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

The production of the [Formula: see text] state in proton-proton collisions is probed via its decay to the [Formula: see text] final state with the LHCb detector, in the rapidity range [Formula: see text] and in the meson transverse-momentum range [Formula: see text]. The cross-section for prompt production of [Formula: see text] mesons relative to the prompt [Formula: see text] cross-section is measured, for the first time, to be [Formula: see text] at a centre-of-mass energy [Formula: see text] using data corresponding to an integrated luminosity of 0.7 fb[Formula: see text], and [Formula: see text] at [Formula: see text] using 2.0 fb[Formula: see text]. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the [Formula: see text] and [Formula: see text] decays to the [Formula: see text] final state. In addition, the inclusive branching fraction of [Formula: see text]-hadron decays into [Formula: see text] mesons is measured, for the first time, to be [Formula: see text], where the third uncertainty includes also the uncertainty on the [Formula: see text] inclusive branching fraction from [Formula: see text]-hadron decays. The difference between the [Formula: see text] and [Formula: see text] meson masses is determined to be [Formula: see text].

The production of the \(\eta _c (1S)\) state in proton-proton collisions is probed via its decay to the \(p\overline{p}\) final state with the LHCb detector, in the rapidity range \(2.0 < y < 4.5\) and in the meson transverse-momentum range \(p_\mathrm{T} > 6.5 \mathrm{{\,GeV/}{ c}} \). The cross-section for prompt production of \(\eta _c (1S)\) mesons relative to the prompt \({{ J}}/{\psi } \) cross-section is measured, for the first time, to be \(\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.74\, \pm \,0.29\, \pm \, 0.28\, \pm \,0.18 _{{\mathcal{B}}}\) at a centre-of-mass energy \({\sqrt{s}} = 7 {~\mathrm{TeV}}\) using data corresponding to an integrated luminosity of 0.7 fb\(^{-1}\), and \(\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.60 \pm 0.29 \pm 0.25 \pm 0.17 _{{\mathcal{B}}}\) at \({\sqrt{s}} = 8 {~\mathrm{TeV}}\) using 2.0 fb\(^{-1}\). The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the \(\eta _c (1S)\) and \({{ J}}/{\psi } \) decays to the \(p\overline{p}\) final state. In addition, the inclusive branching fraction of \({b} \)-hadron decays into \(\eta _c (1S)\) mesons is measured, for the first time, to be \({\mathcal{B}}( b {\rightarrow } \eta _c X ) = (4.88\, \pm \,0.64\, \pm \,0.29\, \pm \, 0.67 _{{\mathcal{B}}}) \times 10^{-3}\), where the third uncertainty includes also the uncertainty on the \({{ J}}/{\psi } \) inclusive branching fraction from \({b} \)-hadron decays. The difference between the \({{ J}}/{\psi } \) and \(\eta _c (1S)\) meson masses is determined to be \(114.7 \pm 1.5 \pm 0.1 {\mathrm {\,MeV\!/}c^2} \).

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 constraints to be placed on the angle gamma of the unitarity triangle and on the B-s(0) mixing phase -2 beta(s). Results from an extended approach, which uses additional inputs on B-0 -> pi(0)pi(0) and B+ -> pi(+)pi(0) decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value gamma =( 63.5(-6.7)(+7.2))degrees modulo 180 degrees is determined. In an alternative analysis, the value -2 beta(s)= - 0.12(-0.16)(+ 0.14) rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).

Citation for published version (Harvard): LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Bifani, S, Farley, N, Griffith, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L & Watson, NK 2015, 'Measurement of the semileptonic CP asymmetry in B 0 -B ̄ 0 mixing', Physical Review Letters, vol. 114, no. 4, 041601. https://doi.org/10.1103/PhysRevLett.114.041601

CF 4 is used as a Cherenkov gas radiator in one of the Ring Imaging Cherenkov detectors at the LHCb experiment at the CERN Large Hadron Collider.CF 4 is well known to have a high scintillation photon yield in the near and far VUV, UV and in the visible wavelength range.A large flux of scintillation photons in our photon detection acceptance between 200 and 800 nm could compromise the particle identification efficiency.We will show that this scintillation photon emission system can be effectively quenched, consistent with radiationless transitions, with no significant impact on the photons resulting from Cherenkov radiation.

The determination of track reconstruction efficiencies at LHCb using J/ψ→μ+μ- decays is presented. Efficiencies above 95% are found for the data taking periods in 2010, 2011, and 2012. The ratio of the track reconstruction efficiency of muons in data and simulation is compatible with unity and measured with an uncertainty of 0.8 % for data taking in 2010, and at a precision of 0.4 % for data taking in 2011 and 2012. For hadrons an additional 1.4 % uncertainty due to material interactions is assumed. This result is crucial for accurate cross section and branching fraction measurements in LHCb.

