Recerca: Recent submissions

Now showing items 1281-1300 of 2793

    • Portant el laboratori virtual a l’aula química: alguns coms i alguns perquès 

      Cuadros, Jordi (Educació Química. N.6 (2010), p.4-12, 2010)
      Encara que la utilització didàctica de les simulacions es proposa des de fa dècades, la realitat és que arriba poc a les aules. Sense entrar en els motius que ho generen, en aquest article es discuteixen ...

    • Activitats contextualitzades en el laboratori virtual 

      Cuadros, Jordi; Guitart, Fina; Artigas, Carme (Educació Química. N.14 (2013), p.48-55, 2013)
      En aquest article es presenten quatre activitats noves basades en la utilització del laboratori virtual de «The ChemCollective», destinades a l'ensenyament de la química a l'educació secundària, i se'n ...

    • Breu introducció a la digitalització de la informació química 

      Cuadros, Jordi; Estrada Tejedor, Roger (Educació Química. N.22 (2016), p.31-37, 2016)
      La informació química, que tradicionalment s'havia gestionat a través de llibres, paradigmàticament, a través del Chemical Abstracts Service i dels diversos handbooks, ha migrat progressivament a la ...

    • Usem la Viquipèdia per ensenyar química? 

      Cuadros, Jordi; Dengra, Xavier; Marginet, Roger (Educació Química. N.22 (2016), p.38-47, 2016)
      Tots hem emprat alguna vegada la Viquipèdia. I tots hem escoltat recels sobre la seva validesa acadèmica. Des de l'origen, l'any 2001, les reflexions sobre la seva fiabilitat i la manera adequada d'usar-la ...

    • Measurement of σ(pp → bb X) at √s = 7 TeV in the forward region 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2010, Vol. 694, No. 3 (Novembre), 2010-11-08)
      Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the bb production cross-section in proton–proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In ...

    • Observation of New Ξ0c Baryons Decaying to Λ+cK− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Golobardes, Elisabet; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2020, Vol.124, 222001, 2020-06)
      The Λ+cK− mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6  fb−1 collected by the LHCb experiment. Three ...

    • First Observation of Excited Ω−b States 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2020, Vol.124, 082002, 2020-02)
      We report four narrow peaks in the Ξ0bK− mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9  fb−1 recorded by ...

    • Search for A′→μ+μ− Decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2020, Vol.124, 041801, 2020-01)
      Searches are performed for both promptlike and long-lived dark photons, A′, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for A′→μ+μ− decays using a data ...

    • Precision Measurement of the Mass and Lifetime of the Ξ0b Baryon 

      Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters , 2014, Vol. 113, No.3 (Juliol), 2014-07-15)
      Using a proton-proton collision data sample corresponding to an integrated luminosity of 3  fb−1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ0b→Ξ+cπ−, Ξ+c→pK−π+ signal decays ...

    • Measurement of the B0s→J/ψ¯¯¯¯K*0 branching fraction and angular amplitudes 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2012, No. 86 (Octubre), 2012-10-08)
      A sample of 114±11 B0s→J/ψK−π+ signal events obtained with 0.37  fb−1 of pp collisions at √s=7  TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes ...

    • First observation of the decay B+→π+μ+μ− 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No.12 (Desembre), 2012-12-21)
      A discovery of the rare decay B + → π + μ + μ − is presented. This decay is observed for the first time, with 5.2 σ significance. The observation is made using pp collision data, corresponding to an ...

    • Measurement of CP observables in B± → DK± and B± → Dπ± with D → K0SK±π∓ decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Golobardes, Elisabet; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2020, 58, 2020-05)
      Measurements of CP observables in B± → DK± and B± → Dπ± decays are presented, where D represents a superposition of D0 and D¯¯¯¯0 states. The D meson is reconstructed in the three-body final states ...

    • Facilitating factors for the job placement of workers with intellectual disabilities: supervisors and coworker mentors perspectives 

      Pellicena, Miquel Àngel; Ivern Pascual, Ignasi; Giné Giné, Climent, 1948-; Múries-Cantán, Olga (Advances in Mental Health and Intellectual Disabilities, 28 set. 2020, 2020)
      Purpose – This study aims to contribute to a better understanding of organizational strategies, attitudes and supports that can help people with intellectual disabilities to access competitive jobs ...

    • 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 ...

    • First observation and amplitude analysis of the B−→D+K−π− decay 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2015, Vol.91, No.9 (Maig), 2015-05-05)
      The B−→D+K−π− decay is observed in a data sample corresponding to 3.0  fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. Its branching fraction is measured to be ...

    • Measurement of the Ξ−b and Ω−b baryon lifetimes 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2014, Vol. 736, (Setembre), 2014-09-07)
      Using a data sample of pp collisions corresponding to an integrated luminosity of 3 fb−1, the Ξ−b and Ω−b baryons are reconstructed in the Ξ−b→J/ψΞ− and Ω−b→J/ψΩ− decay modes and their lifetimes measured ...

    • Measurement of the isospin asymmetry inB→K(∗)μ+μ−decays 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2012, Vol. 2012, No.7 (Juliol), 2012-07-20)
      The isospin asymmetries of B → K (∗) μ + μ − decays and the partial branching fractions of B 0 → K 0 μ + μ − and B + → K ∗+ μ + μ − are measured as a function of the di-muon mass squared q 2 using an ...

    • Precision measurement of the ratio of the Λb0 to B¯0 lifetimes 

      Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2014, Vol. 734, (Juny), 2014-06-27)
      The LHCb measurement of the lifetime ratio of the Λ0b to the B⎯⎯⎯0 meson is updated using data corresponding to an integrated luminosity of 3.0 fb−1 collected using 7 and 8 TeV centre-of-mass energy pp ...

    • Fractal Antennas: An Historical Perspective 

      Anguera Pros, Jaume; Andújar Linares, Aurora; Jayasinghe, Jeevani; Chakravarthy, V.S.S.S.; Chowdary, P.S.R.; Pijoan Vidal, Joan Lluís; Ali, Tanweer; Cattani, Carlo (Fractal and Fractional, 2020, Vol. 4, No 1, 2020-01)
      Fractal geometry has been proven to be useful in several disciplines. In the field of antennaengineering, fractal geometry is useful to design small and multiband antenna and arrays, andhigh-directive ...

    • Amplitude analysis of B0 → ¯D0K+π− decays 

      Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2015, Vol.92, No.1 (Juliol), 2015-07-20)
      The Dalitz plot distribution of B0→¯D0K+π− decays is studied using a data sample corresponding to 3.0  fb−1 of pp collision data recorded by the LHCb experiment during 2011 and 2012. The data are described ...