Browsing Articles publicats en revistes by Subject "Mesons"
Now showing items 1-20 of 46
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Addendum: Observation of double charm production involving open charm in pp collisions at√s= 7 TeV
(Journal of High Energy Physics, 2041, Vol. 2014, No.3 (Març), 2014-03-24) -
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 ... -
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 ... -
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 ... -
Exclusive J/ψ and ψ(2S) production in pp collisions at √s= 7 TeV
(Journal of Physics G-Nuclear and Particle Physics, 2013, Vol. 40, No. 4, 2013-02)Exclusive J/ψ and ψ(2S) vector meson production has been observed in the dimuon channel using the LHCb detector. The cross-section times branching fractions to two muons with pseudorapidities between ... -
First evidence of direct CP violation in charmless two-body decays of B0s mesons
(Physical Review Letters , 2012, Vol. 108, No.20 (Maig), 2012-05-16)Using a data sample corresponding to an integrated luminosity of 0.35 fb−1 collected by LHCb in 2011, we report the first evidence of CP violation in the decays of B0s mesons to K±π∓ pairs, ... -
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 ... -
First observation of the decay B0s→ϕK¯¯¯¯¯∗0
(Journal of High Energy Physics, 2013, Vol. 2013, No.10 (Octubre), 2013-10-28)The first observation of the decay B0s→ϕK¯¯¯¯¯∗0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions at s√=7 TeV, collected with ... -
Measurement of CP observables in B 0 → DK ∗0 with D →K + K −
(Journal of High Energy Physics, 2013, Vol. 2013, No.3 (Març), 2013-03-12)The decay B 0 → DK *0 and the charge conjugate mode are studied using 1.0 fb−1 of pp collision data collected by the LHCb experiment at s√=7 TeV in 2011. The CP asymmetry between the B 0 → DK *0 and the ... -
Measurement of forward J/ψ production cross-sections in pp collisions at s√=13 TeV
(Journal of High Energy Physics, 2015, Vol. 2015, No.10 (Octubre), 2015-10-26)The production of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of s√=13 TeV is studied with the LHCb detector. Cross-section measurements are performed as a function of the transverse ... -
Measurement of J/ψ polarization in pp collisions at s√=7 TeV
(The European Physical Journal C, 2013, Vol. 73, no. 11 (Novembre), 2013-11-09)An angular analysis of the decay J/ψ→μ + μ − is performed to measure the polarization of prompt J/ψ mesons produced in pp collisions at s√=7 TeV. The dataset corresponds to an integrated luminosity of ... -
Measurement of J/ψ production in pp collisions at s√=2.76TeV
(Journal of High Energy Physics, 2013, Vol. 2013, No.2 (Febrer), 2013-02-07)The production of J/ψ mesons is studied with the LHCb detector using data from pp collisions at s√=2.76 TeV corresponding to an integrated luminosity of 71 nb−1. The differential cross-section for ... -
Measurement of sigma(pp -> b anti-b X) at sqrt(s)=7 TeV in the forward region
(Physics Letters B, Vol. 694, No. 3 (Novembre 2010), 2010)Decays of b hadrons into final states containing a Dº 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 ... -
Measurement of the B+c meson lifetime using B+c→J/ψμ+νμX decays
(The European Physical Journal C, 2014, Vol. 74, no. 5 (Maig), 2014-05-01)The lifetime of the B+c meson is measured using semileptonic decays having a J/ψ meson and a muon in the final state. The data, corresponding to an integrated luminosity of 2 fb −1, are collected by the ... -
Measurement of the CKM angle γ from a combination of B±→Dh± analyses
(Physics Letters B, 2013, Vol. 726, No. 1-3, (Octubre 2013), 2013-10-07)A combination of three LHCb measurements of the CKM angle gamma is presented. The decays B-+/- -> DK +/- and B-+/- -> D pi(+/-) are used, where D denotes an admixture of D-0 and (D) over bar (0) mesons, ... -
Measurement of the cross-section ratio σ(χc2)/σ(χc1) for prompt χc production at √s=7TeV
(Physics Letters, 2012, Vol. 714, No. 2-5 (Agost), 2012-08-14)The prompt production of the charmonium $\chi_{c1}$ and $\chi_{c2}$ mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The ... -
Measurement of the fraction of Υ (1S) originating from χb (1P) decays in pp collisions at√s= 7 TeV
(Journal of High Energy Physics, 2012, Vol. 2012, No. 11 (Novembre), 2012-11-08)The production of χb(1P ) mesons in pp collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb−1 of data collected with the LHCb detector. The χb(1P ) mesons are reconstructed in the decay ... -
Measurement of the fragmentation fraction ratio f s /f d and its dependence on B meson kinematics
(Journal of High Energy Physics, 2013, Vol. 2013, No.4 (Abril), 2013-04-02)The relative production rate of B0s and B 0 mesons is determined with the hadronic decays B0s→D−sπ+ and B 0 → D − K +. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass ... -
Measurement of the inclusive phi cross-section in pp collisions at sqrt(s) = 7 TeV.
(Physics Letters B, Vol. 703, No. 3 (Setembre 2011), 2011-07)The cross-section for inclusive Φ meson production in pp collisions at a centre-of-mass energy of s=7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section ... -
Measurement of the lifetime of the Bc+ meson using the Bc+→ J/ψπ+ decay mode
(Physics Letters B , 2015, Vol. 742, (Març), 2015-03-06)The difference in total widths between the Bc+ and B+mesons is measured using a data sample corresponding to an integrated luminosity of 3.0 fb-1collected by the LHCb experiment in 7 and 8 TeV centre-of-mass ...