Accès ouvert
2025
article
OpenAlex
R. Aaij, Ahmed Sameh Wagih Abdelmotteleb, Carlos Abellán Beteta, F. Abudinén et autres
The Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}(→D^{+(0)}Λ)π^{-} decay chains are observed, and the spin-parity of Ξ_{c}(3055)^{+(0)} baryons is determined for the first time. The measurement is performed using proton-proton collision data at a center-of-mass energy of sqrt[s]=13 TeV, corresponding to an integrated luminosity of 5.4 fb^{-1}, recorded …
nl, gb, ch, us, es, se, fr, it, de, br, cn, pl, ie, hu, ua, co, ro, au
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Accès ouvert
2024
article
OpenAlex
R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén et autres
A bstract The differential branching fraction and angular coefficients of $$ {\Lambda}_b^0 $$ Λ b 0 → pK − μ + μ − decays are measured in bins of the dimuon mass squared and dihadron mass. The analysis is performed using a …
nl, gb, ch, us, es, se, fr, it, de, br, cn, pl
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Accès ouvert
2024
article
OpenAlex
R. Aaij, Ahmed Sameh Wagih Abdelmotteleb, Carlos Abellán Beteta, F. Abudinén et autres
A bstract The rare electromagnetic J/ψ → μ + μ − μ + μ − decay is observed with a significance greatly exceeding the discovery threshold, using proton-proton collision data collected by the LHCb experiment during 2016–2018 at a center-of-mass energy of …
nl, gb, ch, us, es, se, fr, it, de, br, cn, cz, pl
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Accès ouvert
2022
article
OpenAlex
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres
Abstract Coherent production ofJ/ψmesons is studied in ultraperipheral lead-lead collisions at a nucleon-nucleon centre-of-mass energy of 5 TeV, using a data sample collected by the LHCb experiment corresponding to an integrated luminosity of about 10 μb−1. TheJ/ψmesons are reconstructed in the dimuon …
ch, nl, gb, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2022
article
OpenAlex
R. Aaij, Ahmed Sameh Wagih Abdelmotteleb, Carlos Abellán Beteta, F. Abudinén et autres
Tests of lepton universality in B^{0}→K_{S}^{0}ℓ^{+}ℓ^{-} and B^{+}→K^{*+}ℓ^{+}ℓ^{-} decays where ℓ is either an electron or a muon are presented. The differential branching fractions of B^{0}→K_{S}^{0}e^{+}e^{-} and B^{+}→K^{*+}e^{+}e^{-} decays are measured in intervals of the dilepton invariant mass squared. The measurements are …
nl, gb, ch, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2022
article
OpenAlex
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres
The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy $\sqrt{{s}_{NN}}=5\text{ }\text{ }\mathrm{TeV}$ is studied at LHCb as a function of pseudorapidity ($\ensuremath{\eta}$) and transverse momentum (${p}_{T}$) with respect to the proton beam direction. …
nl, ch, gb, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2021
article
OpenAlex
R. Aaij, A. S. W. Abdelmotteleb, C. Abellán Beteta, T. Ackernley et autres
Abstract A search for the doubly charmed baryon $$ {\varXi}_{cc}^{+} $$ Ξcc+ is performed in the $$ {\varXi}_c^{+}{\pi}^{-}{\pi}^{+} $$ Ξc+π−π+ invariant-mass spectrum, where the $$ {\varXi}_c^{+} $$ Ξc+ baryon is reconstructed in thepK−π+final state. The study uses proton-proton collision data collected with …
nl, gb, ch, es, fr, us, it, de, ru, br, cn, pl
(code pays fourni par la source)
Accès ouvert
2020
article
OpenAlex
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres
Abstract: A structure is observed in the B±K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9fb-1. The structure is …
nl, ch, gb, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2020
article
OpenAlex
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres
The first observation of the decay ${B}^{0}\ensuremath{\rightarrow}{D}^{0}{\overline{D}}^{0}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is reported using proton-proton collision data corresponding to an integrated luminosity of $4.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is performed in the full kinematically allowed range …
nl, ch, gb, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2019
article
OpenAlex
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres
The production fraction of the ${B}_{c}^{\ensuremath{-}}$ meson with respect to the sum of ${B}^{\ensuremath{-}}$ and ${\overline{B}}^{0}$ mesons is measured in both 7 and 13 TeV center-of-mass (c.m.) energy $pp$ collisions produced by the Large Hadron Collider (LHC), using the LHCb detector. The …
nl, ch, gb, es, fr, us, it, de, ru, br, pl, cn
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Accès ouvert
2019
article
OpenAlex
R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres
Abstract A measurement of the time-dependent CP-violating asymmetry in $$ {B}_s^0\to \phi \phi $$ B s 0 → ϕϕ decays is presented. Using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.0 fb −1 collected by the LHCb …
nl, ch, es, gb, us, fr, it, de, ru, br, pl, cn
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
R. Aaij, Carlos Abellán Beteta, T. Ackernley, B. Adeva et autres
We report the observation of a new structure in the ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ spectrum using the full LHCb data set of $pp$ collisions, corresponding to an integrated luminosity of $9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected at $\sqrt{s}=7$, 8, and 13 TeV. A study of the structure …
nl, ch, gb, es, fr, us, it, de, ru, br, pl, cn
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