First Measurement of RðXτ=lÞ as an Inclusive Test of the b → cτν Anomaly

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494067" target="_blank" >RIV/00216208:11320/24:10494067 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ydsnOOi4IV" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ydsnOOi4IV</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.132.211804" target="_blank" >10.1103/PhysRevLett.132.211804</a>

Result language
angličtina
Original language name
First Measurement of RðXτ=lÞ as an Inclusive Test of the b → cτν Anomaly
Original language description
We measure the tau-to-light-lepton ratio of inclusive B-meson branching fractions RðXτ=lÞIDENTICAL TOBðB RIGHTWARDS ARROW XτνÞ=BðB RIGHTWARDS ARROW XlνÞ, where l indicates an electron or muon, and thereby test the universalityof charged-current weak interactions. We select events that have one fully reconstructed B meson and acharged lepton candidate from 189 fb-1 of electron-positron collision data collected with the Belle IIdetector. We find RðXτ=lÞ 1/4 0.228 0.016ðstatÞ 0.036ðsystÞ, in agreement with standard-modelexpectations. This is the first direct measurement of RðXτ=lÞ.
Czech name
—
Czech description
—

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/GA22-18469S" target="_blank" >GA22-18469S: Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

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

Similar results(10)