Browsing Recerca by Subject "539"

Now showing items 221-236 of 236

    • Study of D sJ decays to D+K0S and D 0K+ final states in pp collisions 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No.4 (Abril), 2012-10-23)
      A study of D+K0S and D 0 K + final states is performed in a sample of 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of s√=7TeV with the LHCb detector. We confirm the existence of ...

    • Study of forward Z + jet production in pp collisions at s√ = 7 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.1 (Gener), 2014-01-09)
      A measurement of the Z(→ μ + μ −) + jet production cross-section in pp collisions at a centre-of-mass energy s√ = 7 TeV is presented. The analysis is based on an integrated luminosity of 1.0 fb−1 recorded ...

    • Study of the kinematic dependences of Λ 0b production in pp collisions and a measurement of the Λ 0b → Λ +c π − branching fraction 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.8 (Agost), 2014-08-26)
      The kinematic dependences of the relative production rates, fΛ0b/fd, of Λ 0b baryons and B 0 mesons are measured using Λ 0b → Λ +c π − and B¯¯¯¯0 →D+π− decays. The measurements use proton-proton ...

    • Study of the rare B0s and B0 decays into the π+ π− μ+ μ− final state 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2015, Vol. 743 (Abril), 2015-04-09)
      A search for the rare decays B0s→π+π−μ+μ−and B0→π+π−μ+μ−is performed in a data set corresponding to an integrated luminosity of 3.0fb−1collected by the LHCb detector in proton–proton collisions at ...

    • Study of W boson production in association with beauty and charm 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2015, Vol. 92, No. 5 (Setembre), 2015-09-08)
      The associated production of a W boson with a jet originating from either a light parton or heavy-flavor quark is studied in the forward region using proton-proton collisions. The analysis uses data ...

    • Study of η − η′ mixing from measurement of B 0(s)  → J/ψη(′) decay rates 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2015, Vol. 2015, No.1 (Gener), 2015-01-08)
      A study of B and Bs meson decays into J/ψ η and J/ψ η′ final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment ...

    • Study of Υ production and cold nuclear matter effects in pPb collisions at √sNN = 5 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.7 (Juliol), 2014-07-21)
      Production of Υ mesons in proton-lead collisions at a nucleon-nucleon centre-of-mass energy sNN−−−−√ = 5 TeV is studied with the LHCb detector. The analysis is based on a data sample corresponding to ...

    • Study of χb meson production in pp collisions at s√=7 and 8TeV and observation of the decay χb(3P)→Υ(3S)γ 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (The European Physical Journal C, 2014, Vol. 74, no. 10 (Octubre), 2014-10-08)
      A study of χb meson production at LHCb is performed on proton–proton collision data, corresponding to 3.0 fb−1of integrated luminosity collected at centre-of-mass energies s√ = 7 and 8 TeV. The fraction ...

    • Tagged time-dependent angular analysis of B0s→J/ψϕ decays with the 2010 LHCb data 

      LHCb Collaboration - CERN (2011-04)
      The interference between B0s decays to Jψϕ either directly or via B0s−B¯0s oscillation gives rise to a CP violating phase ϕJ/ψϕs. In the Standard Model, this phase is approximately -2βs, where βs = arg ...

    • Tagged time-dependent angular analysis of Bs→J/ψϕ decays with 337~pb−1 at LHCb 

      LHCb Collaboration - CERN (2011-08)
      The interference between Bs decays to J/ψϕ either directly or via Bs−B¯¯¯¯s oscillation gives rise to a CP violating phase ϕJψϕs. Using a sample of 8276±94 Bs→J/ψϕ events extracted from 337~pb−1 of pp ...

    • Test of lepton universality with Λ0b→pK−ℓ+ℓ− decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Golobardes, Elisabet; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2020, 40, 2020-04)
      The ratio of branching fractions of the decays Λ0b → pK−e+e− and Λ0b → pK−μ+μ−, R−1pK, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 ...

    • The Front End Electronics of the Scintillator Pad Detector of the LHCb Calorimeter 

      Abellan Beteta, Carlos; Bota, S.; Comerma, A.; Dieguez, A.; Garrido, L.; Gascon, D.; Gaspar de Valenzuela, Álvaro; Graciani, R.; Grauges, E.; Herms, A.; Llorens, M.; Luengo Alvarez, Sonia; Picatoste, E.; Riera, J.; Roselló Canal, Mar; Ruiz, H.; Tortella, S.; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Proceedings of the Twelfth Workshop on Electronics for LHC and Future Experiments, 2006-09)
      In this paper the Front End electronics of the Scintillator Pad Detector (SPD) is outlined. The SPD is a sub-system of the Calorimeter of the LHCb experiment designed to discriminate between charged and ...

    • Time Alignment and Calibration of the LHCb Calorimeter 

      Calvo Gómez, Míriam; LHCb Collaboration - CERN (2010)

    • Time alignment of the front end electronics of the LHCb calorimeters 

      Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Roselló Canal, Mar; Vilasís Cardona, Xavier (Journal of Instrumentation, 2012, Vol. 7, No.8 (Agost), 2012-08-21)
      LHCb is the experiment at the Large Hadron Collider at CERN designed for performing studies of CP-symmetry violation and rare decays of B-hadrons. Its calorimeter system allows to trigger on photons and ...

    • Updated measurement of decay-time-dependent CP asymmetries in D0→K+K− and D0→π+π− decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2020, Vol. 101, n.1 (Gener), 2020-01)
      A search for decay-time-dependent charge-parity (CP) asymmetry in D0→K+K− and D0→π+π− decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy ...

    • Updated measurements of exclusive J/ψ and ψ(2S) production cross-sections in pp collisions at s√=7 TeV 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of Physics G: Nuclear and Particle Physics, 2014, Vol. 41, No. 5, 2014-02)
      The differential cross-section as a function of rapidity has been measured for the exclusive production of J/ψ and ψ(2S) mesons in proton–proton collisions at √s = 7 TeV, using data collected by the ...