# Measurement of the differential branching fraction of the decay Λ0b→Λμ+μ−

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Measurement of the differential branching fraction of the decay Λ0b→Λμ+μ−. Physics Letters B, 725(1-3):25-35.

## Abstract

The differential branching fraction of the decay Λ0b→Λμ+μ− is measured as a function of the square of the dimuon invariant mass, q2. A yield of 78±12 Λ0b→Λμ+μ− decays is observed using data, corresponding to an integrated luminosity of 1.0\,fb−1, collected by the LHCb experiment at a centre-of-mass energy of 7\,TeV. A significant signal is found in the q2 region above the square of the J/ψ mass, while at lower-q2 values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q2, while excluding the J/ψ and ψ(2S) regions, gives a branching fraction of $\BF($\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$)=(0.96\pm 0.16\stat\pm 0.13\syst\pm 0.21 (\mathrm{norm}))\times 10^{-6}$, where the uncertainties are statistical, systematic and due to the normalisation mode, $$\Lambda_b^0\rightarrow J/psi\Lambda, respectively. The differential branching fraction of the decay Λ0b→Λμ+μ− is measured as a function of the square of the dimuon invariant mass, q2. A yield of 78±12 Λ0b→Λμ+μ− decays is observed using data, corresponding to an integrated luminosity of 1.0\,fb−1, collected by the LHCb experiment at a centre-of-mass energy of 7\,TeV. A significant signal is found in the q2 region above the square of the J/ψ mass, while at lower-q2 values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q2, while excluding the J/ψ and ψ(2S) regions, gives a branching fraction of \BF(\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-)=(0.96\pm 0.16\stat\pm 0.13\syst\pm 0.21 (\mathrm{norm}))\times 10^{-6}, where the uncertainties are statistical, systematic and due to the normalisation mode,$$\Lambda_b^0\rightarrow J/psi\Lambda\$, respectively.

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19 citations in Web of Science®
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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2013 20 Feb 2014 14:16 05 Apr 2016 17:35 Elsevier 0370-2693 https://doi.org/10.1016/j.physletb.2013.06.060
Permanent URL: https://doi.org/10.5167/uzh-91688