 257 (2020). https://doi.org/10.1140/epja/s10050-020-00254-1

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