P. d’Argent
A5063798383- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Medical and Biological Sciences
- Distributed and Parallel Computing Systems
- Oral microbiology and periodontitis research
- International Science and Diplomacy
- Cosmology and Gravitation Theories
- Temporomandibular Joint Disorders
- Oral Health Pathology and Treatment
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Markov Chains and Monte Carlo Methods
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2023-2025
Universitat Ramon Llull
2023-2024
TU Dortmund University
2023-2024
European Organization for Nuclear Research
2004-2023
Heidelberg University
2015-2020
Aix-Marseille Université
2020
Centre de physique des particules de Marseille
1997-2019
Universidade Federal do Rio de Janeiro
2019
Imperial College London
2016-2017
Centro Brasileiro de Pesquisas Físicas
2016-2017
Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, Λ0b→J/ψK−p decays are presented. The data sample corresponds an integrated luminosity 3 fb−1 acquired with LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis three-body final state reproduces two-body mass angular distributions. To obtain a satisfactory fit seen spectrum, it is necessary include two Breit-Wigner amplitudes that each describe resonant state. significance...
A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in data sample Λ_{b}^{0}→J/ψpK^{-} decays, which an order magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} structure formerly reported confirmed and observed consist two overlapping peaks, P_{c}(4440)^{+} P_{c}(4457)^{+}, where this two-peak interpretation 5.4σ. proximity Σ_{c}^{+}D[over ¯]^{0} ¯]^{*0} thresholds peaks suggests they...
An angular analysis of the B 0 → K *0(→ + π −)μ μ − decay is presented. The dataset corresponds to an integrated luminosity 3.0 fb−1 pp collision data collected at LHCb experiment. complete information from used determine CP-averaged observables and CP asymmetries, taking account possible contamination decays with system in S-wave configuration. their correlations are reported bins q 2, invariant mass squared dimuon system. determined both unbinned maximum likelihood fit by using principal...
A highly significant structure is observed in the $\Lambda_c^+K^-\pi^+\pi^+$ mass spectrum, where $\Lambda_c^+$ baryon reconstructed decay mode $pK^-\pi^+$. The consistent with originating from a weakly decaying particle, identified as doubly charmed $\Xi_{cc}^{++}$. difference between masses of $\Xi_{cc}^{++}$ and states measured to be $1334.94 \pm 0.72 (\mathrm{stat}) 0.27 (\mathrm{syst}~\mathrm{MeV}/c^2$, then determined $3621.40 (\mathrm{syst} 0.14 \, (\Lambda_c^+)~\mathrm{MeV}/c^2$,...
The $\Xi_c^+ K^-$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity 3.3 fb$^{-1}$, collected by the LHCb experiment. $\Xi_c^+$ reconstructed in decay mode $p K^- \pi^+$. Five new, narrow excited $\Omega_c^0$ states are observed: $\Omega_c(3000)^0$, $\Omega_c(3050)^0$, $\Omega_c(3066)^0$, $\Omega_c(3090)^0$, and $\Omega_c(3119)^0$. Measurements their masses widths reported.
A search for the rare decays B_{s}^{0}→μ^{+}μ^{-} and B^{0}→μ^{+}μ^{-} is performed at LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb^{-1}. An excess observed with significance 7.8 standard deviations, representing first observation this decay single experiment. The branching fraction measured be B(B_{s}^{0}→μ^{+}μ^{-})=(3.0±0.6_{-0.2}^{+0.3})×10^{-9}, where uncertainty statistical second systematic. measurement effective...
The LHCb Upgrade II will fully exploit the flavour-physics opportunities of HL-LHC, and study additional physics topics that take advantage forward acceptance spectrometer. I begin operation in 2020. Consolidation occur, modest enhancements detector be installed, Long Shutdown 3 LHC (2025) these are discussed here. main installed long shutdown 4 (2030) build on strengths current experiment I. It operate at a luminosity up to $ 2 \times 10^{34} \rm cm^{-2}s^{-1}$, ten times detector. New...
A measurement is reported of the ratio branching fractions R(J/ψ)=B(B_{c}^{+}→J/ψτ^{+}ν_{τ})/B(B_{c}^{+}→J/ψμ^{+}ν_{μ}), where τ^{+} lepton identified in decay mode τ^{+}→μ^{+}ν_{μ}ν[over ¯]_{τ}. This analysis uses a sample proton-proton collision data corresponding to 3.0 fb^{-1} integrated luminosity recorded with LHCb experiment at center-of-mass energies 7 and 8 TeV. signal found for B_{c}^{+}→J/ψτ^{+}ν_{τ} significance 3 standard deviations corrected systematic uncertainty, measured be...
A search for charge-parity (CP) violation in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9 fb^{-1} collected at a center-of-mass energy 13 TeV with the LHCb detector. The flavor charm meson inferred from charge pion D^{*}(2010)^{+}→D^{0}π^{+} or muon B[over ¯]→D^{0}μ^{-}ν[over ¯]_{μ}X decays. difference between CP asymmetries measured be ΔA_{CP}=[-18.2±3.2(stat)±0.9(syst)]×10^{-4} π-tagged...
A bstract search for $$ {B}_s^0\to {\overline{D}}^0{f}_0(980) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mover><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mfenced><mml:mn>980</mml:mn></mml:mfenced></mml:math> decays is performed using 3 . 0 fb 1− of pp collision data...
