Publications
1218 results found
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Search for massive long-lived particles decaying semileptonically at root s=13 TeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 82, ISSN: 1434-6044
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+}., Phys Rev Lett, Vol: 128
Two narrow resonant states are observed in the Λ_{b}^{0}K^{-}π^{+} mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb^{-1}. The minimal quark content of the Λ_{b}^{0}K^{-}π^{+} system indicates that these are excited Ξ_{b}^{0} baryons. The masses of the Ξ_{b}(6327)^{0} and Ξ_{b}(6333)^{0} states are m[Ξ_{b}(6327)^{0}]=6327.28_{-0.21}^{+0.23}±0.12±0.24 and m[Ξ_{b}(6333)^{0}]=6332.69_{-0.18}^{+0.17}±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41_{-0.27}^{+0.26}±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ_{b}^{0} mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξ_{b}(6327)^{0}]<2.20(2.56) and Γ[Ξ_{b}(6333)^{0}]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ_{b}^{0} resonances.
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, Observation of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mrow><mml:mo>*</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mrow><mml:mo>*</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> decays, Physical Review D, Vol: 105, ISSN: 2470-0010
Aaij R, Abellán Beteta C, Ackernley T, et al., 2022, Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at sqrt[s_{NN}]=5 TeV., Phys Rev Lett, Vol: 128
The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy sqrt[s_{NN}]=5 TeV is studied at LHCb as a function of pseudorapidity (η) and transverse momentum (p_{T}) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of η between -4.8<η<-2.5 (backward region) and 2.0<η<4.8 (forward region), and p_{T} between 0.2<p_{T}<8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p_{T} larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10^{-6}.
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of charmonium and charmonium-like contributions in B+ -> J/psi eta K+ decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Observation of Lambda b(0) -> D(+)p pi(-)pi(-) and Lambda b(0) -> D-*+p pi(-)pi(-) decays, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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 B-s(0) and B-0 decays into four muons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Beteta CA, Ackernley T, et al., 2022, J/psi photoproduction in Pb-Pb peripheral collisions at root S-NN=5 TeV, PHYSICAL REVIEW C, Vol: 105, ISSN: 2469-9985
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: 1
Aaij R, Abdelmotteleb ASW, Abellán Beteta C, et al., 2022, Measurement of the photon polarization in Λb0 → Λγ decays, Physical Review D, Vol: 105, ISSN: 2470-0010
The photon polarization in b→sγ transitions is measured for the first time in radiative b-baryon decays exploiting the unique spin structure of Λb0→Λγ decays. A data sample corresponding to an integrated luminosity of 6 fb-1 collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be αγ=0.82-0.26-0.13+0.17+0.04, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.
LHCb Collaboration, 2022, Measurement of the lifetimes of promptly produced <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si22.svg"><mml:msubsup><mml:mi mathvariant="normal">Ω</mml:mi><mml:mi>c</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si23.svg"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Ξ</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math> baryons, Science Bulletin, Vol: 67, Pages: 479-487, ISSN: 2095-9273
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
Aaij R, ABdelmotteleb ASW, Beteta CA, et al., 2022, Evidence for a New Structure in the J/psi p and J/psi(p)over-bar Systems in B-s(0) -> J/psi p(p)over-bar Decays, PHYSICAL REVIEW LETTERS, Vol: 128, ISSN: 0031-9007
Aaij R, Abdelmotteleb ASW, Gallego FJA, et al., 2022, Identification of charm jets at LHCb, JOURNAL OF INSTRUMENTATION, Vol: 17, ISSN: 1748-0221
Aaij R, Beteta CA, Ackernley T, et al., 2022, Measurement of prompt charged-particle production in pp collisions at root s=13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 1
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: 2
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of chi(c1) (3872) production in proton-proton collisions at root s=8 and 13 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Search for the radiative Xi(-)(b) -> Xi(-)gamma decay, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Study of B-c(+) decays to charmonia and three light hadrons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2022, Measurement of the W boson mass, The Journal of High Energy Physics, Vol: 2022, Pages: 1-28, ISSN: 1029-8479
The W boson mass is measured using proton-proton collision data at s√ = 13 TeV corresponding to an integrated luminosity of 1.7 fb−1 recorded during 2016 by the LHCb experiment. With a simultaneous fit of the muon q/pT distribution of a sample of W → μν decays and the ϕ* distribution of a sample of Z → μμ decays the W boson mass is determined to bemw=80354±23stat±10exp±17theory±9PDFMeV,where uncertainties correspond to contributions from statistical, experimental systematic, theoretical and parton distribution function sources. This is an average of results based on three recent global parton distribution function sets. The measurement agrees well with the prediction of the global electroweak fit and with previous measurements.
Aaij R, Beteta CA, Ackernley T, et al., 2022, Precise determination of the B-s(0)-B-s(-0) oscillation frequency, NATURE PHYSICS, Vol: 18, Pages: 54-+, ISSN: 1745-2473
Aaij R, Beteta CA, Ackernley T, et al., 2022, Measurement of the B-s(0) -> mu(+)mu(-) decay properties and search for the B-0 -> mu(+)mu(-) and B-s(0) -> mu(+)mu(-) gamma decays, PHYSICAL REVIEW D, Vol: 105, ISSN: 2470-0010
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- Citations: 3
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Observation of the suppressed Lambda(0)(b) -> DpK(-) decay with D -> K+ pi(-) and measurement of its CP asymmetry, PHYSICAL REVIEW D, Vol: 104, ISSN: 2470-0010
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Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Simultaneous determination of CKM angle gamma and charm mixing parameters, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Updated search for B-c(+) decays to two charm mesons, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Search for the doubly charmed baryon Xi(+)(cc) in the Xi(+)(c)pi(-)pi(+) final state, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Measurement of J/psi production cross-sections in pp collisions at root s=5 TeV, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
Aaij R, Beteta CA, Ackernley T, et al., 2021, Observation of excited Omega(0)(c) baryons in Omega(-)(b) -> Xi(+)(c) K-pi(-) decays, PHYSICAL REVIEW D, Vol: 104, ISSN: 2470-0010
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Aaij R, Abdelmotteleb ASW, Beteta CA, et al., 2021, Angular analysis of the rare decay B-s(0) -> phi mu(+)mu(-), JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479
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- Citations: 1
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