Gómez Nicola, A.; Ruiz de Elvira, J.; Vioque-Rodríguez, A.; Álvarez-Herrero, D. (2021). The role of strangeness in chiral and U(1)_A restoration. The European physical journal. C, Particles and fields, 81(7), p. 637. Springer 10.1140/epjc/s10052-021-09458-1
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We use recently derived Ward identities and lattice
data for the light- and strange-quark condensates to
reconstruct the scalar and pseudoscalar susceptibilities (χκ
S ,
χK
P ) in the isospin 1/2 channel. We show that χκ
S develops
a maximum above the QCD chiral transition, after which it
degenerates with χK
P . We also obtain χκ
S within Unitarized
Chiral Perturbation Theory (UChPT) at finite temperature,
when it is saturated with the K∗
0 (700) (or κ) meson, the
dominant lowest-energy state in the isospin 1/2 scalar channel
of πK scattering. Such UChPT result reproduces the
expected peak structure, revealing the importance of thermal
interactions, and makes it possible to examine the χκ
S dependence
on the light- and strange-quark masses. A consistent
picture emerges controlled by the ml/ms ratio that allows
one studying K − κ degeneration in the chiral, two-flavor
and SU(3) limits. These results provide an alternative sign
for O(4) × U(1)A restoration that can be explored in lattice
simulations and highlight the role of strangeness, which
regulated by the strange-quark condensate helps to reconcile
the current tension among lattice results regarding U(1)A
restoration.
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: |
1434-6044 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Esther Fiechter |
Date Deposited: |
29 Dec 2021 13:49 |
Last Modified: |
05 Dec 2022 15:55 |
Publisher DOI: |
10.1140/epjc/s10052-021-09458-1 |
ArXiv ID: |
2012.12279 |
BORIS DOI: |
10.48350/161971 |
URI: |
https://boris.unibe.ch/id/eprint/161971 |
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