Measurement of the differential branching fraction of the decay Λ[superscript 0][subscript b] → Λμ[superscript +]μ[superscript −]
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Author(s)
Williams, Michael
Date Issued
August 2013
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Aaij, R., et al. “Measurement of the differential branching fraction of the decay Λ[superscript 0][subscript b] → Λμ[superscript +]μ[superscript −].” Physics Letters B, vol. 725, no. 1–3, Aug. 2013, pp. 25–35. © 2013 CERN
Version
Final published version
Abstract
The differential branching fraction of the decay Λ[superscript 0][subscript b] →Λμ[superscript +]μ[superscript -] is measured as a function of the square of the dimuon invariant mass, q[superscript 2]. A yield of 78 ± 12 Λ[superscript 0][subscript b] → Λμ[superscript +]μ][superscript -] decays is observed using data, corresponding to an integrated luminosity of 1.0 fb [superscript -1], collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. A significant signal is found in the q[superscript 2] region above the square of the J/ψ mass, while at lower-q[superscript 2] values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q[superscript 2], while excluding the J/ψ and ψ(2S) regions, gives a branching fraction of B(Λ[superscript 0][subscript b] → Λμ[superscript +]μ[superscript -]) = (0.96 ± 0.16(stat)±0.13(syst)±0.21(norm))×10[superscript -6], where the uncertainties are statistical, systematic and due to the normalisation mode, Λ[superscript 0][subscript b] → J/ψΛ, respectively. © 2013 CERN.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Attribution 3.0 United States (CC BY 3.0 US)
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2013.06.060
