Ch. Cauet

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Measurement of ψ(2S) meson production in pp collisions at √ s = 7 TeV Abstract The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at √ s = 7 TeV has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb −1. The ψ(2S) mesons are reconstructed in the decay channels(More)
An angular analysis of the decay J /ψ → μ + μ − is performed to measure the polarization of prompt J /ψ mesons produced in pp collisions at √ s = 7 TeV. The dataset corresponds to an integrated luminosity of 0.37 fb −1 collected with the LHCb detector. The measurement is presented as a function of transverse momentum, p T , and rapid-ity, y, of the J /ψ(More)
A search is presented for long-lived particles with a mass between 25 and 50 GeV/c 2 and a lifetime between 1 and 200 ps in a sample of proton–proton collisions at a centre-of-mass energy of √ s = 7 TeV, corresponding to an integrated luminosity of 0.62 fb −1 , collected by the LHCb detector. The particles are assumed to be pair-produced by the decay of a(More)
A search is performed for heavy long-lived charged particles using 3.0 fb −1 of proton–proton collisions collected at √ s = 7 and 8 TeV with the LHCb detector. The search is mainly based on the response of the ring imaging Cherenkov detectors to distinguish the heavy, slow-moving particles from muons. No evidence is found for the production of such(More)
Measurement of the η c (1S) production cross-section in proton–proton collisions via the decay η c (1S) → pp Abstract The production of the η c (1S) state in proton-proton collisions is probed via its decay to the p p final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p T > 6.5 GeV/c. The(More)
Measurement of charged particle multiplicities and densities in pp collisions at √ s = 7 TeV in the forward region Abstract Charged particle multiplicities are studied in proton–proton collisions in the forward region at a centre-of-mass energy of √ s = 7 TeV with data collected by the LHCb detector. The forward spectrometer allows access to a kine-matic(More)
The lifetime of the B + c meson is measured using semileptonic decays having a J/ψ meson and a muon in the final state. The data, corresponding to an integrated lumi-nosity of 2 fb −1 , are collected by the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The measured lifetime is τ = 509 ± 8 ± 12 fs, where the first uncertainty is(More)
Measurement of the forward energy flow in pp collisions at √ s = 7 TeV Abstract The energy flow created in pp collisions at √ s = 7 TeV is studied within the pseudorapidity range 1.9 < η < 4.9 with data collected by the LHCb experiment. The measurements are performed for inclusive minimum-bias interactions , hard scattering processes and events with an(More)
The branching fractions of the decay B + → p ¯ pK + for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb −1 , collected by the LHCb experiment. The total branching fraction , its charmless component (M p ¯ p < 2.85 GeV/c 2) and the branching fractions via the resonant c ¯ c states η c (1S) and ψ(2S)(More)
The production of Υ (1S), Υ (2S) and Υ (3S) mesons in proton-proton collisions at the centre-of-mass energy of √ s = 7 TeV is studied with the LHCb detector. The analysis is based on a data sample of 25 pb −1 collected at the Large Hadron Collider. The Υ mesons are reconstructed in the decay mode Υ → μ + μ − and the signal yields are extracted from a fit to(More)