Measurement of the $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ branching fraction at low dilepton mass

Abstract

The branching fraction of the rate decay $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ in the dilepton mass region from 30 to 1000 MeV$/c^2$ has been measured by the LHCb experiment, using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$, at a centre-of-mass energy of 7 TeV. The decay mode $B^0\to J/\psi (e^{+}{e}^{-})K^{\ast 0}$ is utilized as a normalization channel. The branching fraction $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ is measured to be $$ B(B^0 \rightarrow K^{*0}e^+e^-)^{30-1000 MeV/c^2}= (3.1\, ^{+0.9\mbox{} +0.2}_{-0.8\mbox{}-0.3} \pm 0.2)\times 10^{-7}, $$ where the first error is statistical, the second is systematic, and the third comes from the uncertainties on the B^0 \rightarrow J/ψK^{*0}$and$J/ψ\rightarrow e^+e^- $ branching fractions.

13 pages, 4 figures

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