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

Abstract : The branching fraction of the rate decay $B^0 \rightarrow K^{*0}e^+e^-$ 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 $B^0 \rightarrow J/\psi(e^+e^-) K^{*0}$ is utilized as a normalization channel. The branching fraction $B^0 \rightarrow K^{*0}e^+e^-$ 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/\psi K^{*0}$ and $J/\psi \rightarrow e^+e^- $ branching fractions.
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Submitted on : Thursday, April 11, 2013 - 10:43:55 AM
Last modification on : Thursday, December 16, 2021 - 2:10:23 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Measurement of the $B^0 \rightarrow K^{*0}e^+e^-$ branching fraction at low dilepton mass. Journal of High Energy Physics, Springer, 2013, 05, pp.159. ⟨10.1007/JHEP05(2013)159⟩. ⟨in2p3-00811818⟩



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