Browsing by Author "Badalov, Alexey"

Now showing items 21-40 of 110

    • First Observation of a Baryonic B+c Decay 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 113, No. 15 (Octubre), 2014-10-10)
      A baryonic decay of the B+c meson, B+c→J/ψp¯pπ+, is observed for the first time, with a significance of 7.3 standard deviations, in pp collision data collected with the LHCb detector and corresponding ...

    • First Observation of Top Quark Production in the Forward Region 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 11 (Setembre), 2015-09-08)
      Top quark production in the forward region in proton-proton collisions is observed for the first time. The W+b final state with W→μν is reconstructed using muons with a transverse momentum, pT, larger ...

    • First observations of the rare decays B + → K + π + π − μ + μ − and B +→ ϕK + μ + μ − 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.10 (Octubre), 2014-10-09)
      First observations of the rare decays B + → K + π + π − μ + μ − and B +→ ϕK +μ+μ− are presented using data corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment at ...

    • Forward production of Υ mesons in pp collisions at s√=7 and 8 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.11 (Novembre), 2015-11-16)
      The production of Υ mesons in pp collisions at s√=7 and 8 TeV is studied with the LHCb detector using data samples corresponding to an integrated luminosity of 1 fb−1 and 2 fb−1 respectively. The ...

    • Identification of beauty and charm quark jets at LHCb 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of Instrumentation, 2015, Vol. 10, 2015-06)
      Identification of jets originating from beauty and charm quarks is important for measuring Standard Model processes and for searching for new physics. The performance of algorithms developed to select ...

    • Measurement of B+c Production in Proton-Proton Collisions at √s=8  TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 114, No. 13 (Abril), 2015-04-02)
      Production of B+c mesons in proton-proton collisions at a center-of-mass energy of 8 TeV is studied with data corresponding to an integrated luminosity of 2.0  fb−1 recorded by the LHCb experiment. The ...

    • Measurement of charged particle multiplicities and densities in pp collisions at s√=7TeV in the forward region 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (The European Physical Journal C, 2014. Vol. 74, No. 5 (Maig), 2014-05-24)
      Charged particle multiplicities are studied in proton–proton collisions in the forward region at a centre-of-mass energy of s√=7TeV with data collected by the LHCb detector. The forward spectrometer ...

    • Measurement of CP asymmetries and polarisation fractions in B0s→K∗0K¯¯¯¯¯∗0 decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.7 (Juliol), 2015-07-30)
      An angular analysis of the decay B0s→K∗0K¯¯¯¯¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy s√=7 ...

    • Measurement of CP asymmetries in the decays B 0 → K *0 μ + μ − and B + → K + μ + μ − 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.9 (Setembre), 2014-09-30)
      The direct CP asymmetries of the decays B 0 → K *0 μ + μ − and B + → K + μ + μ − are measured using pp collision data corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector. ...

    • Measurement of CP asymmetry in B 0 s  → D ∓ s K ± decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.11 (Novembre), 2014-11-13)
      We report on measurements of the time-dependent CP violating observables in B 0 s  → D ∓ s K ± decays using a dataset corresponding to 1.0 fb−1 of pp collisions recorded with the LHCb detector. We find ...

    • Measurement of CP asymmetry in D0 → K−K+ and D0 → π −π + decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, No. 41, 2014-07)
      Time-integrated CP asymmetries in D0 decays to the final states K−K+ and π −π + are measured using proton-proton collisions corresponding to 3 fb−1 of integrated luminosity collected at centre-of-mass ...

    • Measurement of CP violation and constraints on the CKM angle γ in B±→DK±with D→K0S π+π− decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Nuclear Physics B, 2014, Vol. 888, 2014-11)
      A model-dependent amplitude analysis of B± → DK± with D → KS0π+π− decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 1fb−1, recorded by LHCb at a ...

    • Measurement of CP violation in B0s → ϕϕ decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2014, Vol. 90 , No.5 (Setembre), 2014-09-30)
      A measurement of the decay time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented, along with measurements of the T-odd triple-product asymmetries. In this decay channel, the CP-violating ...

    • Measurement of CP Violation in B0→J/ψK0S Decays 

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

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

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 forward J/ψ production cross-sections in pp collisions at s√=13 TeV 

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

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (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 indirect CP asymmetries in D0 → K−K+ and D0 → π −π + decays using semileptonic B decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, No. 43, 2015-04)
      Time-dependent CP asymmetries in the decay rates of the singly Cabibbosuppressed decays D0 → K−K+ and D0 → π −π + are measured in pp collision data corresponding to an integrated luminosity of 3.0 ...

    • Measurement of polarization amplitudes and CP asymmetries in B 0 → ϕK *(892)0 

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