Listando La Salle por materia "Col·lisions (Física nuclear)"
Mostrando ítems 61-80 de 219
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Measurement of CP Violation in B0→J/ψK0S Decays
(Physical Review Letters, 2015, Vol. 115, No. 3 (Juliol), 2015-07-14)Measurements are presented of the CP violation observables S and C in the decays of B0 and ¯B0 mesons to the J/ψK0S final state. The data sample corresponds to an integrated luminosity of 3.0 fb−1 ... -
Measurement of CP violation parameters and polarisation fractions in B0s→J/ψK¯¯¯¯∗0 decays
(Journal of High Energy Physics, 2015, Vol. 2015, No.11 (Novembre), 2015-11-12)The first measurement of CP asymmetries in the decay B0s→J/ψK¯¯¯¯∗(892)0 and an updated measurement of its branching fraction and polarisation fractions are presented. The results are obtained using ... -
Measurement of CP violation parameters in B0 → DK*0 decays
(Physical Review D, 2014, Vol. 90 , No. 11 (Desembre), 2014-12-02)An analysis of B0→DK*0 decays is presented, where D represents an admixture of D0 and ¯D0 mesons reconstructed in four separate final states: K−π+, π−K+, K+K− and π+π−. The data sample corresponds to ... -
Measurement of D0–¯¯¯D0 Mixing Parameters and Search for CP Violation Using D0→K+π− Decays
(Physical Review Letters, 2013, Vol. 111, No. 25 (Desembre), 2013-12-18)Measurements of charm mixing parameters from the decay-time-dependent ratio of D0→K+π− to D0→K−π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb−1 of ... -
Measurement of forward J/ψ production cross-sections in pp collisions at s√=13 TeV
(Journal of High Energy Physics, 2015, Vol. 2015, No.10 (Octubre), 2015-10-26)The production of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of s√=13 TeV is studied with the LHCb detector. Cross-section measurements are performed as a function of the transverse ... -
Measurement of forward Z → e+e− production at s√=8 TeV
(Journal of High Energy Physics, 2015, Vol. 2015, No.109 (Maig), 2015-05-21)A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8 TeV centre-of-mass energy is presented. The measurement is based on a sample of Z → e+e− decays ... -
Measurement of fs/fu Variation with Proton-Proton Collision Energy and B-Meson Kinematics
(Physical Review Letters, 2020, Vol.124, 122002, 2020-03)The ratio of the B0s and B+ fragmentation fractions fs and fu is studied with B0s→J/ψϕ and B+→J/ψK+ decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV ... -
Measurement of J/ψ production in pp collisions at s√=2.76TeV
(Journal of High Energy Physics, 2013, Vol. 2013, No.2 (Febrer), 2013-02-07)The production of J/ψ mesons is studied with the LHCb detector using data from pp collisions at s√=2.76 TeV corresponding to an integrated luminosity of 71 nb−1. The differential cross-section for ... -
Measurement of J/Ψ production in pp collisions at s√=7 TeV
(The European Physical Journal C, 2011. Vol. 71, No. 5 (Maig), 2011-05-19)The production of J/ψ mesons in proton–proton collisions at s√=7\ensuremath TeV is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/ψ production is measured as a ... -
Measurement of polarization amplitudes and CP asymmetries in B 0 → ϕK *(892)0
(Journal of High Energy Physics, 2014, Vol. 2014, No.5 (Maig), 2014-05-16)An angular analysis of the decay B 0 → ϕK *(892)0 is reported based on a pp collision data sample, corresponding to an integrated luminosity of 1.0 fb−1, collected at a centre-of-mass energy of s√ = 7 ... -
Measurement of prompt hadron production ratios in pp collisions at s√=0.9 and 7 TeV
(The European Physical Journal C, 2012, Vol. 72, no. 8 (Agost), 2012-08-16)All underlying interactions responsible for pp collisions at the Large Hadron Collider (LHC) and the subsequent hadronisation process can be understood within the context of quantum chromodynamics (QCD). ... -
Measurement of relative branching fractions of B decays to ψ(2S) and J/ψ mesons
(The European Physical Journal C, 2012, Vol. 72, No. 2118, 2012-08)The relative rates of B-meson decays into J/ψ and ψ(2S) mesons are measured for the three decay modes in pp collisions recorded with the LHCb detector. The ratios of branching fractions (B) are measured ... -
Measurement of resonant and CP components in ¯B0s→J/ψπ+π− decays
(Physical Review D, 2014, Vol. 89 , No.9 (Maig), 2014-05-14)Structure of the decay ¯B0s→J/ψπ+π− is studied using data corresponding to 3 fb−1 of integrated luminosity from pp collisions produced by the LHC and collected by the LHCb detector. Five interfering ... -
Measurement of the B 0 s → μ + μ − Branching Fraction and Search for B 0 → μ + μ − Decays at the LHCb Experiment
(Physical Review Letters, 2013, Vol. 111, No. 10, 2013-09)A search for the rare decays B 0 s → μ + μ − and B 0 → μ + μ − is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1 fb − 1 of p p collisions at ... -
Measurement of the C P Asymmetry in B + → K + μ + μ − Decays
(Physical Review Letters, 2013, Vol. 111, No. 15, 2013-10)A measurement of the CP asymmetry in Bþ ! Kþ þ decays is presented using pp collision data, corresponding to an integrated luminosity of 1:0 fb 1, recorded by the LHCb experiment during 2011 at ... -
Measurement of the ¯¯¯ B 0 s Effective Lifetime in the J / ψ f 0 ( 980 ) Final State
(Physical Review Letters, 2012, Vol. 109, No. 15, 2012-10)The effective lifetime of the ¯¯¯ B 0 s meson in the decay mode ¯¯¯ B 0 s → J / ψ f 0 ( 980 ) is measured using 1.0 fb − 1 of data collected in p p collisions at √ s = 7 TeV with the ... -
Measurement of the B 0 s → ϕϕ branching fraction and search for the decay B 0 → ϕϕ
(Journal of High Energy Physics, 2015, Vol. 2015, No.8 (Octubre), 2015-10-08)Using a dataset corresponding to an integrated luminosity of 3.0 fb−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the B 0 s → ϕϕ branching fraction is measured to be B(B0s→ϕ ... -
Measurement of the B+c meson lifetime using B+c→J/ψμ+νμX decays
(The European Physical Journal C, 2014, Vol. 74, no. 5 (Maig), 2014-05-01)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 luminosity of 2 fb −1, are collected by the ... -
Measurement of the B0–B0 oscillation frequency md with the decays B0→D−π+ and B0→J/ψK∗0
(Physical Letters B, Vol. 719, 2013-01)The B0–B0oscillation frequency mdis measured by the LHCb experiment using a dataset correspondingto an integrated luminosity of 1.0fb−1of proton–proton collisions at√s=7TeV,and is found to be ... -
Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s → D_s^-(3) π decays
(Physics Letters B , 2012, Vol. 709, No. 3 (Març), 2012-03-19)The B^0_s-\bar{B}^0_s oscillation frequency Delta m_s is measured with 36 pb^{-1} of data collected in pp collisions at \sqrt{s} = 7 TeV by the LHCb experiment at the Large Hadron Collider. A total of ...