Publications
862 results found
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Measurement of lepton universality parameters in B+ →k+ℓ+ℓ- and B0 →k∗0ℓ+ℓ- decays, Physical Review D, Vol: 108, ISSN: 2470-0010
A simultaneous analysis of the B+→K+ℓ+ℓ- and B0→K∗0ℓ+ℓ- decays is performed to test muon-electron universality in two ranges of the square of the dilepton invariant mass, q2. The measurement uses a sample of beauty meson decays produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb-1. A sequence of multivariate selections and strict particle identification requirements produce a higher signal purity and a better statistical sensitivity per unit luminosity than previous LHCb lepton universality tests using the same decay modes. Residual backgrounds due to misidentified hadronic decays are studied using data and included in the fit model. Each of the four lepton universality measurements reported is either the first in the given q2 interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Amplitude analysis of the ?<sub>c</sub><SUP>+</SUP>- pK-p<SUP>+</SUP> decay and ?<sub>c</sub><SUP>+</SUP> baryon polarization measurement in semileptonic beauty hadron decays, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, A study of <i>CP</i> violation in the decays <i>B</i><SUP>±</SUP> → [<i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP>π<SUP>+</SUP>π<SUP>-</SUP>]<i><sub>D</sub>h</i><SUP>±</SUP> (<i>h</i> = <i>K</i>, π) and <i>B</i><SUP>±</SUP> → [π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>+</SUP>π<SUP>-</SUP>]<i><sub>D</sub>h</i><SUP>±</SUP> (vol 83, 547, 2023), EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Search for the baryon- and lepton-number violating decays <i>B</i><SUP>0</SUP> → <i>p</i>μ<SUP>-</SUP> and <i>B<sub>s</sub></i><SUP>0</SUP> → <i>p</i>μ<SUP>-</SUP>, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Search for Rare Decays of D^{0} Mesons into Two Muons., Phys Rev Lett, Vol: 131
A search for the very rare D^{0}→μ^{+}μ^{-} decay is performed using data collected by the LHCb experiment in proton-proton collisions at sqrt[s]=7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb^{-1}. The search is optimized for D^{0} mesons from D^{*+}→D^{0}π^{+} decays but is also sensitive to D^{0} mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at B(D^{0}→μ^{+}μ^{-})<3.1×10^{-9} at a 90% C.L. This represents the world's most stringent limit, constraining models of physics beyond the standard model.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Observation of sizeable ? contribution to?<i>c1</i>(3872) ? p<i>+ p- J=?</i> decays, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Study of the B<SUP>-</SUP> → Λ<sub>c</sub><SUP>+</SUP>(Λ)over-bar<sub>c</sub><SUP>-</SUP><i>K</i><SUP>-</SUP> decay, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, First Observation of a Doubly Charged Tetraquark and Its Neutral Partner, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007
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- Citations: 1
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Search for D* (2007)<SUP>0</SUP> → μ<SUP>+</SUP> μ<SUP>-</SUP> in B<SUP>-</SUP> → π<SUP>-</SUP> μ<SUP>+</SUP> μ<SUP>-</SUP> decays, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, J/ψ and D<SUP>0</SUP> production in √s<sub>NN</sub>=68.5GeV PbNe collisions, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in <i>p</i>-Pb Collisions, PHYSICAL REVIEW LETTERS, Vol: 131, ISSN: 0031-9007
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Observation of a J/ψΛ Resonance Consistent with a Strange Pentaquark Candidate in B^{-}→J/ψΛp[over ¯] Decays., Phys Rev Lett, Vol: 131
An amplitude analysis of B^{-}→J/ψΛp[over ¯] decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb^{-1}. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4 MeV and 7.0±1.2±1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B^{-} mass to date, 5279.44±0.05±0.07 MeV, is obtained.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Charmonium production in <i>p</i>Ne collisions at √<SUP>s</SUP>NN=68.5 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Measurement of τL using the B<sub>s</sub><SUP>0</SUP> →J/ψη decay mode, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Search for the rare hadronic decay <i>B<sub>s</sub></i><SUP>0</SUP> → <i>p</i>(<i>p</i>)over-bar, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Direct <i>CP</i> violation in charmless three-body decays of <i>B</i><SUP>±</SUP> mesons, PHYSICAL REVIEW D, Vol: 108, ISSN: 2470-0010
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Test of lepton flavor universality using B0 →D∗-τ+ντ decays with hadronic τ channels, Physical Review D, Vol: 108, ISSN: 2470-0010
The branching fraction B(B0→D∗-τ+ντ) is measured relative to that of the normalization mode B0→D∗-π+π-π+ using hadronic τ+→π+π-π+(π0)ν¯τ decays in proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb-1. The measured ratio is B(B0→D∗-τ+ντ)/B(B0→D∗-π+π-π+)=1.70±0.10-0.10+0.11, where the first uncertainty is statistical and the second is related to systematic effects. Using established branching fractions for the B0→D∗-π+π-π+ and B0→D∗-μ+νμ modes, the lepton universality test R(D∗-)B(B0→D∗-τ+ντ)/B(B0→D∗-μ+νμ) is calculated, R(D∗-)=0.247±0.015±0.015±0.012, where the third uncertainty is due to the uncertainties on the external branching fractions. This result is consistent with the Standard Model prediction and with previous measurements.
