Publications
862 results found
Aaij R, Beteta CA, Ackernley T, et al., 2021, Angular analysis of B0→D-Ds+ with Ds+→Ds+γ decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abellan Beteta C, Ackernley T, et al., 2021, Measurement of the prompt-production cross-section ratio σ(χ<sub><i>c</i>2</sub>)/σ(χ<sub><i>c</i>1</sub>) in <i>p</i>Pb collisions at √<i>s<sub>NN</sub></i>=8.16 TeV, PHYSICAL REVIEW C, Vol: 103, ISSN: 2469-9985
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- Citations: 3
Aaij R, Beteta CA, Ackernley T, et al., 2021, Searches for 25 rare and forbidden decays of <i>D</i><SUP>+</SUP> and Ds+ mesons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 6
Aaij R, Beteta CA, Ackernley T, et al., 2021, Search for <i>CP</i> violation in <i>D</i><sub>(<i>s</i>)</sub><SUP>+</SUP> → <i>h</i><SUP>+</SUP> π<SUP>0</SUP> and decays <i>D</i><sub>(<i>s</i>)</sub><SUP>+</SUP> → <i>h</i><SUP>+</SUP> η decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 6
Aaij R, Abellán Beteta C, Ackernley T, et al., 2021, Angular analysis of <sup>B0</sup>→<sup>D∗−</sup>Ds∗+ with Ds∗+→Ds+γ decays, Journal of High Energy Physics, Vol: 2021
The first full angular analysis of the B0→D∗−Ds∗+ decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The Ds∗+→Ds+γ and D*− → D¯ π− vector meson decays are used with the subsequent Ds+ → K+K−π+ and D¯ → K+π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [ℬ(B0→D∗−Ds∗+) × ℬ(Ds∗+→Ds+γ)]/ℬ(B0 → D*−Ds+) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D*−Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(Bs → D*−Ds+)/ℬ(B0 → D*−Ds+) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions. [Figure not available: see fulltext.]
Aaij R, Abellán Beteta C, Ackernley T, et al., 2021, Searches for 25 rare and forbidden decays of D <sup>+</sup> and Ds+ mesons, Journal of High Energy Physics, Vol: 2021
A search is performed for rare and forbidden charm decays of the form D(s)+→h±ℓ+ℓ(′)∓, where h± is a pion or kaon and ℓ(′)± is an electron or muon. The measurements are performed using proton-proton collision data, corresponding to an integrated luminosity of 1.6 fb−1, collected by the LHCb experiment in 2016. No evidence is observed for the 25 decay modes that are investigated and 90 % confidence level limits on the branching fractions are set between 1.4 × 10−8 and 6.4 × 10−6. In most cases, these results represent an improvement on existing limits by one to two orders of magnitude. [Figure not available: see fulltext.]
Aaij R, Beteta CA, Adeva B, et al., 2021, Observation of the decay Λb0<i>→</i> χ<sub>c1</sub>pπ<SUP><i>-</i></SUP>, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abellán Beteta C, Ackernley T, et al., 2021, Observation of the decay Λb0 → χ<inf>c1</inf>pπ<sup>−</sup>, Journal of High Energy Physics, Vol: 2021
The Cabibbo-suppressed decay Λb0→ χc1pπ− is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λb0→ χc2pπ− decay is also found. Using the Λb0→ χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to beB(Λb0→χc1pπ−)B(Λb0→χc1pK−)=(6.59±1.01±0.22)×10−2,B(Λb0→χc2pπ−)B(Λb0→χc1pπ−)=0.95±0.30±0.04±0.04,B(Λb0→χc2pK−)B(Λb0→χc1pK−)=1.06±0.05±0.04±0.04, where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2→ J/ψγ decays. [Figure not available: see fulltext.]
Ahdida C, Akmete A, Albanese R, et al., 2021, Sensitivity of the SHiP experiment to dark photons decaying to a pair of charged particles, EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
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- Citations: 12
Aaij R, Beteta CA, Ackernley T, et al., 2021, Angular Analysis of the <i>B</i><SUP>+</SUP> → <i>K</i>*<SUP>+</SUP>μ<SUP>+</SUP> μ<SUP>-</SUP> Decay, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
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- Citations: 36
Ahdida C, Akmete A, Albanese R, et al., 2021, Sensitivity of the SHiP experiment to light dark matter, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 11
Aaij R, Beteta CA, Adeva B, et al., 2021, Study of B<sub>s</sub><SUP>0</SUP> → J<i>/</i>ψπ<SUP>+</SUP>π<i><SUP>-</SUP></i>K<SUP>+</SUP>K<i><SUP>-</SUP></i> decays (vol 2, 024, 2021), JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abellán Beteta C, Ackernley T, et al., 2021, Observation of the Λ<inf>b</inf><sup>0</sup>→Λ<inf>c</inf><sup>+</sup>K<sup>+</sup>K<sup>−</sup>π<sup>−</sup> decay, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 815, ISSN: 0370-2693
The Λb0→Λc+K+K−π− decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of s=7 and 8TeV collected by the LHCb detector, corresponding to an integrated luminosity of 3fb−1. The ratio of branching fractions between the Λb0→Λc+K+K−π− and the Λb0→Λc+Ds− decays is measured to be [Formula presented] where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the Ds−→K+K−π− branching fraction. No structure on the invariant mass distribution of the Λc+K+ system is found, consistent with no open-charm pentaquark signature.
