This erratum corrects measurements of the prompt and secondary (from-b).

The angular distribution of the dimuon system of the decays.

The production of $t\overline{t}$, $W+b\overline{b}$ and $W+c\overline{c}$ is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 $\mbox{fb}^{-1}$. The $W$ bosons are reconstructed in the decays $W\rightarrow\ell\nu$, where $\ell$ denotes muon or electron, while the $b$ and $c$ quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions.

Measurements of the cross section for producing b quarks in the reaction pp→bb[over ¯]X are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity η in the range 2<η<5 covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of b-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross sections in the covered η range are 72.0±0.3±6.8 and 154.3±1.5±14.3  μb for 7 and 13 TeV. The ratio is 2.14±0.02±0.13, where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7 TeV, but differs somewhat at 13 TeV. The measured ratio of cross sections is larger at lower η than the model prediction.

Received 3 November 2017DOI:https://doi.org/10.1103/PhysRevD.96.099907Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2017 CERN, for the LHCb CollaborationPhysics Subject Headings (PhySH)TechniquesParticle mixing & oscillationsParticles & Fields

A search is made for the highly-suppressed B meson decays B^+→ K^+K^+π^- and B^+→π^+π^+K^- using a data sample corresponding to an integrated luminosity of 3.0 fb^-1 collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. No evidence is found for the decays, and upper limits at 90% confidence level are determined to be ℬ(B^+→ K^+K^+π^-) < 1.1× 10^-8 and ℬ(B^+→π^+π^+K^-) < 4.6× 10^-8.

The first observation of the decay ηc(2S)→pp¯ is reported using proton–proton collision data corresponding to an integrated luminosity of 3.0 fb−1 recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ηc(2S) resonance is produced in the decay B+→[cc¯]K+. The product of branching fractions normalised to that for the J/ψ intermediate state, Rηc(2S), is measured to be Rηc(2S)≡B(B+→ηc(2S)K+)×B(ηc(2S)→pp¯)B(B+→J/ψK+)×B(J/ψ→pp¯)=(1.58±0.33±0.09)×10−2, where the first uncertainty is statistical and the second systematic. No signals for the decays B+→X(3872)(→pp¯)K+ and B+→ψ(3770)(→pp¯)K+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be RX(3872)<0.25×10−2 and Rψ(3770)<0.10. In addition, the mass differences between the ηc(1S) and the J/ψ states, between the ηc(2S) and the ψ(2S) states, and the natural width of the ηc(1S) are measured as MJ/ψ−Mηc(1S)=110.2±0.5±0.9 MeV,Mψ(2S)−Mηc(2S)=52.5±1.7±0.6 MeV,Γηc(1S)=34.0±1.9±1.3 MeV.

A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 1 and 2\(\,\hbox {fb}^{-1}\), respectively. The analysis is performed assuming a set of production mechanisms with simple topologies, including the production of a Higgs-like particle decaying into two long-lived particles. The mass range from 20 to 80 \(\mathrm{{GeV}}/c^2\) and lifetimes from 5 to 100\({\,\mathrm{{ps}}}\) are explored. Results are also interpreted in terms of neutralino production in different R-Parity violating supersymmetric models, with masses in the 23–198 GeV/\(c^2\) range. No excess above the background expectation is observed and upper limits are set on the production cross-section for various points in the parameter space of theoretical models.

Two new algorithms for use in the analysis of pp collision are developed to identify the flavour of B0 mesons at production using pions and protons from the hadronization process. The algorithms are optimized and calibrated on data, using B0 → D−π+ decays from pp collision data collected by LHCb at centre-of-mass energies of 7 and 8 TeV . The tagging power of the new pion algorithm is 60% greater than the previously available one; the algorithm using protons to identify the flavour of a B0 meson is the first of its kind.

The first observation of the decay eta(c)(2S) -> p (p) over bar is reported using proton -proton collision data corresponding to an integrated luminosity of 3.0 fb(-1) recorded by the LHCb experiment at centre -of -mass energies of 7 and 8 TeV. The eta c(2S) resonance is produced in the decay B+ [c (c) over bar ]K+. The product of branching fractions normalised to that for the intermediate state, R-eta c,(2s), is measured to beR-eta c,(2s) equivalent to B(B+-> eta c (2S)K+) x B(eta c(2s)(2S) -> p<<(p)over bar> )/B(B+ -> J/psi k(+)) x B(J/psi -> p<<(p)over bar> ) = (1.58 +/- 0.33 +/- 0.09) x 10(-2),where the first uncertainty is statistical and the second systematic. No signals for the decays B+ -> X(3872)(-> p (p) over bar )K+ and B+ psi(3770)(-> p (p) over bar )K+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be R-x(3872) < 0.25 x 10(-2) and R-psi(3770) < 0.10. In addition, the mass differences between the nc(1S) and the J/psi states, between the eta(c)(2S) and the eta(c)(2S) states, and the natural width of the psi(1S) are measured asM-J/psi - M-eta c(7s)= 110.2 +/- 0.5 +/- 0.9 MeV,M psi(2S) - M-eta c (2S) = 52.5 +/- 1.7 +/- 0.6MeV, Gamma(eta c) (1s) = 34.0 +/- 1.9 +/- 1.3 MeV.(C) 2017 Published by Elsevier B.V.

