Browsing Recerca by Author "CERN"

Now showing items 161-180 of 324

    • Measurement of the lifetime of the Bc+ meson using the Bc+→ J/ψπ+ decay mode 

      Calvo Gómez, Míriam; LHCb Collaboration - CERN (Physics Letters B , 2015, Vol. 742, (Març), 2015-03-06)
      The difference in total widths between the Bc+ and B+mesons is measured using a data sample corresponding to an integrated luminosity of 3.0 fb-1collected by the LHCb experiment in 7 and 8 TeV centre-of-mass ...

    • Measurement of the polarization amplitudes and triple product asymmetries in the B s 0 → ϕ ϕ decay 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2012, Vo. 713, No. 4-5 (Juliol 2012), 2012-07-18)
      Using 1.0 fb^{-1} of pp collision data collected at a centre-of-mass energy of sqrt{s}=7 TeV with the LHCb detector, measurements of the polarization amplitudes, strong phase difference and triple product ...

    • Measurement of the polarization amplitudes in B0→J/ψK∗(892)0 decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2013, Vol. 88 , No.5 (Setembre), 2013-09-03)
      An analysis of the decay B0→J/ψK∗(892)0 is presented using data, corresponding to an integrated luminosity of 1.0  fb−1, collected in pp collisions at a center-of-mass energy of 7 TeV with the LHCb ...

    • Measurement of the ratio of B+c branching fractions to J/ψπ+ and J/ψμ+νμ final states 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2014, Vol. 90 , No.3 (Agost), 2014-08-27)
      The first measurement that relates semileptonic and hadronic decay rates of the B+c meson is performed using proton-proton collision data corresponding to 1.0  fb−1 of integrated luminosity collected ...

    • Measurement of the ratio of branching fractions B(B0 → K∗0γ )/B(B0 s → φγ ) and the direct CP asymmetry in B0 → K∗0γ 

      Abellan Beteta, Carlos; Calvo Gómez, Míriam; Domingo Bonal, Francesc; Roselló Canal, Mar; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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(B0→K*0γ)/B(B0s→ϕγ) 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2012, Vol. 85 , No.11 (Juny), 2012-06-25)
      The ratio of branching fractions of the radiative B decays B0→K*0γ and B0s→ϕγ has been measured using 0.37  fb−1 of pp collisions at a center of mass energy of √s=7  TeV, collected by the LHCb experiment. ...

    • Measurement of the ratio of branching fractions B(Bd→K∗0γ)/B(Bs→ϕγ) with the LHCb experiment at s√=7~TeV 

      LHCb Collaboration - CERN (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 Branching Fractions B(¯B0→D*+τ−¯ντ)/B(¯B0→D*+μ−¯νμ) 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 11 (Setembre), 2015-09-09)
      The branching fraction ratio R(D∗)≡B(¯B0→D*+τ−¯ντ)/B(¯B0→D*+μ−¯νμ) is measured using a sample of proton-proton collision data corresponding to 3.0  fb−1 of integrated luminosity recorded by the LHCb ...

    • Measurement of the ratio of prompt χc to J/ψ production in pp collisions at √s=7TeV 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.6 (Juny), 2015-06-18)

    • Measurement of the time-dependent CP asymmetry in B0 → J/ψ K0S decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, Vol. 721, No. 1-3 (Abril 2013), 2013-04-10)
      This Letter reports a measurement of the CP violation observables S J/ψK0S and C J/ψK0S in the decay channel B0 → J/ψ K0S performed with 1.0 fb-1 of pp collisions at √s = 7 TeV collected by the LHCb ...

    • Measurement of the time-integrated CP asymmetry in D 0 → K 0S K 0S decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 ¯B0s Meson Lifetime in D+sπ− Decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 113, No. 17 (Octubre), 2014-10-24)
      We present a measurement of the ratio of the ¯B0s meson lifetime, in the flavor-specific decay to D+sπ−, to that of the ¯B0 meson. The pp collision data used correspond to an integrated luminosity of ...

    • Measurement of the ¯B0s→D−sD+s and ¯B0s→D−D+s Effective Lifetimes 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 112, No. 11 (Març), 2014-03-19)
      The first measurement of the effective lifetime of the ¯B0s meson in the decay ¯B0s→D−sD+s is reported using a proton-proton collision data set, corresponding to an integrated luminosity of 3  fb−1, ...

    • Measurement of the ηc(1S) production cross-section in p p collisions at s√=13 TeV 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 ...