Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at √s = 13 TeV with the ATLAS detector

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494382" target="_blank" >RIV/00216208:11320/24:10494382 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/24:00605496 RIV/61989592:15310/24:73628627

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ehPRNVFHp1" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ehPRNVFHp1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-024-13070-4" target="_blank" >10.1140/epjc/s10052-024-13070-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at √s = 13 TeV with the ATLAS detector

Popis výsledku v původním jazyce

The ratio of branching ratios of the W boson to muons and electrons, R μ/e W = B(W RIGHTWARDS ARROW μν)/B(W RIGHTWARDS ARROW eν), has been measured using 140 fb-1 of pp collision data at SQUARE ROOTs = 13TeV c ollected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the t -t production crosssection in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio R μμ/ee Z for the Z boson measured in inclusive Z RIGHTWARDS ARROW ee and Z RIGHTWARDS ARROW μμ events. By using the precise value of R μμ/ee Z determined from e+e- colliders, the ratio R μ/e W is determined to be R μ/e W= 0.9995 +- 0.0022 (stat) +- 0.0036 (syst)+- 0.0014 (ext).The three uncertainties correspond to data statistics, experimental systematics and the external measurement of R μμ/ee Z , giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W boson decays at the 0.5% level.

Název v anglickém jazyce

Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at √s = 13 TeV with the ATLAS detector

Popis výsledku anglicky

The ratio of branching ratios of the W boson to muons and electrons, R μ/e W = B(W RIGHTWARDS ARROW μν)/B(W RIGHTWARDS ARROW eν), has been measured using 140 fb-1 of pp collision data at SQUARE ROOTs = 13TeV c ollected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the t -t production crosssection in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio R μμ/ee Z for the Z boson measured in inclusive Z RIGHTWARDS ARROW ee and Z RIGHTWARDS ARROW μμ events. By using the precise value of R μμ/ee Z determined from e+e- colliders, the ratio R μ/e W is determined to be R μ/e W= 0.9995 +- 0.0022 (stat) +- 0.0036 (syst)+- 0.0014 (ext).The three uncertainties correspond to data statistics, experimental systematics and the external measurement of R μμ/ee Z , giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W boson decays at the 0.5% level.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

<a href="/cs/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Výzkum základních stavebních kamenů hmoty s využitím špičkových technologií</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

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

1434-6052

Svazek periodika

84

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

33

Strana od-do

993

Kód UT WoS článku

001394631200001

EID výsledku v databázi Scopus

2-s2.0-85206098232