Measurement of the differential branching fraction of the decay Λ0b → Λμ+ μ−
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Author
Calvo Gómez, Míriam
Camboni, Alessandro
Vilasís Cardona, Xavier
LHCb Collaboration - CERN
Other authors
Universitat Ramon Llull. La Salle
CERN
Publication date
2013-06Abstract
The differential branching fraction of the decay $\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$ is measured as a function of the square of the dimuon invariant mass, $q^2$. A yield of $78\pm12$ $\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$ 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 $J/\psi$ 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 $J/\psi$ and $\psi(2S)$ 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.
Document Type
Article
Published version
Language
English
Subject (CDU)
53 - Physics
Keywords
Gran col·lisionador d'hadrons (França i Suïssa)
Física--Mesuraments
Física nuclear--Investigació
Pages
11 p.
Publisher
Elsevier
Is part of
Physics Letters B, 2013, Vol. 725, No. 1-3 (Agost 2013)
This item appears in the following Collection(s)
Rights
© CERN
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-nd/4.0/