Aaij R, Beteta CA, Ackernley T, et al., 2021, Observation of the Λ<SUP>0</SUP><i><sub>b</sub></i> → Λ<SUP>+</SUP><i><sub>c</sub>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP>π<SUP>-</SUP> decay, PHYSICS LETTERS B, Vol: 815, ISSN: 0370-2693
Aaij R, Beteta CA, Ackernley T, et al., 2021, Measurement of CP observables in B<SUP>±</SUP> → D<SUP>(</SUP>*<SUP>)</SUP>K<SUP>±</SUP> and B<SUP>±</SUP> → D<SUP>(</SUP>*<SUP>)</SUP>π<SUP>±</SUP> decays using two-body D final states, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 5
Aaij R, Beteta CA, Adeva B, et al., 2021, Search for the rare decay B-0 -> J/psi phi, Chinese Physics C, Vol: 45, Pages: 1-14, ISSN: 0254-3052
A search for the rare decay $ B^0\to J/ \psi\phi$ is performed using $ pp$ collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. No significant signal of the decay is observed and an upper limit of $ 1.1 \times 10^{-7}$ at 90% confidence level is set on the branching fraction.
Aaij R, Beteta CA, Ackernley T, et al., 2021, Measurement of the branching fraction of the B0→Ds+π- decay, EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
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- Citations: 4
Aaij R, Beteta CA, Ackernley T, et al., 2021, Observation of a New Excited <i>D<sub>s</sub></i><SUP>+</SUP> Meson in <i>B</i><SUP>0</SUP> → <i>D</i><SUP>-</SUP> <i>D</i><SUP>+</SUP> <i>K</i><SUP>+</SUP> π<SUP>-</SUP> Decays, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
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- Citations: 14
Aaij R, Beteta CA, Ackernley T, et al., 2021, Search for long-lived particles decaying to <i>e</i><SUP>±</SUP>μ<SUP>∓</SUP>ν, EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
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- Citations: 9
Aaij R, Beteta CA, Adeva B, et al., 2021, Measurement of the CKM angle γ and Bs0-B<overbar></mml:mover>s0 mixing frequency with Bs0→Ds∓h±π±π<mml:mo>∓ decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 3
Aaij R, Beteta CA, Adeva B, et al., 2021, Observation of the Bs0 → <i>D</i><SUP>*±</SUP><i>D</i><SUP>∓</SUP> decay, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 1
Aaij R, Beteta CA, Adeva B, et al., 2021, Observation of <i>CP</i> violation in two-body B<sub>(<i>s</i>)</sub><SUP>0</SUP>-meson decays to charged pions and kaons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 9
Aaij R, Beteta CA, Ackernley T, et al., 2021, Observation of Multiplicity Dependent Prompt <i>χ</i><sub>c1</sub> (3872) and ψ (2<i>S</i>) Production in pp Collisions, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
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- Citations: 19
Aaij R, Beteta CA, Ackernley T, et al., 2021, Measurement of <i>CP</i> Violation in the Decay <i>B</i> plus → <i>K</i><SUP>+</SUP> π<SUP>0</SUP>, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
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- Citations: 4
Amhis Y, Banerjee S, Ben-Haim E, et al., 2021, Averages of <i>b</i>-hadron, <i>c</i>-hadron, and τ-lepton properties as of 2018 Heavy Flavor Averaging Group (HFLAV), EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
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- Citations: 169
Aaij R, Beteta CA, Adeva B, et al., 2021, Search for heavy neutral leptons in W plus . μ plus μ± jet decays, EUROPEAN PHYSICAL JOURNAL C, Vol: 81, ISSN: 1434-6044
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- Citations: 16
Aaij R, Abellán Beteta C, Ackernley T, et al., 2021, First Observation of the Decay B_{s}^{0}→K^{-}μ^{+}ν_{μ} and a Measurement of |V_{ub}|/|V_{cb}|., Phys Rev Lett, Vol: 126
The first observation of the suppressed semileptonic B_{s}^{0}→K^{-}μ^{+}ν_{μ} decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 fb^{-1}, the branching fraction B(B_{s}^{0}→K^{-}μ^{+}ν_{μ}) is measured to be [1.06±0.05(stat)±0.08(syst)]×10^{-4}, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay B_{s}^{0}→D_{s}^{-}μ^{+}ν_{μ}, where D_{s}^{-} is reconstructed in the final state K^{+}K^{-}π^{-}, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the B_{s}^{0}→K^{-} and B_{s}^{0}→D_{s}^{-} transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |V_{ub}|/|V_{cb}| at low and high B_{s}^{0}→K^{-} momentum transfer.
Aaij R, Beteta CA, Ackernley T, et al., 2021, First Observation of the Decay <i>B<sub>s</sub></i><SUP>0</SUP> → <i>K</i><SUP>-</SUP>μ<SUP>+</SUP>ν<sub>μ</sub> and a Measurement of |<i>V<sub>ub</sub></i>|/|<i>V<sub>cb</sub></i>|, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
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- Citations: 18
Aaij R, Beteta CA, Adeva B, et al., 2021, Measurement of the CKM angle γ in <i>B</i><SUP>±</SUP> → <i>DK</i><SUP>±</SUP> and <i>B</i><SUP>±</SUP> → <i>Dπ</i><SUP>±</SUP> decays with <i>D</i> → <i>K</i><sub>S</sub><SUP>0</SUP><i>h</i><SUP>+</SUP><i>h<SUP>-</SUP></i>, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 5
Aaij R, Beteta CA, Ackernley T, et al., 2021, Study of B<sub>s</sub><SUP>0</SUP> → J/ψπ<SUP>+</SUP>π<SUP>-</SUP>K<SUP>+</SUP>K<SUP>-</SUP> decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 9
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