Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0 → ρ+ρ- decays and constraint on the CKM angle φ2

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510170" target="_blank" >RIV/00216208:11320/25:10510170 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=W5GvH7cpiP" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=W5GvH7cpiP</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.111.092001" target="_blank" >10.1103/PhysRevD.111.092001</a>

Result language
angličtina
Original language name
Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0 → ρ+ρ- decays and constraint on the CKM angle φ2
Original language description
We present a measurement of the branching fraction and fraction of longitudinal polarization of B-0 -> rho(+)rho(-) decays, which have two pi(0)'s in the final state. We also measure time-dependent CP violation parameters for decays into longitudinally polarized rho(+)rho(-) pairs. This analysis is based on a data sample containing (387 +/- 6) x 10(6) (sic)(4S) mesons collected with the Belle II detector at the SuperKEKB asymmetric-energy e(+)e(-) collider in 2019-2022. We obtain B(B-0 -> rho(+)rho(-)) = (2.89(-0.22)(-0.27)(+0.23)(+0.29)) x 10(-5), f(L) = 0.921(-0.025)(-0.015)(+0.024)(+0.017), S = -0.26 +/- 0.19 +/- 0.08, and C = -0.02 +/- 0.12(-0.05)(+0.06), where the first uncertainties are statistical and the second are systematic. We use these results to perform an isospin analysis to constrain the Cabibbo-Kobayashi-Maskawa angle phi(2) and obtain two solutions; the result consistent with other Standard Model constraints is phi(2) = (92.6(-4.7)(+4.5))degrees.
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
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OECD FORD branch
10300 - Physical sciences

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)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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