Visualitzant La Salle per autor/a "Vilasís Cardona, Xavier"

Ara mostrant els elements 21-40 de 320

    • Determination of the X(3872) Meson Quantum Numbers 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 22 (Maig), 2013-05-29)
      The quantum numbers of the X(3872) meson are determined to be JPC=1++ based on angular correlations in B+→X(3872)K+ decays, where X(3872)→π+π−J/ψ and J/ψ→μ+μ−. The data correspond to 1.0  fb−1 of pp ...

    • Determination of γ and −2βs from charmless two-body decays of beauty mesons 

      Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2015, Vol. 741 (Febrer), 2015-02-04)
      Using the latest LHCb measurements of time-dependent CP violation in the B-s(0) -> K+K- decay, a U-spin relation between the decay amplitudes of B-s(0) -> K+K- and B-0 -> p(+)p(-) decay processes allows ...

    • Differential branching fraction and angular analysis of the B+ → K+ μ+ μ− decay 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.2 (Febrer), 2013-02-19)
      The angular distribution and differential branching fraction of the decay B +→ K + μ + μ − are studied with a dataset corresponding to 1.0fb−1 of integrated luminosity, collected by the LHCb experiment. ...

    • Differential branching fraction and angular analysis of the decay B 0 → K ∗0 μ + μ − 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.8 (Agost), 2013-08-29)
      The angular distribution and differential branching fraction of the decay B 0→ K ∗0 μ + μ − are studied using a data sample, collected by the LHCb experiment in pp collisions at s√=7 TeV, corresponding ...

    • Differential Branching Fraction and Angular Analysis of the Decay B0 → K*0 μ+ μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 18 (Maig), 2012-05-03)
      The angular distributions and the partial branching fraction of the decay B0→K*0μ+μ− are studied by using an integrated luminosity of 0.37  fb−1 of data collected with the LHCb detector. The forward-backward ...

    • Differential branching fraction and angular analysis of the decay B0s → ϕμ + μ − 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.7 (Juliol), 2013-07-11)
      The determination of the differential branching fraction and the first angular analysis of the decay B0s → ϕμ + μ − are presented using data, corresponding to an integrated luminosity of 1.0 fb−1, ...

    • Differential branching fraction and angular analysis of Λ 0 b  → Λμ+μ− decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.115 (Juny), 2015-06-17)
      The differential branching fraction of the rare decay Λ 0 b  → Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision ...

    • Differential branching fractions and isospin asymmetries of B → K (*) μ + μ − decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.6 (Juny), 2014-06-26)
      The isospin asymmetries of B → Kμ + μ − and B → K * μ + μ − decays and the partial branching fractions of the B 0 → K 0 μ + μ −, B + → K + μ + μ − and B + → K *+ μ + μ − decays are measured as functions ...

    • Effective lifetime measurements in the B0s → K+K− , B0 → K+π− and B0s → π+K− decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2014, Vol. 736 (Setembre), 2014-09-07)
      Measurements of the effective lifetimes in the B0s→K+K−, B0→K+π− and B0s→π+K− decays are presented using 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. ...

    • Evidence for CP Violation in B+→p¯pK+ Decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 113, No. 14 (Octubre), 2014-09-20)
      Three-body B+→p¯pK+ and B+→p¯pπ+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0  fb−1 collected by the LHCb experiment in proton-proton collisions at center-of-mass ...

    • Evidence for CP Violation in Time-Integrated D0→h−h+ Decay Rates 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 11 (Març), 2012-03-12)
      A search for time-integrated CP violation in D0→h−h+ (h=K, π) decays is presented using 0.62  fb−1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the ...

    • Evidence for the decay B+c→J/ψ3π+2π− 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.2 (Febrer), 2014-05-30)
      Evidence is presented for the decay B+c→J/ψ3π+2π− using proton-proton collision data, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector. A signal yield of 32 ± 8 ...

    • Evidence for the decay B0 → J/ψω and measurementof the relative branching fractions of B0s meson decays to J/ψη and J/ψη′ 

      Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Domingo Bonal, Francesc; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Nuclear Physics B, 2012, Vol. 867, No. 3, 2012-10)
      First evidence of the B0→J/ψω decay is found and the B0s→J/ψη and B0s→J/ψη′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experimentin ...

    • Evidence for the decay X(3872) →ψ(2S)γ 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Nuclear Physics B, 2014, Vol. 886, 2014-09)
      Evidence for the decay mode X(3872) →ψ(2S)γ in B+→X(3872)K+decays is found with a sig-nificance of 4.4 standard deviations. The analysis is based on a data sample of proton–proton collisions, corresponding ...

    • Evidence for the Strangeness-Changing Weak Decay Ξ−b→Λ0bπ− 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 24 (Desembre), 2015-12-11)
      Using a pp collision data sample corresponding to an integrated luminosity of 3.0  fb−1, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξ−b→Λ0bπ−. ...

    • Exclusive J/ψ and ψ(2S) production in pp collisions at √s= 7 TeV 

      Abellan Beteta, Carlos; Domingo Bonal, Francesc; Camboni, Alessandro; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of Physics G-Nuclear and Particle Physics, 2013, Vol. 40, No. 4, 2013-02)
      Exclusive J/ψ and ψ(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between ...

    • First evidence for the annihilation decay mode B+→D+sφ 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.2 (Febrer), 2013-02-07)
      Evidence for the hadronic annihilation decay mode B+→D+sϕ is found with greater than 3σ significance. The branching fraction and CP asymmetry are measured to be $ B(B+→D+sϕ)=(1.87+1.25−0.73(stat)±0.1 ...

    • First Evidence for the Decay B0s→μ+μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 2 (Gener), 2013-01-07)
      A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1  fb−1 of proton-proton ...

    • First evidence for the two-body charmless baryonic decay B0→pp¯¯¯ 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.10 (Octubre), 2013-10-01)
      The results of a search for the rare two-body charmless baryonic decays B0→pp¯¯¯ and B0s→pp¯¯¯ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb−1, of ...

    • First evidence of direct CP violation in charmless two-body decays of B0s mesons 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters , 2012, Vol. 108, No.20 (Maig), 2012-05-16)
      Using a data sample corresponding to an integrated luminosity of 0.35  fb−1 collected by LHCb in 2011, we report the first evidence of CP violation in the decays of B0s mesons to K±π∓ pairs, ...