The decay $B^0\to \psi(2S) K^+\pi^-$ is analyzed using $\rm 3~fb^{-1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\psi(2S) \pi$ mass spectrum is obtained, using as input the $K\pi$ mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. The hypothesis that the $\psi(2S)\pi$ mass spectrum can be described in terms of $K\pi$ reflections alone is rejected with more than 8$\sigma$ significance. This provides confirmation, in a model-independent way, of the need for an additional resonant component in the mass region of the $Z(4430)^-$ exotic state.

The production of the η _c (1S) state in proton-proton collisions is probed via its decay to the pp final state with the LHCb detector, in the rapidity range 2.0 < y < 4.5 and in the meson transverse-momentum range p_T > 6.5 GeV/ c . The cross-section for prompt production of η _c (1S) mesons relative to the prompt J/ψ cross-section is measured, for the first time, to be σ _η _c (1S)/σ _ J/ψ = 1.74 ± 0.29 ± 0.28 ± 0.18 _ℬ at a centre-of-mass energy √(s) = 7 TeV using data corresponding to an integrated luminosity of 0.7 fb ^-1 , and σ _η _c (1S)/σ _ J/ψ = 1.60 ± 0.29 ± 0.25 ± 0.17 _ℬ at √(s) = 8 TeV using 2.0 fb ^-1 . The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the η _c (1S) and J/ψ decays to the pp final state. In addition, the inclusive branching fraction of b -hadron decays into η _c (1S) mesons is measured, for the first time, to be ℬ( b →η _c X ) = (4.88 ± 0.64 ± 0.29 ± 0.67 _ℬ) × 10^-3 , where the third uncertainty includes also the uncertainty on the J/ψ inclusive branching fraction from b -hadron decays. The difference between the J/ψ and η _c (1S) meson masses is determined to be 114.7 ± 1.5 ± 0.1 MeV/c^2 .

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Citation for published version (Harvard): LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Adrover, C, Affolder, A, Ajaltouni, Z, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Cartelle, PA, Alves, JA, Amato, S, Amerio, S, Amhis, Y, Anderlini, L, Anderson, J, Andreassen, R, Andrews, JE, Appleby, RB, Gutierrez, OA, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Bauer, T, Bifani, S, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2014, 'Measurement of the charge asymmetry in B ± K ± and search for B ±± decays', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 728, pp. 85-94. https://doi.org/10.1016/j.physletb.2013.11.036

Measurements of the effective lifetimes in the Bs0→K+K−, B0→K+π− and Bs0→π+K− decays are presented using 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of 7 TeV by the LHCb experiment. The analysis uses a data-driven approach to correct for the decay time acceptance. The measured effective lifetimes are τBs0→K+K−=1.407±0.016(stat)±0.007(syst) ps, τB0→K+π−=1.524±0.011(stat)±0.004(syst) ps, τBs0→π+K−=1.60±0.06(stat)±0.01(syst) ps. This is the most precise determination to date of the effective lifetime in the Bs0→K+K− decay and provides constraints on contributions from physics beyond the Standard Model to the Bs0 mixing phase and the width difference ΔΓs.

Structure of the decay ${\overline{B}}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is studied using data corresponding to $3\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity from $pp$ collisions produced by the LHC and collected by the LHCb detector. Five interfering ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ states are required to describe the decay: ${f}_{0}(980),{f}_{0}(1500),{f}_{0}(1790),{f}_{2}(1270)$, and ${f}_{2}^{\ensuremath{'}}(1525)$. An alternative model including these states and a nonresonant $J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely $CP$ odd. The $CP$-even part is found to be $<2.3%$ at a 95% confidence level. The ${f}_{0}(500)$ state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the ${f}_{0}(980)$ of $<7.{7}^{\ifmmode^\circ\else\textdegree\fi{}}$ at a 90% confidence level, consistent with a tetraquark interpretation of the ${f}_{0}(980)$ substructure.

The production of , and mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of collected in proton-proton collisions at a centre-of-mass energy of TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the transverse momentum and rapidity, over the ranges GeV/ and . The total cross-sections in this kinematic region, assuming unpolarised production, are measured to besigma (pp -> Upsilon(1S)X) x B(Upsilon(1S) -> mu(+)mu(-))= 1.111 +/- 0.043 +/- 0.044 nb,sigma (pp -> Upsilon(2S)X) x B(Upsilon(2S) -> mu(+)mu(-))= 0.264 +/- 0.023 +/- 0.011 nb,sigma (pp -> Upsilon(3S)X) x B(Upsilon(3S) -> mu(+)mu(-))s= 0.159 +/- 0.020 +/- 0.007 nb,where the first uncertainty is statistical and the second systematic.