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

Ara mostrant els elements 141-160 de 320

    • Measurement of the CP-violating phase β in B0 → J/ψ π+ π− decays and límits on penguin effects 

      Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2015, Vol. 742, (Març), 2015-03-06)
      Time-dependent CPviolation is measured in the (—)B0→J/ψπ+π−channel for each π+π−resonant final state using data collected with an integrated luminosity of 3.0fb−1in ppcollisions using the LHCb detector. ...

    • Measurement of the CP-violating phase φs in B0s→J/ψπ+π− decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2012, Vol. 713, No. 4-5 (Juliol), 2012-07-18)
      Measurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ ...

    • Measurement of the CP-violating phase φsin B0s→J/ψπ+π−decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2014, Vol. 736, 2014-09)
      The mixing-induced CP-violating phase in and decays is measured using the final state in data, taken from 3 fb−1 of integrated luminosity, collected with the LHCb detector in 7 and 8 TeV centre-of-mass ...

    • Measurement of the cross-section for Z → e+e- production in pp collisions at s√=7 TeV 

      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)
      A measurement of the cross-section for pp → Z → e+e− is presented using data at s√=7 TeV corresponding to an integrated luminosity of 0.94 fb−1. The process is measured within the kinematic acceptance ...

    • Measurement of the cross-section ratio σ(χc2)/σ(χc1) for prompt χc production at √s=7TeV 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters, 2012, Vol. 714, No. 2-5 (Agost), 2012-08-14)
      The prompt production of the charmonium $\chi_{c1}$ and $\chi_{c2}$ mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The ...

    • Measurement of the D+s − D−s production asymmetry in 7 TeV pp collisions 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2012, Vol. 713, No. 3, (Juliol), 2012-07-09)
      Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the ...

    • Measurement of the differential branching fraction of the decay Λ0b → Λμ+ μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 725, No. 1-3 (Agost 2013), 2013-06)
      The differential branching fraction of the decay $\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$ is measured as a function of the square of the dimuon invariant mass, $q^2$. A yield of $78\pm12$ $\Lambda_b^ ...

    • Measurement of the D± production asymmetry in 7 TeV pp collisions 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 718, No. 3 (Gener 2013), 2013-01-08)
      The asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T ...

    • Measurement of the effective B0s → K+K- lifetime 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 716, No. 3-5, (Octubre 2012), 2012-10-02)
      A precise determination of the effectiveB0s→K+K−lifetime can be used to con-strain contributions from physics beyond the Standard Model in theB0smesonsystem. Conventional approaches selectBmeson ...

    • Measurement of the effective B0s→J/ψK0S lifetime 

      Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Nuclear Physics B, 2013, Vol. 873, No. 2, 2013-08)
      This paper reports the first measurement of the effective B0s→J/ψK0S lifetime and an updated mea-surement of its time-integrated branching fraction. Both measurements are performed with a data sample, ...

    • Measurement of the exclusive Υ production cross-section in pp collisions at s√=7 TeV and 8 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.9 (Setembre), 2015-09-14)
      A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ + μ − final state, using pp collision data recorded by the LHCb experiment. The cross-section ...

    • Measurement of the flavour-specific CP-violating asymmetry assl in B0s decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2014, Vol. 728, (Gener), 2014-01-20)
      The CP-violating asymmetry a_{sl}^s is studied using semileptonic decays of Bs and anti-Bs mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiting a data sample ...

    • Measurement of the forward energy flow in pp collisions at √s = 7 TeV 

      Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Domingo Bonal, Francesc; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (The European Physical Journal C, 2013, Vol. 73, No. 2421, 2013-05)
      The energy flow created in pp collisions at √s = 7 TeV is studied within the pseudorapidity range 1.9 <η< 4.9 with data collected by the LHCb experiment. The measurements are performed for inclusive ...

    • Measurement of the forward Z boson production cross-section in pp collisions at s√=7 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.8 (Agost), 2015-08-10)
      A measurement of the production cross-section for Z bosons that decay to muons is presented. The data were recorded by the LHCb detector during pp collisions at a centre-of-mass energy of 7 TeV, and ...

    • Measurement of the forward-backward asymmetry in Z/γ∗ → μ + μ − decays and determination of the effective weak mixing angle 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.11 (Noviembre), 2015-11-27)
      The forward-backward charge asymmetry for the process qq¯¯→Z/γ∗→μ+μ− is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data ...

    • Measurement of the fraction of Υ (1S) originating from χb (1P) decays in pp collisions at√s= 7 TeV 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No. 11 (Novembre), 2012-11-08)
      The production of χb(1P ) mesons in pp collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb−1 of data collected with the LHCb detector. The χb(1P ) mesons are reconstructed in the decay ...

    • Measurement of the fragmentation fraction ratio f s /f d and its dependence on B meson kinematics 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.4 (Abril), 2013-04-02)
      The relative production rate of B0s and B 0 mesons is determined with the hadronic decays B0s→D−sπ+ and B 0 → D − K +. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass ...

    • Measurement of the inclusive phi cross-section in pp collisions at sqrt(s) = 7 TeV. 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 703, No. 3 (Setembre 2011), 2011-07)
      The cross-section for inclusive Φ meson production in pp collisions at a centre-of-mass energy of s=7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section ...

    • Measurement of the inelastic pp cross-section at a centre-of-mass energy of s√ = 7 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.2 (Febrer), 2015-02-19)
      The cross-section for inelastic proton-proton collisions, with at least one prompt long-lived charged particle of transverse momentum p T > 0.2GeV/c in the pseudorapidity range 2.0 < η < 4.5, is measured ...

    • Measurement of the isospin asymmetry inB→K(∗)μ+μ−decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No.7 (Juliol), 2012-07-20)
      The isospin asymmetries of B → K (∗) μ + μ − decays and the partial branching fractions of B 0 → K 0 μ + μ − and B + → K ∗+ μ + μ − are measured as a function of the di-muon mass squared q 2 using an ...