Measurement of the differential branching fraction of the decay Λb0→Λμ+μ-
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Volume
725
Journal Issue
1月3日
Pages
25-35
Date Issued
2013
Author(s)
Aaij, R. et al. (LHCb Collaboration)
Abstract
The differential branching fraction of the decay 0 b + -is measured as a function of the square of the dimuon invariant mass, q 2 . A yield of 78 12 0 b + -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 q 2 region above the square of the J / mass, while at lower-q 2 values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q 2 , while excluding the J / and (2S) regions, gives a branching fraction of B( 0 b + -) = (0.96 0.16(stat) 0.13(syst) 0.21(norm)) 10 -6 , where the uncertainties are statistical, systematic and due to the normalisation mode, 0 b J /, respectively.
Type
journal article