Browsing Recerca by Subject "539"
Now showing items 121-140 of 236
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Measurement of the ratio of branching fractions B(B0 → K∗0γ )/B(B0 s → φγ ) and the direct CP asymmetry in B0 → K∗0γ
(Nuclear Physics B, 2012, Vol. 867, 2012-09)The ratio of branching fractions of the radiative B decays B0→K∗0γ andB0s→φγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a ... -
Measurement of the ratio of branching fractions B(Bd→K∗0γ)/B(Bs→ϕγ) with the LHCb experiment at s√=7~TeV
(2011-08)The ratio of branching ratios of the radiative B decays Bd→K∗0γ and Bs→ϕγ has been measured using 340.1~pb−1 of \emph{pp} collisions at a centre of mass energy of s√=7~TeV taken with the LHCb detector. ... -
Measurement of the ratio of prompt χc to J/ψ production in pp collisions at √s=7TeV
(Physics Letters B , 2012, Vol. 718, No. 2 (Desembre), 2012-12-05)The prompt production of charmoniumχcandJ/ψstates is studied in proton–proton collisionsat a centre-of-mass energy of√s=7 TeV at the Large Hadron Collider. TheχcandJ/ψmesonsare identified through their ... -
Measurement of the relative rate of prompt χ c0, χ c1 and χ c2 production at s√=7 TeV
(Journal of High Energy Physics, 2013, Vol. 2013, No.10 (Octubre), 2013-10-18)Prompt production of charmonium χ c0, χ c1 and χ c2 mesons is studied using proton-proton collisions at the LHC at a centre-of-mass energy of s√=7 TeV. The χ c mesons are identified through their decay ... -
Measurement of the resonant and CP components in ¯B0 → J/ψπ+π− decays
(Physical Review D, 2014, Vol. 90 , No.1 (Juliol), 2014-07-10)The resonant structure of the reaction ¯B0→J/ψπ+π− is studied using data from 3 fb−1 of integrated luminosity collected by the LHCb experiment, one third at 7 TeV center-of-mass energy and the remainder ... -
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-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 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 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 |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 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, ... -
Measurement of ψ(2S) production cross-sections in proton-proton collisions at s√=7 and 13 TeV
(The European Phisical Journal C, 2020, 185, 2020-02)The cross-sections of ψ(2S) meson production in proton-proton collisions at s√=13 TeV are measured with a data sample collected by the LHCb detector corresponding to an integrated luminosity of 275 pb−1. ... -
Measurement of ϒ production in pp collisions at s−−√=7 TeV
(The European Physical Journal C, 2012. Vol. 72, No. 6 (Juny), 2012-06-07)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 ... -
Measurement of ϒ production in pp collisions at √ s = 2.76 TeV
(The European Physical Journal C, 2014, Vol. 74, no. 4 (Abril), 2014-04-29)The production of Υ(1S), Υ(2S) and Υ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3pb−1 collected ...