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Within the factorization-assisted topological-amplitude approach, we studiedthe 33 charmless $B_{(s)} \to VV$ decays, where $V$ stands for a light vectormeson. According to the flavor flows, the amplitude of each process can bedecomposed into 8 different topologies. In contrast to the conventional flavordiagrammatic approach, we further factorize each topological amplitude intodecay constant, form factors and unknown universal parameters. By $\chi^2$fitting 46 experimental observables, we extracted 10 theoretical parameterswith $\chi^2$ per degree of freedom around 2. Using the fitted parameters, wecalculated the branching fractions, polarization fractions, CP asymmetries andrelative phases between polarization amplitudes of each decay mode. The decaychannels dominated by tree diagram have large branching fractions and largelongitudinal polarization fraction. The branching fractions and longitudinalpolarization fractions of color-suppressed decays become smaller. Currentexperimental data of large transverse polarization fractions in the penguindominant decay channels can be explained by only one transverse amplitude ofpenguin annihilation diagram. Our predictions of those not yet measuredchannels can be tested in the ongoing LHCb experiment and the Belle-IIexperiment in future.

Charmless $B_{(s)}\to VV$ Decays in Factorization-Assisted Topological-Amplitude Approach