Measurement of the differential branching fraction of the decay Λ[superscript 0][subscript b] → Λμ[superscript +]μ[superscript −]
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 ob...
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| Format: | Article |
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Elsevier BV
2018
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| Online Access: | http://hdl.handle.net/1721.1/116321 https://orcid.org/0000-0001-8285-3346 |
| Summary: | 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. |
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