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J

J. Lefrançois

Researcher at University of Paris-Sud

Publications -  732
Citations -  34781

J. Lefrançois is an academic researcher from University of Paris-Sud. The author has contributed to research in topics: Branching fraction & Meson. The author has an hindex of 84, co-authored 732 publications receiving 32013 citations. Previous affiliations of J. Lefrançois include Centre national de la recherche scientifique.

Papers
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Test of lepton universality using b^{+}k^{+}ℓ^{+}ℓ^{-} decays

Roel Aaij, +701 more
TL;DR: The value of the ratio of branching fractions for the dilepton invariant mass squared range 1 < q(2) < 6 GeV(2)/c(4) is measured to be 0.745(-0.074)(+0.090)(stat) ± 0.036(syst).
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LHCb Detector Performance

Roel Aaij, +703 more
TL;DR: In this article, the performance of the various LHCb sub-detectors and the trigger system are described, using data taken from 2010 to 2012, and it is shown that the design criteria of the experiment have been met.
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Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays

Roel Aaij, +722 more
TL;DR: In this article, the pentaquark-charmonium states were observed in the J/ψp channel in Λ0b→J/K−p decays and the significance of these resonances is more than 9 standard deviations.
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Electroweak measurements in electron positron collisions at W-boson-pair energies at LEP

S. Schael, +1675 more
- 30 Nov 2013 - 
TL;DR: In this paper, the results of the four LEP experiments were combined to determine fundamental properties of the W boson and the electroweak theory, including the branching fraction of W and the trilinear gauge-boson self-couplings.
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Observation of the rare B-s(0)->mu(+)mu(-) decay from the combined analysis of CMS and LHCb data

Vardan Khachatryan, +2805 more
- 04 Jun 2015 - 
TL;DR: In this paper, the branching fractions of the B meson (B-s(0)) and the B-0 meson decaying into two oppositely charged muons (mu(+) and mu(-)) were observed.