A5065816730- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Stochastic processes and statistical mechanics
- Advanced Data Storage Technologies
- Markov Chains and Monte Carlo Methods
- Geophysics and Gravity Measurements
- International Science and Diplomacy
- Energy Harvesting in Wireless Networks
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Innovative Energy Harvesting Technologies
- CCD and CMOS Imaging Sensors
- Analog and Mixed-Signal Circuit Design
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2019-2025
Scuola Normale Superiore
2020-2025
State Key Laboratory of Nuclear Physics and Technology
2023-2024
Peking University
2023-2024
Istituto Nazionale di Fisica Nucleare
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2022
University of Trieste
2021-2022
University of Siena
2020
University of Brescia
2012-2013
Abstract The standard model of particle physics currently provides our best description fundamental particles and their interactions. theory predicts that the different charged leptons, electron, muon tau, have identical electroweak interaction strengths. Previous measurements shown a wide range decays are consistent with this principle lepton universality. This article presents evidence for breaking universality in beauty-quark decays, significance 3.1 deviations, based on proton–proton...
Abstract Conventional, hadronic matter consists of baryons and mesons made three quarks a quark–antiquark pair, respectively 1,2 . Here, we report the observation state containing four in Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, $$\overline{{{{{u}}}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>u</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> $$\overline{{{{{d}}}}}$$...
Quantum chromodynamics, the theory of strong force, describes interactions coloured quarks and gluons formation hadronic matter. Conventional matter consists baryons mesons made three quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported narrow state in D
First evidence of a structure in the J/ψΛ invariant mass distribution is obtained from an amplitude analysis Ξb-→J/ψΛK- decays. The observed consistent with being due to charmonium pentaquark strangeness significance 3.1σ including systematic uncertainties and look-elsewhere effect. Its width are determined be 4458.8±2.9-1.1+4.7MeV 17.3±6.5-5.7+8.0MeV, respectively, where quoted statistical systematic. also two resonances. In addition, narrow excited Ξ- states, Ξ1690- Ξ1820-, seen for first...
We present an angular analysis of the $B^{+}\rightarrow K^{\ast+}(\rightarrow K_{S}^{0}\pi^{+})\mu^{+}\mu^{-}$ decay using 9$\,\mbox{fb}^{-1}$ $pp$ collision data collected with LHCb experiment. For first time, full set CP-averaged observables is measured in intervals dimuon invariant mass squared. Local deviations from Standard Model predictions are observed, similar to those previous analyses isospin-partner $B^{0}\rightarrow K^{\ast0}\mu^{+}\mu^{-}$ decay. The global tension dependent on...
The branching fraction of the rare B_{s}^{0}→ϕμ^{+}μ^{-} decay is measured using data collected by LHCb experiment at center-of-mass energies 7, 8, and 13 TeV, corresponding to integrated luminosities 1, 2, 6 fb^{-1}, respectively. reported in intervals q^{2}, square dimuon invariant mass. In q^{2} region between 1.1 6.0 GeV^{2}/c^{4}, measurement found lie 3.6 standard deviations below a model prediction based on combination light cone sum rule lattice QCD calculations. addition, first...
Branching fraction and effective lifetime measurements of the rare decay $B^0_s\to\mu^+\mu^-$ searches for decays $B^0\to\mu^+\mu^-$ $B^0_s\to\mu^+\mu^-\gamma$ are reported using proton-proton collision data collected with LHCb detector at centre-of-mass energies $7$ TeV, $8$ TeV $13$ corresponding to a luminosity $9$ fb$^{-1}$. The branching ${\mathcal{B}}(B^0_s\to\mu^+\mu^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times 10^{-9}$ $\tau(B^0_s\to\mu^+\mu^-)=(2.07\pm 0.29\pm 0.03)$...
The first simultaneous test of muon-electron universality using B^{+}→K^{+}ℓ^{+}ℓ^{-} and B^{0}→K^{*0}ℓ^{+}ℓ^{-} decays is performed, in two ranges the dilepton invariant-mass squared, q^{2}. analysis uses beauty mesons produced proton-proton collisions collected with LHCb detector between 2011 2018, corresponding to an integrated luminosity 9 fb^{-1}. Each four lepton measurements reported either given q^{2} interval or supersedes previous measurements. results are compatible predictions...
An amplitude analysis of B^{-}→J/ψΛp[over ¯] decays is performed using 4400 signal candidates selected on a data sample pp collisions recorded at center-of-mass energies 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity 9 fb^{-1}. A narrow resonance in J/ψΛ system, consistent pentaquark candidate strangeness, observed high significance. The mass width this new state are measured be 4338.2±0.7±0.4 MeV 7.0±1.2±1.3 MeV, where first uncertainty statistical second...
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 square dilepton invariant mass, q2. The measurement uses a sample beauty meson produced proton-proton collisions collected with LHCb detector between 2011 2018, corresponding an integrated luminosity 9 fb−1. sequence multivariate selections strict particle identification requirements produce higher signal purity better statistical sensitivity per unit than previous...
A combined amplitude analysis is performed for the decays B^{0}→D[over ¯]^{0}D_{s}^{+}π^{-} and B^{+}→D^{-}D_{s}^{+}π^{+}, which are related by isospin symmetry. The based on data collected LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, 13 TeV. full sample corresponds to an integrated luminosity 9 fb^{-1}. Two new resonant states with masses 2.908±0.011±0.020 GeV widths 0.136±0.023±0.013 observed, decay D_{s}^{+}π^{+} D_{s}^{+}π^{-} respectively. former state...
