Publications
1172 results found
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Angular Analysis of D0 →<i> x plus x-μ plus μ-</i> and D0 → K<i> plus K-μ plus μ-</i> Decays and Search for<i> CP</i> Violation, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 3
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of the charm mixing parameter <i>y<sub>CP</sub></i>-<i>y<sub>CP</sub></i><SUP><i>K</i>π</SUP> using two-body <i>D</i><SUP>0</SUP> meson decays, PHYSICAL REVIEW D, Vol: 105, ISSN: 2470-0010
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- Citations: 2
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of the Decay Λ<i><sub>b</sub></i><SUP>0</SUP> → Λ<i><sub>c</sub></i><SUP>+</SUP> τ<SUP>-</SUP>(ν)over-bar<sub>τ</sub>, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 12
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of the Decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}., Phys Rev Lett, Vol: 128
The first observation of the semileptonic b-baryon decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb^{-1} of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ^{-} lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}. The ratio of semileptonic branching fractions R(Λ_{c}^{+})≡B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}μ^{-}ν[over ¯]_{μ}) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λ_{b}^{0}→Λ_{c}^{+}μ^{-}ν[over ¯]_{μ} contributes to the last term. This result is in agreement with the standard model prediction.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Tests of Lepton Universality Using <i>B</i><SUP>0</SUP> → <i>K<sub>S</sub></i><SUP>0</SUP><i>l</i><SUP>+</SUP> <i>l</i><SUP>-</SUP> and <i>B</i><SUP>+</SUP> → <i>K</i>*<SUP>+</SUP><i>l</i><SUP>+</SUP><i>l</i><SUP>-</SUP> Decays, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 32
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2022, Search for the decay <i>B</i><SUP>0</SUP> → φμ<SUP>+</SUP> μ<SUP>-</SUP>, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 2
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2022, Observation of the doubly charmed baryon decay Ξ<i><sub>cc</sub></i><SUP>++</SUP> → Ξ<sub><i>c</i></sub>′<SUP>+</SUP>π<SUP>+</SUP>, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 10
Abudinén F, Blake T, Egede U, et al., 2022, Prospects for studies of D<sup>∗ 0</sup>→ μ<sup>+</sup>μ<sup>-</sup> and B(s)∗0→<sup>μ+</sup><sup>μ-</sup> decays, European Physical Journal C, Vol: 82, ISSN: 1434-6044
Weak decays of the vector D∗0 and B(s)∗0 mesons to the μ+μ- final state provide novel potential to test the Standard Model of particle physics. Such processes have extremely small branching fractions as the vector mesons are able to decay through electromagnetic and (for the D∗0 meson) strong interactions. Nonetheless, the production of copious quantities of these particles in LHC collisions, and the ability to exploit experimental techniques that can suppress background to low levels, provides good potential to reach interesting sensitivity. The possibility to reconstruct these processes as part of the decay chain of B- or Bc+ mesons appears particularly attractive due to the clean experimental signature of the displaced vertex. Indeed, published LHCb data on B-→ π-μ+μ- decays already implies a stringent limit on the branching fraction of D∗ 0→ μ+μ-. Estimates are made on the achievable sensitivity to D∗ 0→ μ+μ- and B(s)∗0→μ+μ- decays with the LHCb experiment.
