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

Result code in 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>
Alternative codes found
RIV/68378271:_____/24:00605496 RIV/61989592:15310/24:73628627
Result on the web
<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>

Result language
angličtina
Original language name
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
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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