Browsing Recerca by Author "Camboni, Alessandro"

Now showing items 81-100 of 209

    • Measurement of the B0s−B¯0s oscillation frequency Δms in B0s→D−s(3)π decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2012-03-19)
      The B0s–B0soscillation frequency msis measured with 36 pb−1of data collected inppcollisions at √s=7 TeV by the LHCb experiment at the Large Hadron Collider. A total of 1381B0s→D−sπ+andB0s→D−sπ+π−π+signal ...

    • Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s → D_s^-(3) π decays 

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

    • Measurement of the branching fraction of the B0→D+sπ− decay 

      Calvo Gómez, Míriam; Camboni, Alessandro; Golobardes, Elisabet; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (European Physical Journal C, 2021, Vol. 81, No. 314, 2021-04)
      A branching fraction measurement of the B0→D+sπ− decay is presented using proton–proton collision data collected with the LHCb experiment, corresponding to an integrated luminosity of 5.0fb−1. The ...

    • Measurement of the branching fractions of the decays B0s→¯¯¯D0K−π+ and B0→¯¯¯D0K+π− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2013, Vol. 87 , No.11 (Juny), 2013-06-20)
      The first observation of the decay B0s→¯¯¯D0K−π+ is reported. The analysis is based on a data sample, corresponding to an integrated luminosity of 1.0  fb−1 of pp collisions, collected with the LHCb ...

    • Measurement of the charge asymmetry in B±→ϕK±B±→ϕK± and search for B±→ϕπ±B±→ϕπ± 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 charge asymmetry in B±→ϕK±B±→ϕK± decays is measured in a sample of pp collisions at 7 TeV centre-of-mass energy, corresponding to an integrated luminosity of 1.0 fb−1 collected by the ...

    • Measurement of the CKM angle γ from a combination of B±→Dh± analyses 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 726, No. 1-3, (Octubre 2013), 2013-10-07)
      A combination of three LHCb measurements of the CKM angle gamma is presented. The decays B-+/- -> DK +/- and B-+/- -> D pi(+/-) are used, where D denotes an admixture of D-0 and (D) over bar (0) mesons, ...

    • Measurement of the CP Asymmetry in B0→K*0μ+μ− Decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 3 (Gener), 2013-01-17)
      A measurement of the CP asymmetry in B0→K*0μ+μ− decays is presented, based on 1.0  fb−1 of pp collision data recorded by the LHCb experiment during 2011. The measurement is performed in six bins of ...

    • 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 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 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 ...