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Amplitude analysis of B0 → D ¯ 0 Ds+ π- and B+ →D- Ds+ π+ decays, Physical Review D, Vol: 108, ISSN: 2470-0010
Resonant contributions in B0→D¯D0s+π- and B+→D-Ds+π+ decays are determined with an amplitude analysis, which is performed both separately and simultaneously, where in the latter case isospin symmetry between the decays is assumed. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV. The full data sample corresponds to an integrated luminosity of 9 fb-1. A doubly charged spin-0 open-charm tetraquark candidate together with a neutral partner, both with masses near 2.9 GeV, are observed in the Dsπ decay channel.
Aaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2023, Search for direct CP violation in charged charmless B →PV decays, Physical Review D, Vol: 108, ISSN: 2470-0010
Measurements of CP asymmetry in charmless B→PV decays are presented, where P and V denote a pseudoscalar and a vector meson, respectively. Five different B→PV decays from four final states, B±→π±π+π-, B±→K±π+π-, B±→K±K+K- and B±→π±K+K- are analyzed. The measurements are based on a method that does not require full amplitude analyses, and are performed using proton-proton collision data at a center-of-mass energy of 13 TeV collected by LHCb between 2015 and 2018, corresponding to an integrated luminosity of 5.9 fb-1. In the π+π- P-wave, in the region dominated by the B±→ρ(770)0K± decay, a CP asymmetry of ACP=+0.150±0.019±0.011 is measured, where the first uncertainty is statistical and the second is systematic. This is the first observation of CP violation in this process. For the other four decay channels, in regions dominated by the B±→ρ(770)0π±, B±→K(¯) ∗(892)0π±, B±→K(¯) ∗(892)0K± and B±→φ(1020)K± decays, CP asymmetries in the P-wave compatible with zero are measured.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Measurement of antiproton production from antihyperon decays in <i>p</i>He collisions at √<i>s</i><sub>NN</sub>=110 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, Open charm production and asymmetry in <i>p</i>Ne collisions at √<i>s</i><sub>NN</sub>=68.5 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 83, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2023, A study of CP violation in the decays <sup>B±</sup>→[<sup>K+</sup><sup>K-</sup><sup>π+</sup><sup>π-</sup>]D<sup>h±</sup> (h= K, π) and <sup>B±</sup>→[<sup>π+</sup><sup>π-</sup><sup>π+</sup><sup>π-</sup>]D<sup>h±</sup>, European Physical Journal C, Vol: 83, ISSN: 1434-6044
The first study of CP violation in the decay mode B±→[K+K-π+π-]Dh± , with h= K, π , is presented, exploiting a data sample of proton–proton collisions collected by the LHCb experiment that corresponds to an integrated luminosity of 9 \,fb - 1 . The analysis is performed in bins of phase space, which are optimised for sensitivity to local CP asymmetries. CP -violating observables that are sensitive to the angle γ of the Unitarity Triangle are determined. The analysis requires external information on charm-decay parameters, which are currently taken from an amplitude analysis of LHCb data, but can be updated in the future when direct measurements become available. Measurements are also performed of phase-space integrated observables for B±→[K+K-π+π-]Dh± and B±→[π+π-π+π-]Dh± decays.
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, First Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math> Angular Coefficients in the Forward Region of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> Collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math>, Physical Review Letters, Vol: 129, ISSN: 0031-9007
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, First Measurement of the <i>Z</i> → μ<SUP>+</SUP> μ<SUP>-</SUP> Angular Coefficients in the Forward Region of <i>pp</i> Collisions at √<i>s</i>=13 TeV, PHYSICAL REVIEW LETTERS, Vol: 129, ISSN: 0031-9007
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- Citations: 2
Calabrese R, Fiorini M, Luppi E, et al., 2022, Performance of the LHCb RICH detectors during LHC Run 2, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221
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- Citations: 2
Aaij R, Beteta CA, Ackernley T, et al., 2022, Study of coherent J/ψ production in lead-lead collisions at √S<sub>NN</sub>=5 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 7
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Constraints on the CKM angle γ from <i>B</i><SUP>±</SUP> → <i>Dh</i><SUP>±</SUP> decays using <i>D</i> → <i>h</i><SUP>±</SUP><i>h</i>′<SUP>∓</SUP>π<SUP>0</SUP> final states, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 1
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Precision measurement of forward Z boson production in proton-proton collisions at √s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 4
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of an exotic narrow doubly charmed tetraquark, NATURE PHYSICS, Vol: 18, Pages: 751-+, ISSN: 1745-2473
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- Citations: 61
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of the doubly charmed tetraquark T<sub>cc</sub><SUP>+</SUP>, NATURE COMMUNICATIONS, Vol: 13
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- Citations: 42
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