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Mostrando ítems 2308-2327 de 3754
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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, ... -
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 ... -
Measurements of Bþ c Production and Mass with the Bþ c ! J=c þ Decay
(Physical Review Letters, 2012, Vol. 109, No. 23 (Desembre), 2012-12-05)Measurements of B+c production and mass are performed with the decay mode B+c→J/ψπ+ using 0.37 fb−1 of data collected in pp collisions at √s=7 TeV by the LHCb experiment. The ratio of the production ... -
Measurements of CP violation in the three-body phase space of charmless B± decays
(Physical Review D, 2014, Vol. 90 , No. 11 (Desembre), 2014-12-11)The charmless three-body decay modes B± → K± π+π−, B± → K± K+ K−, B± → π± K+ K− and B± → π± π+ π− are reconstructed using data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the ... -
Measurements of the B +, B 0, B0s meson and Λ0b baryon lifetimes
(Journal of High Energy Physics, 2014, Vol. 2014, No.a (Abril), 2014-04-16)Measurements of b-hadron lifetimes are reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb detector at a centre-of-mass energy of 7 TeV. Using ... -
Measurements of the branching fractions and CP asymmetries of B± → J/ψ π± and B± → ψ(2S) π± decays
(Physical Review D, 2012, Vol. 85 , No.9 (Maig), 2012-05-07)A study of B±→J/ψπ± and B±→ψ(2S)π± decays is performed with data corresponding to 0.37 fb−1 of proton-proton collisions at √s=7 TeV. Their branching fractions are found to be B(B±→J/ψπ±)=(3.88±0.11± ... -
Measurements of the branching fractions of B+ → ppK¯ + decays
(The European Physical Journal C, 2013, Vol. 73, No. 2462, 2013-06)The branching fractions of the decay B+ → ppK¯ + for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment. The ... -
Measurements of the branching fractions of the decays B0s→D∓sK± and B0s→D−sπ+
(Journal of High Energy Physics, 2012, Vol. 2012, No.6 (Juny), 2012-06-20)The decay mode B0s→D∓sK± allows for one of the theoretically cleanest measurements of the CKM angle γ through the study of time-dependent CP violation. This paper reports a measurement of its branching ...