Aaij R, Ackernley T, Adeva B, et al., 2022, Centrality determination in heavy-ion collisions with the LHCb detector, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221
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- Citations: 2
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Search for massive long-lived particles decaying semileptonically at √<i>s</i>=13 TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 82, ISSN: 1434-6044
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- Citations: 1
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of Two New Excited ?<SUP>0</SUP><sub>b</sub> States Decaying to ?<SUP>0</SUP><sub>b</sub>K -?<SUP>+</SUP>, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 5
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of the <i>B</i><SUP>0</SUP> → (<i>D</i>)over-bar*<SUP>0</SUP><i>K</i><SUP>+</SUP> π<SUP>-</SUP> and <i>B</i><sub>s</sub><SUP>0</SUP> → (<i>D</i>)over-bar*<SUP>0</SUP><i>K</i><SUP>-</SUP>π<SUP>+</SUP> decays, PHYSICAL REVIEW D, Vol: 105, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of charmonium and charmonium-like contributions in B<SUP>+</SUP> → J/ψηK<SUP>+</SUP> decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 1
Aaij R, Beteta CA, Ackernley T, et al., 2022, Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in <i>p</i>-Pb and <i>pp</i> Collisions at √<i>s</i><sub><i>NN</i> </sub>=5 TeV, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 6
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, Observation of the B0 → D ¯ ∗0K+π- and Bs0 → D ¯ ∗0K-π+ decays, Physical Review D, Vol: 105, ISSN: 2470-0010
The first observations of B0→D¯∗(2007)0K+π- and Bs0→D¯∗(2007)0K-π+ decays are presented, and their branching fractions relative to that of the B0→D¯∗(2007)0π+π- decay are reported. These modes can potentially be used to investigate the spectroscopy of charm and charm-strange resonances and to determine the angle γ of the Cabibbo-Kobayashi-Maskawa unitarity triangle. It is also important to understand them as a source of potential background in determinations of γ from B+→DK+ and B0→DK+π- decays. The analysis is based on a sample corresponding to an integrated luminosity of 5.4 fb-1 of proton-proton collision data at 13 TeV center-of-mass energy recorded with the LHCb detector. The D¯∗(2007)0 mesons are fully reconstructed in the D¯0π0 and D¯0γ channels with the D¯0→K+π- decay. A novel weighting method is used to subtract background while simultaneously applying an event-by-event efficiency correction to account for resonant structures in the decays.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of Λ<i><sub>b</sub></i><SUP>0</SUP> → <i>D</i><SUP>+</SUP><i>p</i>π<SUP>-</SUP>π<SUP>-</SUP> and Λ<i><sub>b</sub></i><SUP>0</SUP> → <i>D</i><sub>*</sub>+<i>p</i>π<SUP>-</SUP>π<SUP>-</SUP> decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of the photon polarization in Λ<sub><i>b</i></sub><SUP>0</SUP> → Λγ decays, PHYSICAL REVIEW D, Vol: 105, ISSN: 2470-0010
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- Citations: 3
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, Measurement of the photon polarization in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>γ</mml:mi></mml:math> decays, Physical Review D, Vol: 105, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Searches for rare <i>B<sub>s</sub></i><SUP>0</SUP> and <i>B</i><SUP>0</SUP> decays into four muons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 5
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of the lifetimes of promptly produced Ω<i><sub>c</sub></i><SUP>0</SUP> and Ξ<i><sub>c</sub></i><SUP>9</SUP> baryons, SCIENCE BULLETIN, Vol: 67, Pages: 479-487, ISSN: 2095-9273
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- Citations: 11
Aaij R, Beteta CA, Ackernley T, et al., 2022, <i>J</i>/ψ photoproduction in Pb-Pb peripheral collisions at √<i>S<sub>NN</sub></i>=5 TeV, PHYSICAL REVIEW C, Vol: 105, ISSN: 2469-9985
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- Citations: 5
Aaij R, Beteta CA, Ackernley T, et al., 2022, Test of lepton universality in beauty-quark decays, NATURE PHYSICS, Vol: 18, Pages: 277-+, ISSN: 1745-2473
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- Citations: 78
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of Z Bosons Produced in Association with Charm in the Forward Region, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 6
Aaij R, ABdelmotteleb ASW, Beteta CA, et al., 2022, Evidence for a New Structure in the <i>J/</i>ψ<i>p</i> and <i>J/</i>ψ(<i>p</i>)over-bar Systems in <i>B<sub>s</sub></i><SUP>0</SUP> → <i>J/</i>ψ<i>p</i>(<i>p</i>)over-bar Decays, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 23
Aaij R, Abdelmotteleb ASW, Gallego FJA, et al., 2022, Identification of charm jets at LHCb, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221
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- Citations: 2
Aaij R, Beteta CA, Ackernley T, et al., 2022, Measurement of prompt charged-particle production in pp collisions at √s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 8
Aaij R, Beteta CA, Ackernley T, et al., 2022, Analysis of Neutral B-Meson Decays into Two Muons, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
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- Citations: 33
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of χ<sub><i>c</i>1</sub> (3872) production in proton-proton collisions at √<i>s</i>=8 and 13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 6
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Search for the radiative Ξ<sub>b</sub><SUP>-</SUP> → Ξ<SUP>-</SUP>γ decay, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 3
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of B<SUP>+</SUP><sub>c</sub> decays to charmonia and three light hadrons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 2
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