Browsing Recerca by Title
Now showing items 1657-1676 of 2716
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Measurement of the Semileptonic C P Asymmetry in B0 - ̄B0 Mixing
(Physical Review Letters , 2015, Vol. 114, No. 4 (Gener), 2015-01-28)The semileptonic CP asymmetry in B0-¯B0 mixing, adsl, is measured in proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment. Semileptonic ... -
Measurement of the time-dependent CP asymmetries in B 0s → J/ψK 0S
(Journal of High Energy Physics, 2015, Vol. 2015, No.6 (Juny), 2015-06-18) -
Measurement of the time-dependent CP asymmetry in B0 → J/ψ K0S decays
(Physics Letters B, Vol. 721, No. 1-3 (Abril 2013), 2013-04-10)This Letter reports a measurement of the CP violation observables S J/ψK0S and C J/ψK0S in the decay channel B0 → J/ψ K0S performed with 1.0 fb-1 of pp collisions at √s = 7 TeV collected by the LHCb ... -
Measurement of the time-integrated CP asymmetry in D 0 → K 0S K 0S decays
(Journal of High Energy Physics, 2015, Vol. 2015, No.10 (Octubre), 2015-10-08)The time-integrated CP asymmetry in the decay D 0 → K 0S K 0S is measured using 3 fb−1 of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ... -
Measurement of the track reconstruction efficiency at LHCb
(Journal of Instrumentation, 2015, Vol. 10, No. 7, 2015-02)The determination of track reconstruction efficiencies at LHCb using J/ψ→μ+μ- decays is presented. Efficiencies above 95% are found for the data taking periods in 2010, 2011, and 2012. The ratio of the ... -
Measurement of the Z+b-jet cross-section in pp collisions at s√ = 7 TeV in the forward region
(Journal of High Energy Physics, 2015, Vol. 2015, No.1 (Gener), 2015-01-13)The associated production of a Z boson or an off-shell photon γ * with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7 TeV. The Z bosons ... -
Measurement of the ¯B0s Meson Lifetime in D+sπ− Decays
(Physical Review Letters, 2014, Vol. 113, No. 17 (Octubre), 2014-10-24)We present a measurement of the ratio of the ¯B0s meson lifetime, in the flavor-specific decay to D+sπ−, to that of the ¯B0 meson. The pp collision data used correspond to an integrated luminosity of ... -
Measurement of the ¯B0s→D−sD+s and ¯B0s→D−D+s Effective Lifetimes
(Physical Review Letters, 2014, Vol. 112, No. 11 (Març), 2014-03-19)The first measurement of the effective lifetime of the ¯B0s meson in the decay ¯B0s→D−sD+s is reported using a proton-proton collision data set, corresponding to an integrated luminosity of 3 fb−1, ... -
Measurement of the ηc(1S) production cross-section in p p collisions at s√=13 TeV
(The European Phisical Journal C, 2020, 191, 2020-03)Using a data sample corresponding to an integrated luminosity of 2.0 fb−1, collected by the LHCb experiment, the production of the ηc(1S) state in proton–proton collisions at a centre-of-mass energy of ... -
Measurement of the ηc(1S) production cross-section in proton–proton collisions via the decay ηc(1S)→pp¯¯¯
(The European Physical Journal C, 2015, Vol. 75, no. 7 (Juliol), 2015-07-04)High centre-of-mass energies available in proton-proton collisions at the LHC allow models describing charmonium production to be tested. We distinguish promptly produced charmonia from those originating ... -
Measurement of the Λ0b → J/ψΛ angular distribution angular distribution and the Λ0b polarisation in pp collisions
(Journal of High Energy Physics, 2020, 110, 2020-06-17)This paper presents an analysis of the Λ0b→ J/ψΛ angular distribution and the transverse production polarisation of Λ0b baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. ... -
Measurement of the Λ0b, Ξ−b, and Ω−b Baryon Masses
(Physical Review Letters, 2013, Vol. 110, No. 18 (Maig), 2013-05-02)Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb−1 of data collected in 2011 with the LHCb detector. Significant Λ0b→J/ψΛ, Ξ−b→J/ψΞ− and Ω−b→J/ψΩ− signals are observed ... -
Measurement of the Ξ−b and Ω−b baryon lifetimes
(Physics Letters B , 2014, Vol. 736, (Setembre), 2014-09-07)Using a data sample of pp collisions corresponding to an integrated luminosity of 3 fb−1, the Ξ−b and Ω−b baryons are reconstructed in the Ξ−b→J/ψΞ− and Ω−b→J/ψΩ− decay modes and their lifetimes measured ... -
Measurement of the χ b (3P) mass and of the relative rate of χ b1(1P) and χ b2(1P) production
(Journal of High Energy Physics, 2014, Vol. 2014, No.10 (Octubre), 2014-10-14)The production of χ b mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of s√ =7 and 8 TeV and corresponding to an integrated ... -
Measurement of theB± production cross-section in pp collisions at √s= 7TeV
(Journal of High Energy Physics, 2012, Vol. 2012, No.4 (Abril), 2012-04-19)The production of B ± mesons in proton-proton collisions at s√ = 7 TeV is studied using 35 pb−1 of data collected by the LHCb detector. The B ± mesons are reconstructed exclusively in the B ± → J/ψK ± ... -
Measurement of V 0 production ratios in pp collisions at ps = 0.9 and 7TeV
(Journal of High Energy Physics, 2011, Vol. 2011, No.8 (Agost), 2011-08-08)The Λ¯/Λ and Λ¯/K0S production ratios are measured by the LHCb detector from 0.3 nb−1 of pp collisions delivered by the LHC at s√=0.9 TeV and 1.8 nb−1 at s√=7 TeV. Both ratios are presented as a function ... -
Measurement of |Vcb| with Bs → Ds(*) −μ +νμ decays
(Physical Review D, 2020, Vol. 101, n.7 (Abril), 2020-03)The element |Vcb| of the Cabibbo-Kobayashi-Maskawa matrix is measured using semileptonic B0s decays produced in proton-proton collision data collected with the LHCb detector at center-of-mass energies ... -
Measurement of σ(pp → bb X) at √s = 7 TeV in the forward region
(Physics Letters B , 2010, Vol. 694, No. 3 (Novembre), 2010-11-08)Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the bb production cross-section in proton–proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In ... -
Measurement of ψ(2S) meson production in pp collisions at s√=7 TeV
(The European Physical Journal C, 2012, Vol. 72, No. 2100, 2012-08)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 ... -
Measurement of ψ(2S) polarisation in pp collisions at s√ = 7 TeV
(The European Physical Journal C, 2014, Vol. 74, no. 5 (Maig), 2014-05-20)The polarisation of prompt ψ(2S) mesons is measured by performing an angular analysis of ψ(2S)→μ+μ− decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb −1, ...