Listando Recerca por autor/a "CERN"
Mostrando ítems 258-277 de 324
-
Precision measurement of the Ξ++cc mass
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2020, 49, 2020-02)A measurement of the Ξ++cc mass is performed using data collected by the LHCb experiment between 2016 and 2018 in pp collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated ... -
Production of J/ψ and Υ mesons in pp collisions at s√=8 TeV
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.6 (Juny), 2013-06-14)The production of J/ψ and Υ mesons in pp collisions at s√=8 TeV is studied with the LHCb detector. The J/ψ and Υ mesons are reconstructed in the μ + μ − decay mode and the signal yields are determined ... -
Prompt charm production inppcollisions at √s=7 TeV
Abellan Beteta, Carlos; Calvo Gómez, Míriam; Camboni, Alessandro; Domingo Bonal, Francesc; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Nuclear Physics B, 2013, Vol. 871, No. 1, 2013-06)Charm production at the LHC in pp collisions at √s=7 TeV is studied with the LHCb detector. The decays D0→K−π+,D+→K−π+π+,D∗+→D0(K−π+)π+,D+s→φ(K−K+)π+,Λ+c→pK−π+, and their charge conjugates are analysed ... -
Prompt Kshort production in pp collisions at sqrt(s)=0.9 TeV
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2010, Vol. 693, No. 2 (Setembre), 2010-09-27)The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined ... -
Quantum numbers of the X(3872) state and orbital angular momentum in its ρ0J/ψ decay
Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2015, Vol.92, No.1 (Juliol), 2015-07-30)Angular correlations in B+→X(3872)K+ decays, with X(3872)→ρ0J/ψ, ρ0→π+π− and J/ψ→μ+μ−, are used to measure orbital angular momentum contributions and to determine the JPC value of the X(3872) meson. The ... -
Road map for selected key measurements from LHCb
Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (2010-02-16)Six of the key physics measurements that will be made by the LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The 'road map' towards the precision measurements is ... -
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 ... -
Search for CP violation in D + → ϕπ + and D+s→K0Sπ+ decays
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2013, Vol. 2013, No.6 (Juny), 2013-06-28)A search for CP violation in D + → ϕπ + decays is performed using data collected in 2011 by the LHCb experiment corresponding to an integrated luminosity of 1.0 fb−1 at a centre of mass energy of 7 TeV. ... -
Search for CP violation in D+ → K−K+π+ decays
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review D, 2011, Vol. 84 , No. 11 (Desembre), 2011-12-28)A model-independent search for direct CP violation in the Cabibbo-suppressed decay D+→K−K+π+ in a sample of approximately 370 000 decays is carried out. The data were collected by the LHCb experiment ... -
Search for CP violation in D+(s)→h+π0 and D+(s)→h+η decays
LHCb Collaboration - CERN; Calvo Gómez, Míriam; Camboni, Alessandro; Golobardes, Elisabet; Valls Canudas, Núria; Vilasís Cardona, Xavier (Journal of High Energy Physics, 2021, Vol.6, No. 19, 2021-06)Searches for CP violation in the two-body decays D+(s)→h+π0 and D+(s)→h+η (where h+ denotes a π+ or K+ meson) are performed using pp collision data collected by the LHCb experiment corresponding to ... -
Search for CP violation in D0 → π− π+ π0 decays with the energy test
Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2015, Vol. 740, (Gener), 2015-01-05)A search for time-integrated CP violation in the Cabibbo-suppressed decay D-0 -> pi(-)pi(+)pi(0) ir is performed using for the first time an unbinned model-independent technique known as the energy test. ... -
Search for CP violation in the decay D+→π−π+π+
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B , 2014, Vol. 728, (Gener), 2014-01-20)A search for CP violation in the phase space of the decay $D^+\to\pi^-\pi^+\pi^+$ is reported using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb ... -
Search for CP violation using T-odd correlations in D 0 → K + K −π+π− decays
Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Journal of High Energy Physics, 2014, Vol. 2014, No.10 (Octubre), 2014-10-01)A search for CP violation using T-odd correlations is performed using the four-body D 0 → K + K −π+π− decay, selected from semileptonic B decays. The data sample corresponds to integrated luminosities ... -
Search for D+(s) → π+μ+μ− and D+(s) → π−μ+μ+ decays
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 724, No. 4-5 (Juliol), 2013-07-23)A search for non-resonant D+(s) to pi+mu+mu- and D+(s) to pi-mu+mu+ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb-1, at sqrt(s) = 7 TeV ... -
Search for direct CP violation in D0 → h−h+ modes using semileptonic B decays
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physics Letters B, 2013, Vol. 723, No. 1-3 (Juny), 2013-06-10)A search for direct CP violation in D0 -> h- h+ (where h=K or pi) is presented using data corresponding to an integrated luminosity of 1.0 fb^-1 collected in 2011 by LHCb in pp collisions at a centre-of-mass ... -
Search for Hidden-Sector Bosons in B0→K*0μ+μ− Decays
Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2015, Vol. 115, No. 16 (Octubre), 2015-10-16)A search is presented for hidden-sector bosons, χ, produced in the decay B0→K∗(892)0χ, with K∗(892)0→K+π− and χ→μ+μ−. The search is performed using pp-collision data corresponding to 3.0 fb−1 collected ... -
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 ... -
Search for long-lived particles decaying to e ± μ∓ ν
Calvo Gómez, Míriam; Golobardes, Elisabet; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (European Physical Journal C, 2021, Vol. 81, No. 261, 2021-03)Long-lived particles decaying to e±μ∓ν, with masses between 7 and 50GeV/c2 and lifetimes between 2 and 50ps, are searched for by looking at displaced vertices containing electrons and muons of opposite ... -
Search for long-lived particles decaying to jet pairs
Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (The European Physical Journal C, 2015, Vol. 75, no. 4 (Abril), 2015-04-17)A search is presented for long-lived particles with a mass between 25 and 50 GeV/c2 and a lifetime between 1 and 200ps in a sample of proton–proton collisions at a centre-of-mass energy of s√=7 TeV, ... -
Search for Majorana Neutrinos in B−→π+μ−μ− Decays
Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN (Physical Review Letters, 2014, Vol. 112, No. 13 (Abril), 2014-04-03)A search for heavy Majorana neutrinos produced in the B−→π+μ−μ− decay mode is performed using 3 fb−1 of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies ...