Browsing Articles publicats en revistes by Subject "53"
Now showing items 1-20 of 88
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A comprehensive sounding of the ionospheric HF radio link from Antarctica to Spain
(Radio Science, 2013. Vol.48, 1, Gener - Febrer, 2013-01)Since 2003, our group has been investigating the performance of different transmission techniques for low-power low-interference High Frequency (HF) ionospheric communication systems. Specifically, we ... -
A study of CP violation in B±→DK± and B±→Dπ± decays with D→K0SK±π∓ final states
(Physics Letters B , 2014, Vol. 733 (Juny), 2014-06-02)A first study of CP violation in the decay modes B±→[K0SK±π∓]Dh± and B±→[K0SK∓π±]Dh±, where h labels a K or π meson and D labels a D0 or D⎯⎯⎯0 meson, is performed. The analysis uses the LHCb data set ... -
Amplitude analysis and branching fraction measurement of ¯Bos → J/ψ K+K−
(Physical Review D, 2013, Vol. 87 , No.7 (Abril), 2013-04-08)An amplitude analysis of the final state structure in the ¯¯¯B0s→J/ψK+K− decay mode is performed using 1.0 fb−1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy pp collisions ... -
An example of operation for a partly manned Antarctic geomagnetic observatory and the development of a radio link for data transmission
(Annals of Geophysics, 2009. Vol. 52, 1 (Febrer), 2009-02)The experience acquired from more than ten years of operation of an Antarctic geomagnetic observatory is described along with the development of data transmission facilities. The observatory was deployed ... -
Analysis of the resonant components in ¯B0s → J/ψ π+ π−
(Physical Review D, 2012, Vol. 86 , No.5 (Setembre), 2012-09-17)The decay ¯¯¯B0s→J/ψπ+π− can be exploited to study CP violation. A detailed understanding of its structure is imperative in order to optimize its usefulness. An analysis of this three-body final state ... -
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. ... -
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 ... -
Determination of the X(3872) Meson Quantum Numbers
(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 ... -
Determination of γ and −2βs from charmless two-body decays of beauty mesons
(Physics Letters B , 2015, Vol. 741 (Febrer), 2015-02-04)Using the latest LHCb measurements of time-dependent CP violation in the B-s(0) -> K+K- decay, a U-spin relation between the decay amplitudes of B-s(0) -> K+K- and B-0 -> p(+)p(-) decay processes allows ... -
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 ... -
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 ... -
Evidence for CP Violation in Time-Integrated D0→h−h+ Decay Rates
(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 ... -
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−. ... -
First Evidence for the Decay B0s→μ+μ−
(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 ... -
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 ... -
First Measurement of the CP-Violating Phase in B0s→ϕϕ Decays
(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 ... -
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 ... -
First observation of B0 → D∗+ Xμ−ν decays
(Physics Letters B, Vol. 698, No. 1 (Març 2011), 2011)Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are detected. Two structures ... -
First observation of B0s → J/ψ f0(980) decays
(Physics Letters B, Vol. 698, No 2 (Abril 2011), 2011-01)Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decayB0s→J/ψf0(980) is observed. ThisCP eigenstate mode could be used to measure ... -
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 ...