Constraints on low energy QCD parameters from eta -> 3 pi and pi pi scattering
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10386699" target="_blank" >RIV/00216208:11320/18:10386699 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-018-5668-5" target="_blank" >https://doi.org/10.1140/epjc/s10052-018-5668-5</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-018-5668-5" target="_blank" >10.1140/epjc/s10052-018-5668-5</a>
Alternative languages
Result language
angličtina
Original language name
Constraints on low energy QCD parameters from eta -> 3 pi and pi pi scattering
Original language description
The eta -> 3 pi decays are a valuable source of information on low energy QCD. Yet they were not used for an extraction of the three flavor chiral symmetry breaking order parameters until now. We use a Bayesian approach in the framework of resummed chiral perturbation theory to obtain constraints on the quark condensate and pseudoscalar decay constant in the chiral limit. We compare our results with recent CHPT and lattice QCD fits and find some tension, as the eta -> 3 pi data seem to prefer a larger ratio of the chiral order parameters. The results also disfavor a very large value of the pseudoscalar decay constant in the chiral limit, which was found by some recent work. In addition, we present results of a combined analysis including eta -> 3 pi decays and pi pi scattering and though the picture does not changed appreciably, we find some tension between the data we use. We also try to extract information on the mass difference of the light quarks, but the uncertainties prove to be large.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/GA15-18080S" target="_blank" >GA15-18080S: Effective field theories: principles and phenomenology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
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Volume of the periodical
78
Issue of the periodical within the volume
3
Country of publishing house
DE - GERMANY
Number of pages
14
Pages from-to
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UT code for WoS article
000428581500001
EID of the result in the Scopus database
2-s2.0-85044502123