An angular analysis and a measurement of the differential branching fraction decay B 0 → ϕμ + μ − are presented, using data corresponding to an integrated luminosity 3.0 fb−1 pp collisions recorded by LHCb experiment at $$ \sqrt{s}=7 8 TeV. Measurements reported as function q 2, square dimuon invariant mass results found be consistent with Standard Model. In range 1 < 2 6 GeV2 /c 4, where precise theoretical calculations available, is more than 3σ below Model predictions.
The first full amplitude analysis of $B^+\to J/ψϕK^+$ with $J/ψ\toμ^+μ^-$, $ϕ\to K^+K^-$ decays is performed a data sample 3 fb$^{-1}$ $pp$ collision collected at $\sqrt{s}=7$ and $8$ TeV the LHCb detector. cannot be described by model that contains only excited kaon states decaying into $ϕK^+$, four $J/ψϕ$ structures are observed, each significance over $5$ standard deviations. quantum numbers these determined least $4$ lightest has mass consistent with, but width much larger than, previous...
The data sample of Λ0b→J/ψpK− decays acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity 3 fb−1, is inspected for presence J/ψp or J/ψK− contributions minimal assumptions about K−p contributions. It demonstrated at more than nine standard deviations that cannot be described alone, play a dominant role in this incompatibility. These model-independent results support previously obtained model-dependent evidence P+c→J/ψp...
A full amplitude analysis of $\Lambda_b^0 \to J/\psi p \pi^-$ decays is performed with a data sample acquired the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integrated luminosity 3 fb$^{-1}$. significantly better description achieved when, in addition previously observed nucleon excitations $N\to p\pi^-$, either $P_c(4380)^+$ $P_c(4450)^+\to p$ states, K^-$ decays, or $Z_c(4200)^-\to state, reported $B^0 K^+ all three, are included models. The support model...
The doubly charmed baryon decay ${\mathrm{\ensuremath{\Xi}}}_{cc}^{++}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}_{c}^{+}{\ensuremath{\pi}}^{+}$ is observed for the first time, with a statistical significance of $5.9\ensuremath{\sigma}$, confirming recent observation in ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ final state. data sample used corresponds to an integrated luminosity $1.7\text{ }\text{...
A search for a long-lived scalar particle $\ensuremath{\chi}$ is performed, looking the decay ${B}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\chi}$ with $\ensuremath{\chi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ in $pp$ collision data corresponding to an integrated luminosity of $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by LHCb experiment at center-of-mass energies $\sqrt{s}=7$ and 8 TeV. This new particle, predicted hidden...
A measurement of the differential branching fraction decay B 0 → K ∗(892)0 μ + − is presented together with a determination S-wave π system in +π− −. The analysis based on pp-collision data corresponding to an integrated luminosity 3 fb−1 collected LHCb experiment. measurements are made bins invariant mass squared dimuon system, q 2. Precise theoretical predictions for decays available 2 region 1.1 < 6.0 GeV2 /c 4. In this region, range 796 m Kπ 996 MeV/c 2, found be $$...
The LHCb Outer Tracker is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers straw tubes. performance the presented based on data LHC Run 2 running period from 2015 and 2016. Occupancies operational experience for collected in pp, pPb PbPb collisions are described. An updated study ageing effects showing no signs gain deterioration or other radiation damage effects. In addition several improvements respect to 1 taking introduced. A novel real-time calibration...
The first full amplitude analysis of $B^+\to J/ψϕK^+$ with $J/ψ\toμ^+μ^-$, $ϕ\to K^+K^-$ decays is performed a data sample 3 fb$^{-1}$ $pp$ collision collected at $\sqrt{s}=7$ and $8$ TeV the LHCb detector. cannot be described by model that contains only excited kaon states decaying into $ϕK^+$, four $J/ψϕ$ structures are observed, each significance over $5$ standard deviations. quantum numbers these determined least $4$ lightest has mass consistent with, but width much larger than, previous...
Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$. The analysis is based on an integrated luminosity $2.0\mathrm{\,fb}^{-1}$ recorded with the LHCb detector. bosons identified in $W\rightarrow\mu\nu$ and $Z\rightarrow\mu^{+}\mu^{-}$ decay channels. cross-sections measured for muons pseudorapidity range $2.0 < \eta 4.5$, transverse momenta $p_{\rm T} > 20{\mathrm{\,Ge\kern V\!/}c}$...
From samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$, 8 and 13 TeV, corresponding to integrated luminosities 1.0, 2.0 $1.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively, a peak in both ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{K}^{\ensuremath{-}}$ ${\mathrm{\ensuremath{\Xi}}}_{b}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ invariant mass spectra is observed. In quark model, radially orbitally excited...
The resonant substructures of ${B}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays are studied with the Dalitz plot technique. In this study a data sample corresponding to an integrated luminosity $3.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $pp$ collisions collected by LHCb detector is used. branching fraction decay in region $m({\overline{D}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})>2.1\text{...
Production cross-sections of prompt charm mesons are measured with the first data from pp collisions at LHC a centre-of-mass energy 13 TeV. The sample corresponds to an integrated luminosity 4.98 ± 0.19 pb−1 collected by LHCb experiment. production D 0, +, + , and *+ in bins meson transverse momentum, p T, rapidity, y, cover range 0 < T 15GeV/c 2.0 y 4.5. inclusive for four mesons, including charge conjugation, within 1 8 GeV/c found be $$ \begin{array}{l}\sigma \left( pp\to...
Angular correlations in ${B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+}$ decays, with $X(3872)\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}J/\ensuremath{\psi}$, ${\ensuremath{\rho}}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, are used to measure orbital angular momentum contributions determine the ${J}^{PC}$ value of $X(3872)$ meson. The data...