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The ratio of branching fractions of the radiative B decays B0 -> K*0 gammaand Bs0 -> phi gamma has been measured using 0.37 fb-1 of pp collisions at acentre of mass energy of sqrt(s) = 7 TeV, collected by the LHCb experiment. Thevalue obtained is BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) = 1.12 +/- 0.08^{+0.06}_{-0.04} ^{+0.09}_{-0.08}, where the first uncertainty is statistical,the second systematic and the third is associated to the ratio of fragmentationfractions fs/fd. Using the world average for BR(B0 -> K*0 gamma) = (4.33 +/-0.15) x 10^{-5}, the branching fraction BR(Bs0 -> phi gamma) is measured to be(3.9 +/- 0.5) x 10^{-5}, which is the most precise measurement to date.

Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma)