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- W4385647535 abstract "This paper reports the observation of the decays $B_{(s)}^{0}to D_{s1}(2536)^{mp}K^{pm}$ using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9,mathrm{fb}^{-1}$. The branching fractions of these decays are measured relative to the normalisation channel $B^{0}to overline{D}^{0}K^{+}K^{-}$. The $D_{s1}(2536)^{-}$ meson is reconstructed in the $overline{D}^{*}(2007)^{0}K^{-}$ decay channel and the products of branching fractions are measured to be $$mathcal{B}(B_{s}^{0}to D_{s1}(2536)^{mp}K^{pm})timesmathcal{B}(D_{s1}(2536)^{-}tooverline{D}^{*}(2007)^{0}K^{-})=(2.49pm0.11pm0.12pm0.25pm0.06)times 10^{-5}, $$ $$mathcal{B}(B^{0}to D_{s1}(2536)^{mp}K^{pm})timesmathcal{B}(D_{s1}(2536)^{-}tooverline{D}^{*}(2007)^{0}K^{-}) = (0.510pm0.021pm0.036pm0.050)times 10^{-5}.$$ The first uncertainty is statistical, the second systematic, and the third arises from the uncertainty of the branching fraction of the $B^{0}to overline{D}^{0}K^{+}K^{-}$ normalisation channel. The last uncertainty in the $B_{s}^{0}$ result is due to the limited knowledge of the fragmentation fraction ratio, $f_{s}/f_{d}$. The significance for the $B_{s}^{0}$ and $B^{0}$ signals is larger than $10,sigma$. The ratio of the helicity amplitudes which governs the angular distribution of the $D_{s1}(2536)^{-}tooverline{D}^{*}(2007)^{0}K^{-}$ decay is determined from the data. The ratio of the $S$- and $D$-wave amplitudes is found to be $1.11pm0.15pm 0.06$ and its phase $0.70pm0.09pm 0.04$ rad, where the first uncertainty is statistical and the second systematic." @default.
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