Abstract
The ratio of branching fractions of the radiative B decays B0→K⁎0γ and Bs0→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s=7 TeV. The value obtained isB(B0→K⁎0γ)B(Bs0→ϕγ)=1.23±0.06 (stat.)±0.04 (syst.)±0.10(fs/fd), where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(Bs0→ϕγ) is measured to be (3.5±0.4)×10−5.The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to beACP(B0→K⁎0γ)=(0.8±1.7 (stat.)±0.9 (syst.))%.Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations.
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