First Measurement of the B+ → π+π0π0 Branching Fraction and CP Asymmetry

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476471" target="_blank" >RIV/00216208:11320/23:10476471 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=RbVAC7CLEc" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=RbVAC7CLEc</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.130.181804" target="_blank" >10.1103/PhysRevLett.130.181804</a>

Result language
angličtina
Original language name
First Measurement of the B+ → π+π0π0 Branching Fraction and CP Asymmetry
Original language description
We study B+ -> pi(+)pi(0)pi(0) using 711 fb(-1) of data collected at the gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We measure an inclusive branching fraction of (19.0 +/- 1.5 +/- 1.4) x 10(-6) and an inclusive CP asymmetry of (9.2 +/- 6.8 +/- 0.7)%, where the first uncertainties are statistical and the second are systematic, and a B+ -> rho(770)(+)pi(0) branching fraction of (11.2 +/- 1.1 +/- 0.9(-1.6)(+0.8)) x 10(-6), where the third uncertainty is due to possible interference with B+ ->rho(1450)(+)pi(0). We present the first observation of a structure around 1 GeV/c(2) in the pi(0)pi(0) mass spectrum, with a significance of 6.4 sigma, and measure a branching fraction to be (6.9 +/- 0.9 +/- 0.6) x 10(-6). We also report a measurement of local CP asymmetry in this structure.
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
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)