Observation of time-dependent CP violation and measurement of the branching fraction of B0 → J/ψπ0 decays
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510096" target="_blank" >RIV/00216208:11320/25:10510096 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=soHcEX-1ib" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=soHcEX-1ib</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.111.012011" target="_blank" >10.1103/PhysRevD.111.012011</a>
Alternative languages
Result language
angličtina
Original language name
Observation of time-dependent CP violation and measurement of the branching fraction of B0 → J/ψπ0 decays
Original language description
We present a measurement of the branching fraction and time-dependent charge-parity (CP) decay-rate asymmetries in B-0 -> J/psi pi(0) decays. The data sample was collected with the Belle II detector at the SuperKEKB asymmetric e(+)e(-) collider in 2019-2022 and contains (387 +/- 6) x 10(6) B (B) over bar meson pairs from Upsilon(4S) decays. We reconstruct 392 +/- 24 signal decays and fit the CP parameters from the distribution of the proper-decay-time difference of the two B mesons. We measure the branching fraction to be (B-0 -> J/psi pi(0)) = (2.00 +/- 0.12 +/- 0.09) x 10(-5) and the direct and mixing-induced CP asymmetries to be C-CP = 0.13 +/- 0.12 +/- 0.03 and S-CP = -0.88 +/- 0.17 +/- 0.03, respectively, where the first uncertainties are statistical and the second are systematic. We observe mixing-induced CP violation with a significance of 5.0 standard deviations for the first time in this mode.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
111
Issue of the periodical within the volume
01
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
012001
UT code for WoS article
001443905400001
EID of the result in the Scopus database
2-s2.0-85216412843