Articles publicats en revistes: Recent submissions
Now showing items 321-340 of 538
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Search for Hidden-Sector Bosons in B0→K*0μ+μ− Decays
(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 ... -
Observation of ¯B0(s)→J/ψ f1(1285) Decays and Measurement of the f1(1285) Mixing Angle
(Physical Review Letters, 2014, Vol. 112, No. 9 (Març), 2014-03-04)Decays of ¯B0s and ¯B0 mesons into J/ψ π+π−π+π− final states, produced in pp collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3 fb−1 collected with the ... -
Measurement of the Λ0b, Ξ−b, and Ω−b Baryon Masses
(Physical Review Letters, 2013, Vol. 110, No. 18 (Maig), 2013-05-02)Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb−1 of data collected in 2011 with the LHCb detector. Significant Λ0b→J/ψΛ, Ξ−b→J/ψΞ− and Ω−b→J/ψΩ− signals are observed ... -
Measurement of the CP Asymmetry in B0→K*0μ+μ− Decays
(Physical Review Letters, 2013, Vol. 110, No. 3 (Gener), 2013-01-17)A measurement of the CP asymmetry in B0→K*0μ+μ− decays is presented, based on 1.0 fb−1 of pp collision data recorded by the LHCb experiment during 2011. The measurement is performed in six bins of ... -
Determination of fs/fd for 7 TeV pp Collisions and Measurement of the B0→D−K+ Branching Fraction
(Physical Review Letters, 2011, Vol. 107, No. 21 (Novembre), 2011-11-14)The relative abundance of the three decay modes B0→D−K+, B0→D−π+, and B0s→D−sπ+ produced in 7 TeV pp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35 pb−1. ... -
Measurements of Bþ c Production and Mass with the Bþ c ! J=c þ Decay
(Physical Review Letters, 2012, Vol. 109, No. 23 (Desembre), 2012-12-05)Measurements of B+c production and mass are performed with the decay mode B+c→J/ψπ+ using 0.37 fb−1 of data collected in pp collisions at √s=7 TeV by the LHCb experiment. The ratio of the production ... -
First Observation of CP Violation in the Decays of B0s Mesons
(Physical Review Letters, 2013, Vol. 110, No. 22 (Maig), 2013-05-30)Using pp collision data corresponding to an integrated luminosity of 1.0 fb−1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in ... -
Measurement of D0–¯¯¯D0 Mixing Parameters and Search for CP Violation Using D0→K+π− Decays
(Physical Review Letters, 2013, Vol. 111, No. 25 (Desembre), 2013-12-18)Measurements of charm mixing parameters from the decay-time-dependent ratio of D0→K+π− to D0→K−π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb−1 of ... -
Measurement of B+c Production in Proton-Proton Collisions at √s=8 TeV
(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 ... -
Observation of Overlapping Spin-1 and Spin-3 ¯D0K− Resonances at Mass 2.86 GeV/c2
(Physical Review Letters, 2014, Vol. 113, No. 16 (Octubre), 2014-10-14)The resonant substructure of B0s→¯D0K−π+ decays is studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collision data recorded by the LHCb detector. An excess at ... -
Observation of J/ψp Resonances Consistent with Pentaquark States in Λ0b→J/ψK−p Decays
(Physical Review Letters, 2015, Vol. 115, No. 7 (Agost), 2015-08-12)Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ0b→J/ψK−p decays are presented. The data sample corresponds to an integrated luminosity of ... -
Search for Majorana Neutrinos in B−→π+μ−μ− Decays
(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 ... -
Precision Measurement of the Mass and Lifetime of the Ξ0b Baryon
(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 ... -
Observation of Photon Polarization in the b→sγ Transition
(Physical Review Letters, 2014, Vol. 112, No. 16 (Abril), 2014-04-22)This Letter presents a study of the flavor-changing neutral current radiative B±→K±π∓π±γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass ... -
Measurement of CP Violation in B0→J/ψK0S Decays
(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 ... -
First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production
(Physical Review Letters, 2014, Vol. 113, No. 8 (Agosto), 2014-08-20)The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in b¯b pair production at a hadron collider. The ... -
Test of Lepton Universality Using B+→K+ℓ+ℓ− Decays
(Physical Review Letters, 2014, Vol. 113, No. 15 (Octubre), 2014-10-06)A measurement of the ratio of the branching fractions of the B+→K+μ+μ− and B+→K+e+e− decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, ... -
Observation of the Resonant Character of the Z(4430)− State
(Physical Review Letters, 2014, Vol. 112, No. 22 (Juny), 2014-06-04)Resonant structures in B0→ψ′π−K+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb−1 collected with the LHCb detector. The ... -
First Observation of the Decay B∗s2(5840)0→B*+K− and Studies of Excited B0s Mesons
(Physical Review Letters, 2013, Vol. 110, No. 15 (Abril), 2013-04-09)The properties of the orbitally excited (L=1) B0s states are studied by using 1.0 fb−1 of pp collisions at √s=7 TeV collected with the LHCb detector. The first observation of the B∗s2(5840)0 meson ... -
Evidence for CP Violation in B+→p¯pK+ Decays
(Physical Review Letters, 2014, Vol. 113, No. 14 (Octubre), 2014-09-20)Three-body B+→p¯pK+ and B+→p¯pπ+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment in proton-proton collisions at center-of-mass ...