Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F19%3A50016098" target="_blank" >RIV/62690094:18470/19:50016098 - isvavai.cz</a>
Výsledek na webu
<a href="https://link.springer.com/content/pdf/10.1007%2FJHEP08%282019%29113.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007%2FJHEP08%282019%29113.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP08(2019)113" target="_blank" >10.1007/JHEP08(2019)113</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy
Popis výsledku v původním jazyce
We present Standard Model predictions for the complete set of phenomenologically relevant electroweak precision pseudo-observables related to the Z-boson: the leptonic and bottom-quark effective weak mixing angles sin(2)theta(l)(eff), sin(2)theta(b)(eff), the Z-boson partial decay widths Gamma(f), where f indicates any charged lepton, neutrino and quark flavor (except for the top quark), as well as the total Z decay width Gamma(Z), the branching ratios R-l, R-c, R-b, and the hadronic cross section sigma(0)(had). The input parameters are the masses M-Z, M-H and m(t), and the couplings alpha(s), alpha. The scheme dependence due to the choice of M-W or its alternative G(mu) as a last input parameter is also discussed. Recent substantial technical progress in the calculation of Minkowskian massive higher-order Feynman integrals allows the calculation of the complete electroweak two-loop radiative corrections to all the observables mentioned. QCD contributions are included appropriately. Results are provided in terms of simple and convenient parameterization formulae whose coefficients have been determined from the full numerical multi-loop calculation. The size of the missing electroweak three-loop or QCD higher-order corrections is estimated. We briefly comment on the prospects for their calculation. Finally, direct predictions for the Z (f) over barf vector and axial-vector form-factors are given, including a discussion of separate order-by-order contributions.
Název v anglickém jazyce
Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy
Popis výsledku anglicky
We present Standard Model predictions for the complete set of phenomenologically relevant electroweak precision pseudo-observables related to the Z-boson: the leptonic and bottom-quark effective weak mixing angles sin(2)theta(l)(eff), sin(2)theta(b)(eff), the Z-boson partial decay widths Gamma(f), where f indicates any charged lepton, neutrino and quark flavor (except for the top quark), as well as the total Z decay width Gamma(Z), the branching ratios R-l, R-c, R-b, and the hadronic cross section sigma(0)(had). The input parameters are the masses M-Z, M-H and m(t), and the couplings alpha(s), alpha. The scheme dependence due to the choice of M-W or its alternative G(mu) as a last input parameter is also discussed. Recent substantial technical progress in the calculation of Minkowskian massive higher-order Feynman integrals allows the calculation of the complete electroweak two-loop radiative corrections to all the observables mentioned. QCD contributions are included appropriately. Results are provided in terms of simple and convenient parameterization formulae whose coefficients have been determined from the full numerical multi-loop calculation. The size of the missing electroweak three-loop or QCD higher-order corrections is estimated. We briefly comment on the prospects for their calculation. Finally, direct predictions for the Z (f) over barf vector and axial-vector form-factors are given, including a discussion of separate order-by-order contributions.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10303 - Particles and field physics
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
JOURNAL OF HIGH ENERGY PHYSICS
ISSN
1029-8479
e-ISSN
—
Svazek periodika
Neuveden
Číslo periodika v rámci svazku
8
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
23
Strana od-do
"Article Number: 113"
Kód UT WoS článku
000483924800001
EID výsledku v databázi Scopus
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