J. A. Boelhauve
A5082572551- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Stochastic processes and statistical mechanics
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Markov Chains and Monte Carlo Methods
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Algorithms and Data Compression
- Pulsars and Gravitational Waves Research
- Advanced Data Storage Technologies
- Stochastic processes and financial applications
- Probability and Statistical Research
- Cosmology and Gravitation Theories
TU Dortmund University
2020-2025
Universitat de València
2023-2024
Instituto de Física Corpuscular
2023-2024
University of Chinese Academy of Sciences
2020-2023
Central China Normal University
2020
Institute of High Energy Physics
2020
Tsinghua University
2020
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
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...
Using proton-proton collision data at centre-of-mass energies of $\sqrt{s} = 7$, $8$ and $13\mathrm{\,TeV}$ recorded by the LHCb experiment Large Hadron Collider, corresponding to an integrated luminosity $9\mathrm{\,fb}^{-1}$, invariant mass spectrum $J/ψ$ pairs is studied. A narrow structure around $6.9\mathrm{\,GeV/}c^2$ matching lineshape a resonance broad just above twice are observed. The deviation from nonresonant $J/ψ$-pair production five standard deviations in region between $6.2$...
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...
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...
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 B^{0}→K_{S}^{0}e^{+}e^{-} B^{+}→K^{*+}e^{+}e^{-} measured intervals the dilepton invariant mass squared. measurements performed using proton-proton collision data recorded by LHCb experiment, corresponding to integrated luminosity 9 fb^{-1} . results consistent with standard model previous tests related decay...
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...
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 $$ {\sigma}_{J/\psi}^{\textrm{coh}} <mml:math...
A measurement of the time-dependent ratio <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>D</a:mi><a:mn>0</a:mn></a:msup><a:mo stretchy="false">→</a:mo><a:mrow><a:msup><a:mi>K</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:mrow></a:math> to <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mrow><d:msup><d:mrow><d:mover accent="true"><d:mrow><d:mi>D</d:mi></d:mrow><d:mrow><d:mo...
The first study of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>ϕ</a:mi></a:math> production in diffractive processes proton-proton collisions is presented. based on an LHCb dataset recorded at center-of-mass energy 13 TeV, corresponding to integrated luminosity <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mn>5</c:mn><c:mtext> </c:mtext><c:mtext>...
The production of $\chi_{c1}(3872)$ and $\psi(2S)$ hadrons is studied as a function charged particle multiplicity in $pp$ collisions at center-of-mass energy 8 TeV, corresponding to an integrated luminosity 2 fb$^{-1}$. For both states, the fraction that produced promptly collision vertex found decrease increases. ratio cross-sections for particles also with multiplicity, while no significant dependence on observed equivalent away from $b$-hadron decays. This behavior consistent calculation...
A bstract combination of measurements sensitive to the CP violation angle γ Cabibbo-Kobayashi-Maskawa unitarity triangle and charm mixing parameters that describe oscillations between D 0 $$ \overline{D} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> mesons is performed. Results from beauty sectors, based on data collected with LHCb detector at CERN’s Large Hadron Collider, are combined for first time. This...
The first observation of the suppressed semileptonic $B_s^0 \to K^-\mu^+\nu_\mu$ decay is reported. Using a data sample recorded in {\it pp} collisions 2012 with LHCb detector, corresponding to an integrated luminosity 2 $\mathrm{fb}^{-1}$, branching fraction \mbox{$\mathcal{B}(B_s^0 K^-\mu^+\nu_\mu)$} measured be $(1.06\pm0.05~(\mathrm{stat})\pm0.08~(\mathrm{syst}))\times 10^{-4}$, where uncertainty statistical and second one represents combined systematic uncertainties. D_s^-\mu^+\nu_\mu$,...
Events containing a Z boson and charm jet are studied for the first time in forward region of proton-proton collisions. The data sample used corresponds to an integrated luminosity 6 fb^{-1} collected at center-of-mass energy 13 TeV with LHCb detector. In events jet, fraction jets is determined intervals Z-boson rapidity range 2.0<y(Z)<4.5. A sizable enhancement observed forwardmost y(Z) interval, which could be indicative valencelike intrinsic-charm component proton wave function.
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...
The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy 13 TeV with LHCb detector. D^{0} mesons are required originate from promptly produced D^{*+}→D^{0}π^{+} decays, and charge companion pion used determine flavor charm meson production. be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where first uncertainty statistical second...
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.
A study of resonant structures in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>B</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:mo...