The branching fraction $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})$ is measured relative to that of the normalization mode ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ using hadronic...
The ratios of branching fractions $\mathcal{R}({D}^{*})\ensuremath{\equiv}\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})/\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\mu}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}})$ and...
A study of the lineshape $\chi_{c1}(3872)$ state is made using a data sample corresponding to an integrated luminosity $3\,$fb$^{-1}$ collected in $pp$ collisions at centre-of-mass energies 7 and 8\,TeV with LHCb detector. Candidate $\psi(2S)$ mesons from b-hadron decays are selected $ J/\psi \pi^+ \pi^-$ decay mode. Describing {\mbox{lineshape}} Breit--Wigner function, mass splitting between states, $\Delta m$, width state, $\Gamma_{\mathrm{BW}}$, determined be \begin{eqnarray*} \Delta m &...
The first observation of the semileptonic b-baryon decay Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ}, with a significance 6.1σ, is reported using data sample corresponding to 3 fb^{-1} integrated luminosity, collected by LHCb experiment at center-of-mass energies 7 and 8 TeV LHC. τ^{-} lepton reconstructed in hadronic three charged pions. ratio K=B(Λ_{b}^{0}→Λ_{c}^{+}τ^{-}ν[over ¯]_{τ})/B(Λ_{b}^{0}→Λ_{c}^{+}π^{-}π^{+}π^{-}) measured be 2.46±0.27±0.40, where uncertainty statistical second...
Resonant contributions in $B^0 \rightarrow \overline{D}^0 D^+_s\pi^-$ and $B^+\rightarrow D^- D^+_s\pi^+$ decays are determined with an amplitude analysis, which is performed both separately simultaneously, where the latter case isospin symmetry between assumed. The analysis based on data collected by LHCb detector proton-proton collisions at center-of-mass energies of 7, 8 13 $\rm{TeV}$. full sample corresponds to integrated luminosity 9 $\rm fb^{-1}$. A doubly charged spin-0 open-charm...
A bstract The cross-sections of exclusive (coherent) photoproduction J/ψ and ψ (2S) mesons in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy 5 . 02 TeV are measured using data sample corresponding to an integrated luminosity 228 ± 10 μb − 1 , collected by the LHCb experiment 2018. differential separately as function transverse momentum rapidity nucleus-nucleus frame for mesons. be $$ {\sigma}_{J/\psi}^{\textrm{coh}} <mml:math...
A measurement of time-dependent <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> violation in the decays <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mn>0</c:mn></c:msup></c:math> and <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msup><e:mover accent="true"><e:mi>B</e:mi><e:mo stretchy="false">¯</e:mo></e:mover><e:mn>0</e:mn></e:msup></e:math> mesons to...
Abstract The LHCb upgrade represents a major change of the experiment. detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that previous periods. Readout all into all-software trigger is central new design, facilitating reconstruction events maximum LHC interaction rate, and their selection in real time. experiment's tracking system has upgraded with pixel vertex detector, silicon tracker upstream dipole magnet three...
The production rate of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi mathvariant="normal">Λ</a:mi><a:mi>b</a:mi><a:mn>0</a:mn></a:msubsup></a:math> baryons relative to <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:msup><d:mi>B</d:mi><d:mn>0</d:mn></d:msup></d:math> mesons in <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mi>p</f:mi><f:mi>p</f:mi></f:math> collisions at a center-of-mass energy...
A measurement of the time-dependent ratio <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>D</a:mi><a:mn>0</a:mn></a:msup><a:mo stretchy="false">→</a:mo><a:mrow><a:msup><a:mi>K</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:mrow></a:math> to <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mrow><d:msup><d:mrow><d:mover accent="true"><d:mrow><d:mi>D</d:mi></d:mrow><d:mrow><d:mo...
Abstract Charged-particle trajectories are usually reconstructed with the LHCb detector using combined information from tracking devices placed upstream and downstream of 4 T m dipole magnet. Trajectories only tracker magnet, which referred to as tracks, have not been used for physics analysis date. The challenges reconstruction long-lived particles tracks use discussed solutions proposed. feasibility performance studied samples $$\varvec{\Lambda }$$ <mml:math...
The first study of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>ϕ</a:mi></a:math> production in diffractive processes proton-proton collisions is presented. based on an LHCb dataset recorded at center-of-mass energy 13 TeV, corresponding to integrated luminosity <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mn>5</c:mn><c:mtext> </c:mtext><c:mtext>...
A bstract An angular analysis of the $$ {B}_s^0 <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:math> → ϕe + e − decay is performed using proton-proton collision dataset collected between 2011 and 2018 by LHCb experiment, corresponding to an integrated luminosity 9 fb 1 at centre-of-mass energies 7, 8 13 TeV. The in very low dielectron invariant mass-squared region 0 . 0009 2615 GeV 2 /c 4...
A bstract measurement of the $$ {\varXi}_{cc}^{++} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>Ξ</mml:mi><mml:mi>cc</mml:mi><mml:mrow><mml:mo>+</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:math> mass is performed using data collected by LHCb experiment between 2016 and 2018 in pp collisions at a centre-of-mass energy 13 TeV, corresponding to an integrated luminosity 5 . 6 fb − 1 The candidates are reconstructed via decay modes...