Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494179" target="_blank" >RIV/00216208:11320/24:10494179 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K70datyDxx" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=K70datyDxx</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP05(2024)212" target="_blank" >10.1007/JHEP05(2024)212</a>

Result language
angličtina
Original language name
Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II
Original language description
We report results from a study of B+- RIGHTWARDS ARROW DK+- decays followed by D decaying tothe CP-even final state K+K- and CP-odd final state K0Sπ0, where D is an admixture ofD0 and -D0 states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitaritytriangleangle ϕ3. The results are based on a combined analysis of the final data set of772 x 106B-B pairs collected by the Belle experiment and a data set of 198 x 106B-B pairscollected by the Belle II experiment, both in electron-positron collisions at the Υ(4S) resonance.We measure the CP asymmetries to be ACP+ = (+12.5+-5.8+-1.4)% and ACP- = (-16.7+-5.7 +- 0.6)%, and the ratios of branching fractions to be RCP+ = 1.164 +- 0.081 +- 0.036 andRCP- = 1.151 +- 0.074 +- 0.019. The first contribution to the uncertainties is statistical, andthe second is systematic. The asymmetries ACP+ and ACP- have similar magnitudes andopposite signs; their difference corresponds to 3.5 standard deviations. From these valueswe calculate 68.3% confidence intervals of (8.5° < ϕ3 < 16.5°) or (84.5° < ϕ3 < 95.5°) or(163.3° < ϕ3 < 171.5°) and 0.321 < rB < 0.465.
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/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

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