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CERN Document Server 301 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 0.80 секунд. 
1.
Amplitude analysis of the $\Xi^+_c\to pK^-\pi^+$ decay and $\Xi^+_c$ baryon polarization measurement in semileptonic beauty-hadron decays / LHCb Collaboration
An amplitude analysis of the $\Xi^+_c\to pK^-\pi^+$ decay together with a measurement of the $\Xi^+_c$ polarization vector in semileptonic beauty-hadron decays is presented. [...]
arXiv:2508.00492 ; LHCb-PAPER-2024-034 ; CERN-EP-2024-320. - 2025 - 38.
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2.
Coherent photoproduction of $\rho^0, \omega$ and excited vector mesons in ultraperipheral PbPb collisions / LHCb Collaboration
The invariant-mass distribution for the coherent photoproduction of dipions in ultraperipheral PbPb collisions is measured using data, corresponding to an integrated luminosity of $ 224.6 \pm 9.6\ \mu$b$^{-1}$, collected by the LHCb experiment in 2018 at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{\rm NN}}=5.02$ TeV. [...]
arXiv:2506.06250 ; CERN-EP-2025-106 ; LHCB-PAPER-2024-042. - 2025 - 22.
Fulltext - Related data file(s) - 00005 Invariant-mass fits to data (left) in the region between 400 and 1200\mev, where the signal contribution is parametrised by Eq.~\ref{eq:sodh1}, and (right) in the full region, where the signal model is parametrised by Eq.~\ref{eq:best}, which includes two additional resonances and a phase for the nonresonant component. - 00004 Invariant-mass fits to data (left) in the region between 400 and 1200\mev, where the signal contribution is parametrised by Eq.~\ref{eq:sodh1}, and (right) in the full region, where the signal model is parametrised by Eq.~\ref{eq:best}, which includes two additional resonances and a phase for the nonresonant component. - 00000 Graphical representation of $\rho$-meson photoproduction in PbPb collisions. The shaded area depicts the interaction of the $\rho$ meson with the target. - 00007 Differential cross-section multiplied by the branching fraction to dipions, in bins of rapidity, for $\omega,\rho^\prime$ and $\rho^{\prime\prime}$ coherent photoproduction. The error bars represent the statistical uncertainty, while the bands correspond to the total uncertainty. - 00006 Differential cross-section for coherent $\rho$ photoproduction as a function of rapidity. The LHCb error bars represent the statistical and total uncertainties. The shaded band corresponds to the estimated uncertainty on the GKZ prediction. The contributions due to the photon emitted from each ion are labelled as $W^+$ and $W^-$ and are explained further in Sec.~\ref{sec:supp}. Also shown are ALICE results at central rapidity and the output of the \textsc{STARlight} generator. - 00003 Invariant-mass fits to data where the signal model includes a contribution for the $\omega$ resonance with the parametrisation of (left) Eq.~\ref{eq:sod2} and (right) Eq.~\ref{eq:sodh1}. - 00002 Invariant-mass fits to data where the signal model includes a contribution for the $\omega$ resonance with the parametrisation of (left) Eq.~\ref{eq:sod2} and (right) Eq.~\ref{eq:sodh1}. - 00009 Differential cross-section for the $\rho$ meson as a function of rapidity for data (left) compared to the impulse approximation, Glauber model, and Gribov--Glauber model and (right) with the estimated contributions from photoproduction on each ion in the Gribov--Glauber model after including nuclear suppression factors. The impulse approximation has been scaled down by a factor of two so it can be viewed with this axis-range. - 00001 Dipion invariant-mass distribution with the result of the fit superimposed, where the signal is modelled by the function in Eq.~\ref{eq:sod1}. The lower panel shows the normalised residuals. - Fulltext - 00008 Differential cross-section for the $\rho$ meson as a function of rapidity for data (left) compared to the impulse approximation, Glauber model, and Gribov--Glauber model and (right) with the estimated contributions from photoproduction on each ion in the Gribov--Glauber model after including nuclear suppression factors. The impulse approximation has been scaled down by a factor of two so it can be viewed with this axis-range.
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3.
Measurements of charmed meson and antimeson production asymmetries at $\sqrt{s} =13.6$ TeV / LHCb Collaboration
This article presents doubly differential measurements of the asymmetries in production rates between mesons containing a charm quark and those containing an anticharm quark in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13.6$ TeV using data recorded by the LHCb experiment. [...]
arXiv:2505.14494 ; LHCb-PAPER-2024-052 ; CERN-EP-2025-087 ; LHCB-PAPER-2024-052. - 2025 - 43.
