τ hadronic spectral function moments in a nonpower QCD perturbation theory

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00540680" target="_blank" >RIV/68378271:_____/16:00540680 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.nuclphysbps.2015.10.061" target="_blank" >http://dx.doi.org/10.1016/j.nuclphysbps.2015.10.061</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.nuclphysbps.2015.10.061" target="_blank" >10.1016/j.nuclphysbps.2015.10.061</a>

Jazyk výsledku

angličtina

Název v původním jazyce

τ hadronic spectral function moments in a nonpower QCD perturbation theory

Popis výsledku v původním jazyce

The moments of the hadronic spectral functions are of interest for the extraction of the strong coupling and other QCD parameters from the hadronic decays of the τ lepton. We consider the perturbative behavior of these moments in the framework of a QCD nonpower perturbation theory, defined by the technique of series acceleration by conformal mappings, which simultaneously implements renormalization-group summation and has a tame large-order behavior. Two recently proposed models of the Adler function are employed to generate the higher order coefficients of the perturbation series and to predict the exact values of the moments, required for testing the properties of the perturbative expansions. We show that the contour-improved nonpower perturbation theories and the renormalization-group-summed nonpower perturbation theories have very good convergence properties for a large class of moments of the so-called “reference model”.n

Název v anglickém jazyce

τ hadronic spectral function moments in a nonpower QCD perturbation theory

Popis výsledku anglicky

The moments of the hadronic spectral functions are of interest for the extraction of the strong coupling and other QCD parameters from the hadronic decays of the τ lepton. We consider the perturbative behavior of these moments in the framework of a QCD nonpower perturbation theory, defined by the technique of series acceleration by conformal mappings, which simultaneously implements renormalization-group summation and has a tame large-order behavior. Two recently proposed models of the Adler function are employed to generate the higher order coefficients of the perturbation series and to predict the exact values of the moments, required for testing the properties of the perturbative expansions. We show that the contour-improved nonpower perturbation theories and the renormalization-group-summed nonpower perturbation theories have very good convergence properties for a large class of moments of the so-called “reference model”.n

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

Nuclear and Particle Physics Proceedings

ISBN

—

ISSN

2405-6014

e-ISSN

—

Počet stran výsledku

3

Strana od-do

2777-2779

Název nakladatele

Elsevier Science BV

Místo vydání

Amsterdam

Místo konání akce

Valencie

Datum konání akce

2. 7. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000390295200525