The resonant substructure of D 0 → π+π−π+π− decays is studied using data collected by the CLEO-c detector. An amplitude analysis is performed in order to disentangle the various intermediate state contributions. To limit the model complexity a data driven regularization procedure is applied. The prominent contributions are the decay modes D 0 → a 1(1260)+ π−, D 0 → σ f 0(1370) and D 0 → ρ(770)0 ρ(770)0. The broad resonances a 1(1260)+, π(1300)+ and a 1(1640)+ are studied in detail, including quasi-modelindependent parametrizations of their lineshapes. The mass and width of the a 1(1260)+ meson are determined to be m a1(1260)+ = [1225 ± 9 (stat) ± 17 (syst) ± 10 (model)] MeV/c 2 and Γa1(1260)+ = [430 ± 24 (stat) ± 25 (syst) ± 18 (model)] MeV. The amplitude model of D 0 → K + K −π+π− decays obtained from CLEO II.V, CLEO III, and CLEO-c data is revisited with improved lineshape parametrizations. The largest components are the decay modes D 0 → ϕ(1020)ρ(770)0, D 0 → K 1(1270)+ K − and D 0 → K(1400)+ K −.

A search for the CP-violating strong decays η→π+π− and η′(958)→π+π− has been performed using approximately 2.5×107 events of each of the decays D+→π+π+π− and Ds+→π+π+π−, recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0 fb−1 of pp collision data recorded during LHC Run 1 and 0.3 fb−1 recorded in Run 2. No evidence is seen for D(s)+→π+η(′) with η(′)→π+π−, and upper limits at 90% confidence level are set on the branching fractions, B(η→π+π−)<1.6×10−5 and B(η′→π+π−)<1.8×10−5. The limit for the η decay is comparable with the existing one, while that for the η′ is a factor of three smaller than the previous limit.

The suppressed decay Lambda(0)(b) -u003e p pi(-) mu(+) mu(-), excluding the J/psi and psi(2S) -u003e mu(+) mu(-) resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton- proton collision data corresponding to an integrated luminosity of 3 fb(-1) collected with the LHCb experiment. The Lambda(0)(b) -u003e p pi(-) mu(+) mu(-) branching fraction is measured relative to the Lambda(0)(b) -u003e J/psi (-u003e mu(+) mu(-)) p pi(-) branching fraction giving B (Lambda(0)(b) -u003e p pi(-) mu(+) mu(-))/B(Lambda(0)(b) -u003e J/psi (-u003e mu(+) mu(-)) p pi(-)) = 0.044 +/- 0.012 +/- 0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b -u003e d transition in a baryonic decay

The resonant substructure of D-0 -> pi(+)pi pi(+)pi(-) decays is studied using data collected by the CLEO-c detector. An amplitude analysis is performed in order to disentangle the various intermediate state contributions. To limit the model complexity a data driven regularization procedure is applied. The prominent contributions are the decay modes D-0 -> a(1)(1260)(+) pi(-), D-0 -> sigma f(0) (1370) and D-0 -> rho(770)(0) rho(770)(0). The broad resonances a(1) (1260)(+), pi (1300)(+) and a(1) (1640)(+) are studied in detail, including quasi-model-independent parametrizations of their lineshapes. The mass and width of the a(1) (1260)(+) meson are determined to be m(a1) ((1260)+) = [1225 +/- 9 (stat) +/- 17 (syst) +/- 10 (model)] MeV/c(2) and Gamma(a1) ((1260)+) = [430 +/- 24 (stat) +/- 25 (syst) +/- 18 (model)] MeV. The amplitude model of D-0 -> K+ K-pi(+)pi(-) decays obtained from CLEO II.V, CLEO III, and CLEO-c data is revisited with improved lineshape parametrizations. The largest components are the decay modes D-0 -> phi(1020)rho(770)(0), D-0 -> K-1 (1270)(+) K- and D-0 -> K(1400)(+) K-.The fractional CP-even content of the decay D-0 -> pi(+)pi(-)pi(+)pi(-) is calculated from the amplitude model to be F-+(4 pi) = [72:9 +/- 0:9 (stat)+/- 1:5 (syst)+/- 1:0 (model)] %, consistent with that obtained from a previous model-independent measurement. For D-0 -> K+ K- pi(+)pi(-) decays, the CP-even fraction is measured for the first time and found to be F-+(K K pi pi) = [75.3 +/- 1.8 (stat) +/- 3.3 (syst) +/- 3.5 (model)] %.The global decay rate asymmetries between D-0 and (D) over bar (0) decays are measured to be A(CP)(4 pi) - [+0.54 +/- 1.04 (stat)+/- 0.51 (syst)]% and A(CP)(KK pi pi) - [+1.84 +/- 1.74 (stat)+/- 0.30 (syst)]%. A search for CP asymmetries in the amplitude components yields no evidence for CP violation in either decay mode.

Abstract Two new algorithms for use in the analysis of $$pp$$ p p collision are developed to identify the flavour of $${\mathrm {B}} ^0$$ B 0 mesons at production using pions and protons from the hadronization process. The algorithms are optimized and calibrated on data, using $${{\mathrm {B}} ^0} \!\rightarrow D^{-}\pi ^{+}$$ B 0 → D - π + decays from $$pp$$ p p collision data collected by LHCb at centre-of-mass energies of 7 and 8 TeV . The tagging power of the new pion algorithm is 60% greater than the previously available one; the algorithm using protons to identify the flavour of a $${\mathrm {B}} ^0$$ B 0 meson is the first of its kind.