A5107143317- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Medical Imaging Techniques and Applications
- Markov Chains and Monte Carlo Methods
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Stochastic processes and financial applications
- International Science and Diplomacy
- Machine Learning in Materials Science
- Radiation Detection and Scintillator Technologies
- Transition Metal Oxide Nanomaterials
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Insurance, Mortality, Demography, Risk Management
Wuhan University
2020-2024
Tsinghua University
2020-2024
Institute of High Energy Physics
2024
Chinese Academy of Sciences
2024
Universidad Nacional de Colombia
2023
University of Padua
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2021
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...
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 ratio of the B0s and B0 fragmentation fractions, fs/fd, in proton-proton collisions at LHC, is obtained as a function B-meson transverse momentum collision center-of-mass energy from combined analysis different B-decay channels measured by LHCb experiment. results are described linear meson or with inspired Tsallis statistics. Precise measurements branching fractions B0s→J/ψϕ B0s→D−sπ+ decays performed, reducing their uncertainty about factor 2 respect to previous world averages....
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 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...
An angular analysis of the rare decay $B^0_s\rightarrow\phi\mu^+\mu^-$ is presented, using proton-proton collision data collected by LHCb experiment at centre-of-mass energies $7$, $8$ and $13~\rm{TeV}$, corresponding to an integrated luminosity $8.4~\rm{fb}^{-1}$. The observables describing distributions are determined in regions $q^2$, square dimuon invariant mass. results consistent with Standard Model predictions.
The production of $\chi_{c1}(3872)$ and $\psi(2S)$ hadrons is studied as a function charged particle multiplicity in $pp$ collisions at center-of-mass energy 8 TeV, corresponding to an integrated luminosity 2 fb$^{-1}$. For both states, the fraction that produced promptly collision vertex found decrease increases. ratio cross-sections for particles also with multiplicity, while no significant dependence on observed equivalent away from $b$-hadron decays. This behavior consistent calculation...
An amplitude analysis of the B+→D+sD−sK+ decay is carried out to study for first time its intermediate resonant contributions, using proton-proton collision data collected with LHCb detector at center-of-mass energies 7, 8, and 13 TeV. A near-threshold peaking structure, referred as X(3960), observed in D+sD−s invariant-mass spectrum significance greater than 12 standard deviations. The mass, width, quantum numbers structure are measured be 3956±5±10 MeV, 43±13±8 JPC=0++, respectively, where...
Two new excited states, Ω_{c}(3185)^{0} and Ω_{c}(3327)^{0}, are observed in the Ξ_{c}^{+}K^{-} invariant-mass spectrum using proton-proton collision data collected by LHCb experiment, corresponding to an integrated luminosity of 9 fb^{-1}. Five previously Ω_{c}^{0} states confirmed, namely Ω_{c}(3000)^{0}, Ω_{c}(3050)^{0}, Ω_{c}(3065)^{0}, Ω_{c}(3090)^{0}, Ω_{c}(3119)^{0}. The masses widths these seven measured with highest precision date.
The decay-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> asymmetry in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msubsup><c:mi>B</c:mi><c:mi>s</c:mi><c:mn>0</c:mn></c:msubsup><c:mo stretchy="false">→</c:mo><c:mi>J</c:mi><c:mo>/</c:mo><c:mi>ψ</c:mi><c:mo stretchy="false">(</c:mo><c:mo...
A bstract Searches are performed for a low-mass dimuon resonance, X , produced in proton-proton collisions at center-of-mass energy of 13 TeV, using data sample corresponding to an integrated luminosity 5.1 fb − 1 and collected with the LHCb detector. The bosons can either decay promptly or displaced from collision, where both cases requirements placed on event assumptions made about production mechanisms kept as minimal possible. searches decaying explore mass range near threshold up 60...
Abstract Mesons comprising a beauty quark and strange can oscillate between particle ( $${B}_{\mathrm{s}}^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mrow> <mml:mi>B</mml:mi> </mml:mrow> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> ) antiparticle $${\overline{B}}_{\mathrm{s}}^{0}$$ <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> flavour eigenstates, with frequency given by the mass difference heavy light Δ m s . Here we present...
Measurements of $CP$ asymmetries in charmless three-body decays $B^\pm$ mesons are reported using proton-proton collision data collected by the LHCb detector, corresponding to an integrated luminosity 5.9$\,$fb$^{-1}$. The previously observed asymmetry $B^\pm \to \pi^\pm K^+ K^-$ is confirmed, and with a significance more than five standard deviations \pi^+ \pi^-$ K^\pm decays, while confirmed be compatible zero. distributions these also studied as function phase space suggest contributions...
The first observation and study of two new baryonic structures in the final state ${\mathrm{\ensuremath{\Xi}}}_{b}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ confirmation ${\mathrm{\ensuremath{\Xi}}}_{b}{(6100)}^{\ensuremath{-}}$ ${\mathrm{\ensuremath{\Xi}}}_{b}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decay mode are reported using proton-proton collision data collected by LHCb experiment, corresponding to an integrated luminosity $9\text{...