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4.
Measurement of the branching fraction ratio $R_K$ at large dilepton invariant mass / LHCb Collaboration
A test of lepton universality between muons and electrons is performed using $B^+ \rightarrow K^+\ell^+\ell^-$ decays (where $\ell = e$, $\mu$), in the dilepton invariant-mass-squared region above 14.3 GeV$^2/c^4$. [...]
arXiv:2505.03483 ; LHCb-PAPER-2024-056 ; CERN-EP-2025-069. - 2025 - 37.
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5.
Observation of the doubly-charmed-baryon decay $\Xi_{cc}^{++} \to \Xi_c^0 \pi^+ \pi^+$ / LHCb Collaboration
A search for the doubly-charmed-baryon decay ${\it \Xi}_{cc}^{++}\to{\it \Xi}_{c}^{0}(\to p K^{-}K^{-}\pi^{+})\pi^{+}\pi^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of $5.4 {\,fb}^{-1}$. [...]
arXiv:2504.05063 ; LHCb-PAPER-2024-053 ; CERN-EP-2025-047 ; LHCB-PAPER-2024-053. - 2025 - 23.
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6.
Search for the $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ decay / LHCb Collaboration
A search for the decay $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ is reported using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8, and 13 $TeV$, corresponding to an integrated luminosity of $9fb^{-1}$. [...]
arXiv:2503.20039 ; CERN-EP-2025-042 ; LHCb-PAPER-2024-050 ; LHCB-PAPER-2024-050. - 2025 - 29.
Fulltext - Related data file(s) - Supplementary information - Fulltext
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7.
Observation of charge-parity symmetry breaking in baryon decays / LHCb Collaboration
The Standard Model of particle physics-the theory of particles and interactions at the smallest scale-predicts that matter and antimatter interact differently due to violation of the combined symmetry of charge conjugation ($C$) and parity ($P$). Charge conjugation transforms particles into their antimatter particles, whereas the parity transformation inverts spatial coordinates. [...]
arXiv:2503.16954; LHCb-PAPER-2024-054; CERN-EP-2025-031; LHCB-PAPER-2024-054.- Geneva : CERN, 2025-07-16 - 6 p. - Published in : Nature 643 (2025) 1223-1228 Fulltext: LHCb-PAPER-2024-054-supplementary - ZIP; 2503.16954 - PDF; document - PDF; LHCb-PAPER-2024-054 - PDF; Related data file(s): ZIP; External links: Interactions.org; Interactions.org
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8.
Branching fraction measurement of the decay $B^+ \to \psi(2S) \phi(1020) K^+$ / LHCb Collaboration
The branching fraction of the decay $B^+\to \psi(2S)\phi(1020)K^+$, relative to the topologically similar decay $B^+\to J/\psi \phi(1020) K^+$, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The ratio is found to be $0.061 \pm 0.004 \pm 0.009$, where the first uncertainty is statistical and the second systematic. [...]
arXiv:2503.02711; LHCb-PAPER-2024-039; CERN-EP-2025-011.- Geneva : CERN, 2025-05-01 - 15 p. - Published in : Phys. Rev. D 111 (2025) 092008 Fulltext: PaperToArXiv - PDF; 2503.02711 - PDF PDF; PhysRevD.111.092008 - PDF; Related data file(s): ZIP;
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9.
Observation of a new charmed baryon decaying to $\Xi_c^+ \pi^+ \pi^-$ / LHCb Collaboration
The $\Xi^+_c\pi^-\pi^+$ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb$^{-1}$, collected by the LHCb experiment during 2016-2018. [...]
arXiv:2502.18987 ; LHCb-PAPER-2024-055 ; CERN-EP-2025-019 ; LHCB-PAPER-2024-055. - 2025 - 22.
Fulltext - Related data file(s) - Full text - Fulltext
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10.
Angular analysis of $B^0 \to K^{*0} e^+e^-$ decays / LHCb Collaboration
An angular analysis of $B^0\rightarrow K^{*0}e^{+}e^{-}$ decays is presented using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. The analysis is performed in the region of the dilepton invariant mass squared of 1.1-6.0 GeV$^{2}/c^{4}$. [...]
arXiv:2502.10291; LHCb-PAPER-2024-022; CERN-EP-2025-001.- Geneva : CERN, 2025-06-13 - 61 p. - Published in : JHEP 2506 (2025) 140 Fulltext: 2502.10291v1 - PDF; 2502.10291 - PDF; document - PDF; LHCb-PAPER-2024-022-figures-JHEP - ZIP;
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