Articles publicats en revistes: Enviaments recents
Ara mostrant els elements 361-380 de 546
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Observation of D0−¯¯¯D0 Oscillations
(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
(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
(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+
(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−
(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+
(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−
(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
(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 ... -
Performance of Beamwidth Constrained Linear Array Synthesis Techniques Using Novel Evolutionary Computing Tools
(ACES Journal, 2018. Vol. 33, 3 (Març), 2018-03)Antenna array synthesis for desired radiation characteristics is a challenging field of research in electromagnetics. When an array synthesis problem is visualized as an optimization problem several ... -
Transition towards a digital architecture: new conceptions on materiality and nature
(Archidoct, 2015. Vol. 2, Nº2 (Febrer), 2015-02)Industrialized societies are undergoing a transition towards an informational era, in which modes of production and culture, once transformed by industrialization, are being modi½ed ... -
Using IEC 61850 GOOSE Service for Adaptive ANSI 67/67N Protection in Ring Main Systems with Distributed Energy Resources
(Energies, 2017. Vol. 10, 11, 2017-10)Smart Grids are electricity networks that use digital technology to co-ordinate the needs and capabilities of all generators, grid operators, end users and electricity market stakeholders in such away ... -
Differential Branching Fraction and Angular Analysis of the Decay B0 → K*0 μ+ μ−
(Physical Review Letters, 2012, Vol. 108, No. 18 (Maig), 2012-05-03)The angular distributions and the partial branching fraction of the decay B0→K*0μ+μ− are studied by using an integrated luminosity of 0.37 fb−1 of data collected with the LHCb detector. The forward-backward ... -
Measurement of b-hadron masses
(Physics Letters B , 2012, Vol. 708, No. 3 -5 (Febrer), 2012-02-28)Measurements of b-hadron masses are performed with the exclusive decay modes B+ -> J/psi K+, B0 -> J/psi K*0, B0 -> J/psi K0S, B0_s -> J/psi phi and Lambda_b -> J/psi Lambda using an integrated luminosity ... -
Measurement of the ¯B0s Meson Lifetime in D+sπ− Decays
(Physical Review Letters, 2014, Vol. 113, No. 17 (Octubre), 2014-10-24)We present a measurement of the ratio of the ¯B0s meson lifetime, in the flavor-specific decay to D+sπ−, to that of the ¯B0 meson. The pp collision data used correspond to an integrated luminosity of ... -
First Observation of a Baryonic B+c Decay
(Physical Review Letters, 2014, Vol. 113, No. 15 (Octubre), 2014-10-10)A baryonic decay of the B+c meson, B+c→J/ψp¯pπ+, is observed for the first time, with a significance of 7.3 standard deviations, in pp collision data collected with the LHCb detector and corresponding ... -
Determination of the Sign of the Decay Width Difference in the B0s System
(Physical Review Letters, 2012, Vol. 108, No. 24 (Juny), 2012-06-11)The interference between the K+K− S-wave and P-wave amplitudes in B0s→J/ψK+K− decays with the K+K− pairs in the region around the ϕ(1020) resonance is used to determine the variation of the difference ... -
Measurements of the Λ0b → J/ψ Λ decay amplitudes and the Λ0b polarisation in pp collisions at √s=7 TeV
(Physics Letters B , 2013, Vol. 724, No.1-3 (Juliol), 2013-07-09)An angular analysis of Lambda_b0 -> J/psi Lambda decays is performed using a data sample corresponding to 1.0 fb^{-1} collected in pp collisions at sqrt(s) = 7 TeV with the LHCb detector at the LHC. A ... -
Search for the rare decay D0 → μ+μ−
(Physics Letters B , 2013, Vol. 725, No.1-3 (Agost), 2013-08-09)A search for the rare decay D-0 -> mu(+) mu(-) is performed using a data sample, corresponding to an integrated luminosity of 0.9 fb(-1), of pp collisions collected at a centre-of-mass energy of 7 TeV ... -
Search for D+(s) → π+μ+μ− and D+(s) → π−μ+μ+ decays
(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 ... -
Contiguous Frequency-Time Resource Allocation and Scheduling for Wireless OFDMA Systems with QoS Support
(EURASIP Journal on Wireless Communications and Networking, 2009, 2009-02)The orthogonal frequency divisionmultiple access (OFDMA) scheme has been selected as a potential candidate formany emerging broadband wireless access standards. In this paper, a new joint scheduling and ...