Measurements of the Branching Fraction, Polarization, and CP Asymmetry for the Decay B0 →ωω
Journal
Physical Review Letters
Journal Volume
133
Journal Issue
8
Start Page
081801
ISSN
0031-9007
1079-7114
Date Issued
2024-08-22
Author(s)
Abstract
We present a comprehensive study of B0→ωω decays using 772×106 BB¯ pairs collected with the Belle detector at the KEKB e+e- collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and CP violation. The decay is observed for the first time with a significance of 7.9 standard deviations. We measure a branching fraction B=(1.53±0.29±0.17)×10-6, a fraction of longitudinal polarization fL=0.87±0.13±0.13, and a time-integrated CP asymmetry ACP=-0.44±0.43±0.11, where the first uncertainties listed are statistical and the second are systematic. This is the first observation of B0→ωω and the first measurements of fL and ACP for this decay.
Publisher
American Physical Society (APS)
Type
journal article