Convergence properties of eta -> 3 pi decays in chiral perturbation theory

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368865" target="_blank" >RIV/00216208:11320/17:10368865 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1140/epjc/s10052-016-4542-6" target="_blank" >http://dx.doi.org/10.1140/epjc/s10052-016-4542-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-016-4542-6" target="_blank" >10.1140/epjc/s10052-016-4542-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Convergence properties of eta -> 3 pi decays in chiral perturbation theory

Popis výsledku v původním jazyce

The convergence of the decay widths and some of the Dalitz plot parameters of the decay eta -&gt; 3 pi seems problematic in low energy QCD. In the framework of resummed chiral perturbation theory, we explore the question of compatibility of experimental data with a reasonable convergence of a carefully defined chiral series. By treating the uncertainties in the higher orders statistically, we numerically generate a large set of theoretical predictions, which are then confronted with experimental information. In the case of the decay widths, the experimental values can be reconstructed for a reasonable range of the free parameters and thus no tension is observed, in spite of what some of the traditional calculations suggest. The Dalitz plot parameters a and d can be described very well too. When the parameters b and alpha are concerned, we find a mild tension for the whole range of the free parameters, at less than 2 sigma C.L. This can be interpreted in two ways - either some of the higher order corrections are indeed unexpectedly large or there is a specific configuration of the remainders, which is, however, not completely improbable.

Název v anglickém jazyce

Convergence properties of eta -> 3 pi decays in chiral perturbation theory

Popis výsledku anglicky

The convergence of the decay widths and some of the Dalitz plot parameters of the decay eta -&gt; 3 pi seems problematic in low energy QCD. In the framework of resummed chiral perturbation theory, we explore the question of compatibility of experimental data with a reasonable convergence of a carefully defined chiral series. By treating the uncertainties in the higher orders statistically, we numerically generate a large set of theoretical predictions, which are then confronted with experimental information. In the case of the decay widths, the experimental values can be reconstructed for a reasonable range of the free parameters and thus no tension is observed, in spite of what some of the traditional calculations suggest. The Dalitz plot parameters a and d can be described very well too. When the parameters b and alpha are concerned, we find a mild tension for the whole range of the free parameters, at less than 2 sigma C.L. This can be interpreted in two ways - either some of the higher order corrections are indeed unexpectedly large or there is a specific configuration of the remainders, which is, however, not completely improbable.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/GA15-18080S" target="_blank" >GA15-18080S: Efektivní teorie pole: principy a fenomenologie</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Physical Journal C

ISSN

1434-6044

e-ISSN

—

Svazek periodika

77

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

35

Strana od-do

1-35

Kód UT WoS článku

000393665700001

EID výsledku v databázi Scopus

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