Listando Articles publicats en revistes por materia "Física--Mesuraments"
Mostrando ítems 1-17 de 17
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First observation of the decay B¯0s→D0K∗0 and a measurement of the ratio of branching fractions B(B¯0s→D0K∗0)/B(B¯0→D0ρ0)
(Physics Letters B, Vol. 706, No. 1 (Novembre 2011), 2011-11-30)The first observation of the decay B¯s0→D0K⁎0 using pp data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb−1 , is reported. A ... -
Measurement of the B0s→J/ψK0S branching fraction
(Physics Letters B, 2012, Vol. 713, No. 3, (Juliol), 2012-07-09)The B0s→J/ψK0S branching fraction is measured in a data sample corresponding to 0.41 fb−1 of integrated luminosity collected with the LHCb detector at the LHC. This channel is sensitive tothe penguin ... -
Measurement of the B0s−B¯0s oscillation frequency Δms in B0s→D−s(3)π decays
(Physics Letters B, 2012-03-19)The B0s–B0soscillation frequency msis measured with 36 pb−1of data collected inppcollisions at √s=7 TeV by the LHCb experiment at the Large Hadron Collider. A total of 1381B0s→D−sπ+andB0s→D−sπ+π−π+signal ... -
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 CP-violating phase φs in B0s→J/ψπ+π− decays
(Physics Letters B, 2012, Vol. 713, No. 4-5 (Juliol), 2012-07-18)Measurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ ... -
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 D+s − D−s production asymmetry in 7 TeV pp collisions
(Physics Letters B, 2012, Vol. 713, No. 3, (Juliol), 2012-07-09)Heavy quark production in 7 TeV centre-of-mass energy pp collisions at the LHC is not necessarily flavour symmetric. The production asymmetry, A_P, between Ds+ and Ds- mesons is studied using the ... -
Measurement of the differential branching fraction of the decay Λ0b → Λμ+ μ−
(Physics Letters B, 2013, Vol. 725, No. 1-3 (Agost 2013), 2013-06)The differential branching fraction of the decay $\Lambda_b^0\rightarrow\Lambda\mu^+\mu^-$ is measured as a function of the square of the dimuon invariant mass, $q^2$. A yield of $78\pm12$ $\Lambda_b^ ... -
Measurement of the D± production asymmetry in 7 TeV pp collisions
(Physics Letters B, 2013, Vol. 718, No. 3 (Gener 2013), 2013-01-08)The asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T ... -
Measurement of the effective B0s → K+K- lifetime
(Physics Letters B, Vol. 716, No. 3-5, (Octubre 2012), 2012-10-02)A precise determination of the effectiveB0s→K+K−lifetime can be used to con-strain contributions from physics beyond the Standard Model in theB0smesonsystem. Conventional approaches selectBmeson ... -
Measurement of the polarization amplitudes and triple product asymmetries in the B s 0 → ϕ ϕ decay
(Physics Letters B, 2012, Vo. 713, No. 4-5 (Juliol 2012), 2012-07-18)Using 1.0 fb^{-1} of pp collision data collected at a centre-of-mass energy of sqrt{s}=7 TeV with the LHCb detector, measurements of the polarization amplitudes, strong phase difference and triple product ... -
Measurement of the time-dependent CP asymmetry in B0 → J/ψ K0S decays
(Physics Letters B, Vol. 721, No. 1-3 (Abril 2013), 2013-04-10)This Letter reports a measurement of the CP violation observables S J/ψK0S and C J/ψK0S in the decay channel B0 → J/ψ K0S performed with 1.0 fb-1 of pp collisions at √s = 7 TeV collected by the LHCb ... -
Observation of CP violation in B ± → D K ± decays
(Physics Letters B, 2012, Vol. 712, No. 3 (Juny), 2012-06-06)An analysis of B+ to DK+ and B+ to Dpi+ decays is presented where the D meson is reconstructed in the two-body final states: K+pi-, K+K-, pi+pi- and pi+K-. Using 1.0 fb-1 of LHCb data, measurements of ... -
Observation of the decay B0s→D0φ
(Physics Letters B, 2013, Vol. 727, No. 4-5 (Desembre 2013), 2013-12)First observation of the decayB0s→D0φis reported usingppcollision data, corresponding to an inte-grated luminosity of 1.0 fb−1, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. ... -
Prompt Kshort production in pp collisions at sqrt(s)=0.9 TeV
(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 ... -
Search for the rare decays B0s → μ+ μ− and B0 → μ+ μ-
(Physics Letters B, Vol. 708, No, 1-2 (Febrer 2012), 2011-02-14)A search for the decaysB0s→μ+μ−andB0→μ+μ−is performed with 0.37 fb−1ofppcollisions at√s=7 TeV collected by the LHCb experiment in 2011. The upper limits on the branching fractions areB(B0s→μ+μ−)<1.6×1 ... -
Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb
(Physics Letters B , 2013, Vol. 724, No. 1-3 (Juliol, 2013), 2013-07-09)Searches for the lepton flavour violating decay $\tau^-\rightarrow \mu^-\mu^+\mu^-$ and the lepton flavour and baryon number violating decays $\tau^-\rightarrow \bar{p}\mu^+\mu^-$ and $\tau^-\rightarrow ...