Browsing Articles publicats en revistes by Title
Now showing items 254-273 of 538
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Measurement of the branching fraction ratio B(B+c → ψ(2S)π+)/B(B+c → J/ψπ+)
(Physical Review D, 2015, Vol. 92, No. 7 (Octubre), 2015-10-20)Using pp collision data collected by LHCb at center-of-mass energies √s=7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb−1, the ratio of the branching fraction of the B+c→ψ(2S)π+ ... -
Measurement of the branching fractions of the decays B0s→¯¯¯D0K−π+ and B0→¯¯¯D0K+π−
(Physical Review D, 2013, Vol. 87 , No.11 (Juny), 2013-06-20)The first observation of the decay B0s→¯¯¯D0K−π+ is reported. The analysis is based on a data sample, corresponding to an integrated luminosity of 1.0 fb−1 of pp collisions, collected with the LHCb ... -
Measurement of the B¯0−B0 and B¯0s−B0s production asymmetries in pp collisions at s√=7 TeV
(Physics Letters B , 2014, Vol. 739 (Desembre), 2014-12-12)The B¯0−B0 and B¯0s−B0s production asymmetries, AP(B0) and AP(B0s), are measured by means of a time-dependent analysis of B0→J/ψK∗0, B0→D−π+ and B0s→D−sπ+ decays, using a data sample corresponding to ... -
Measurement of the charge asymmetry in B±→ϕK±B±→ϕK± and search for B±→ϕπ±B±→ϕπ± decays
(Physics Letters B , 2014, Vol. 728, (Gener), 2014-01-20)The CP-violating charge asymmetry in B±→ϕK±B±→ϕK± decays is measured in a sample of pp collisions at 7 TeV centre-of-mass energy, corresponding to an integrated luminosity of 1.0 fb−1 collected by the ... -
Measurement of the CKM angle γ and B0s-B¯¯¯¯0s mixing frequency with B0s→D∓sh±π±π∓ decays
(Journal of High Energy Physics, 2021, Vol.3, No. 137, 2021-03)The CKM angle γ is measured for the first time from mixing-induced CP violation between B0s→D∓sK±π±π∓ and B¯¯¯¯0s→D±sK∓π∓π± decays reconstructed in proton-proton collision data corresponding to an ... -
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 CKM angle γ using B ± → DK ± with D → K 0 S π + π −, K 0 S K + K − decays
(Journal of High Energy Physics, 2014, Vol. 2014, No.10 (Octubre), 2014-10-16)A binned Dalitz plot analysis of B ± → DK ± decays, with D→K0Sπ+π− and D→K0SK+K−, is performed to measure the CP-violating observables x ± and y ±, which are sensitive to the Cabibbo-Kobayashi-Maskawa ... -
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 ... -
Measurement of the CP-violating phase β in B0 → J/ψ π+ π− decays and límits on penguin effects
(Physics Letters B , 2015, Vol. 742, (Març), 2015-03-06)Time-dependent CPviolation is measured in the (—)B0→J/ψπ+π−channel for each π+π−resonant final state using data collected with an integrated luminosity of 3.0fb−1in ppcollisions using the LHCb detector. ... -
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 CP-violating phase φsin B0s→J/ψπ+π−decays
(Physics Letters B, 2014, Vol. 736, 2014-09)The mixing-induced CP-violating phase in and decays is measured using the final state in data, taken from 3 fb−1 of integrated luminosity, collected with the LHCb detector in 7 and 8 TeV centre-of-mass ... -
Measurement of the cross-section for Z → e+e- production in pp collisions at s√=7 TeV
(Journal of High Energy Physics, 2013, Vol. 2013, No.2 (Febrer), 2013-02-19)A measurement of the cross-section for pp → Z → e+e− is presented using data at s√=7 TeV corresponding to an integrated luminosity of 0.94 fb−1. The process is measured within the kinematic acceptance ... -
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 effective B0s→J/ψK0S lifetime
(Nuclear Physics B, 2013, Vol. 873, No. 2, 2013-08)This paper reports the first measurement of the effective B0s→J/ψK0S lifetime and an updated mea-surement of its time-integrated branching fraction. Both measurements are performed with a data sample, ... -
Measurement of the exclusive Υ production cross-section in pp collisions at s√=7 TeV and 8 TeV
(Journal of High Energy Physics, 2015, Vol. 2015, No.9 (Setembre), 2015-09-14)A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ + μ − final state, using pp collision data recorded by the LHCb experiment. The cross-section ... -
Measurement of the flavour-specific CP-violating asymmetry assl in B0s decays
(Physics Letters B , 2014, Vol. 728, (Gener), 2014-01-20)The CP-violating asymmetry a_{sl}^s is studied using semileptonic decays of Bs and anti-Bs mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiting a data sample ...