Articles publicats en revistes: Recent submissions

Now showing items 341-360 of 538

    • First Measurement of the CP-Violating Phase in B0s→ϕϕ Decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 24 (Juny), 2013-06-12)
      A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s→ϕϕ decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the ...

    • Observation of Excited Λ0b Baryons 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 109, No. 7 (Octubre), 2012-10-26)
      Using pp collision data corresponding to 1.0  fb−1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Λ0bπ+π− spectrum with masses 5911.97±0.12(stat)±0.02(syst ...

    • Determination of the X(3872) Meson Quantum Numbers 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 22 (Maig), 2013-05-29)
      The quantum numbers of the X(3872) meson are determined to be JPC=1++ based on angular correlations in B+→X(3872)K+ decays, where X(3872)→π+π−J/ψ and J/ψ→μ+μ−. The data correspond to 1.0  fb−1 of pp ...

    • 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, ...

    • Observation of B0→¯¯¯D0K+K− and Evidence for B0s→¯¯¯D0K+K− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 109, No. 13 (Setembre), 2012-09-26)
      The first observation of the decay B0→¯¯¯D0K+K− is reported from an analysis of 0.62  fb−1 of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of ...

    • Observation of a Resonance in B+→K+μ+μ− Decays at Low Recoil 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 111, No. 11 (Setembre), 2013-09-10)
      A broad peaking structure is observed in the dimuon spectrum of B+→K+μ+μ− decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with ...

    • Observation of the B0s→η′η′ Decay 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 5 (Juliol), 2015-07-28)
      The first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0  fb−1 of integrated luminosity collected 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 ...

    • 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 Evidence for the Decay B0s→μ+μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 2 (Gener), 2013-01-07)
      A search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1  fb−1 of proton-proton ...

    • Observation of B(s)(0) → J/ψf(2)'(1525) in J/ψK+ K- final states 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 15 (Abril), 2012-04-09)
      The decay ¯¯¯B0s→J/ψK+K− is investigated using 0.16  fb−1 of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/ψϕ channel is well known, final states at higher K+K− masses ...

    • Evidence for CP Violation in Time-Integrated D0→h−h+ Decay Rates 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 11 (Març), 2012-03-12)
      A search for time-integrated CP violation in D0→h−h+ (h=K, π) decays is presented using 0.62  fb−1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the ...

    • Observation of D0−¯¯¯D0 Oscillations 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 110, No. 10 (Març), 2013-03-05)
      We report a measurement of the time-dependent ratio of D0→K+π− to D0→K−π+ decay rates in D*+-tagged events using 1.0  fb−1 of integrated luminosity recorded by the LHCb experiment. We measure the mixing ...

    • Study of Beauty Hadron Decays into Pairs of Charm Hadrons 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 112, No. 20 (Maig), 2014-05-21)
      First observations of the decays Λ0b→Λ+cD−(s) are reported using data corresponding to an integrated luminosity of 3  fb−1 collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions ...

    • Measurement of CP Violation in the Phase Space of B±→K±π+π− and B±→K±K+K− Decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2013, Vol. 111, No. 10 (Setembre), 2013-09-03)
      The charmless decays B±→K±π+π− and B±→K±K+K− are reconstructed using data, corresponding to an integrated luminosity of 1.0  fb−1, collected by LHCb in 2011. The inclusive charge asymmetries of these ...

    • Search for Lepton Number Violating Decays B+→π−μ+μ+ and B+→K−μ+μ+ 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 10 (Març), 2012-03-07)
      A search is performed for the lepton number violating decay B+→h−μ+μ+, where h− represents a K− or a π−, using an integrated luminosity of 36  pb−1 of data collected with the LHCb detector. The decay ...

    • Strong Constraints on the Rare Decays B0s→μ+μ− and B0→μ+μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 23 (Juny), 2012-06-05)
      A search for B0s→μ+μ− and B0→μ+μ− decays is performed using 1.0  fb−1 of pp collision data collected at √s=7  TeV with the LHCb experiment at the Large Hadron Collider. For both decays, the number of ...

    • First Observation of the Decay B+c→J/ψπ+π−π+ 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2012, Vol. 108, No. 25 (Juny), 2012-06-19)
      The decay B+c→J/ψπ+π−π+ is observed for the first time, using 0.8  fb−1 of pp collisions at √s=7  TeV collected by the LHCb experiment. The ratio of branching fractions B(B+c→J/ψπ+π−π+)/B(B+c→J/ψπ+) is ...

    • Evidence for the Strangeness-Changing Weak Decay Ξ−b→Λ0bπ− 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 24 (Desembre), 2015-12-11)
      Using a pp collision data sample corresponding to an integrated luminosity of 3.0  fb−1, collected by the LHCb detector, we present the first search for the strangeness-changing weak decay Ξ−b→Λ0bπ−. ...

    • Observation of the suppressed ADS modes B± → [π± K∓ π+ π−] DK± and B± → [π± K∓ π+ π−] Dπ 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 723, No. 1-3 (Juny), 2013-06-10)
      An analysis of B±→DK±B±→DK± and B±→Dπ±B±→Dπ± decays is presented where the D meson is reconstructed in the four-body final state K±π∓π+π−K±π∓π+π−. Using LHCb data corresponding to an integrated luminosity ...