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We present a measurement of $B^{0} \rightarrow \omega \omega$, a charmlessdecay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairscollected with the Belle detector at the KEKB $e^+e^-$ collider. The decay isobserved with a significance of 7.9 standard deviations. We measure a branchingfraction $\mathcal{B} = (1.53 \pm 0.29 \pm 0.17) \times 10^{-6}$, a fraction oflongitudinal polarization $f_L = 0.87 \pm 0.13 \pm 0.13$, and a time-integrated$CP$ asymmetry $A_{CP}$ = $-0.44 \pm 0.43 \pm 0.11$, where the firstuncertainties listed are statistical and the second are systematic. This is thefirst observation of $B^{0} \rightarrow \omega \omega$, and the firstmeasurements of $f_L$ and $A_{CP}$ for this decay.

Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow \omega \omega$