A5006813668- 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
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Probability and Statistical Research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Data Storage Technologies
- Nuclear Physics and Applications
University of Oxford
2023-2025
École Polytechnique
2023-2025
Centre National de la Recherche Scientifique
2023-2025
Laboratoire Leprince-Ringuet
2023-2025
Tsinghua University
2023-2024
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...
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...
The <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 and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mo>+</c:mo></c:msup><c:mo stretchy="false">→</c:mo><c:mrow><c:mi>J</c:mi><c:mo>/</c:mo><c:mi>ψ</c:mi></c:mrow><c:msup><c:mi>π</c:mi><c:mo>+</c:mo></c:msup></c:math> are precisely measured relative to...
A study 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> and <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:msubsup><d:mi mathvariant="normal">Ξ</d:mi><d:mi>b</d:mi><d:mn>0</d:mn></d:msubsup></d:math> decays to <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mrow><g:mi...
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...
A bstract The first full amplitude analysis of B + → ψ (2 S ) K π − decays is performed using proton-proton collision data corresponding to an integrated luminosity 9 fb −1 recorded with the LHCb detector. rich spectrum studied and branching fractions resonant substructure associated prominent 1 (1270) contribution are measured. cannot be described by conventional strange charmonium resonances only. An model 53 components developed comprising 11 hidden-charm exotic hadrons. New production...
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 Ξ_{b}^{0(-)}→Ξ_{c}(3055)^{+(0)}(→D^{+(0)}Λ)π^{-} decay chains are observed, and the spin-parity of Ξ_{c}(3055)^{+(0)} baryons is determined for first time. measurement performed using proton-proton collision data at a center-of-mass energy sqrt[s]=13 TeV, corresponding to an integrated luminosity 5.4 fb^{-1}, recorded by LHCb experiment between 2016 2018. be 3/2^{+} with significance more than 6.5σ (3.5σ) compared all other tested hypotheses. up-down asymmetries...
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...
An amplitude analysis of <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...
Lepton flavor universality in rare <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>b</a:mi><a:mo stretchy="false">→</a:mo><a:mi>s</a:mi></a:math> transitions is tested for the first time using <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:msubsup><d:mi>B</d:mi><d:mi>s</d:mi><d:mn>0</d:mn></d:msubsup></d:math> meson decays. The measurements are performed <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
A search for <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:math> meson decays to the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>π</c:mi><c:mo>+</c:mo></c:msup><c:msup><c:mi>π</c:mi><c:mo>−</c:mo></c:msup><c:msup><c:mi>e</c:mi><c:mo>+</c:mo></c:msup><c:msup><c:mi>e</c:mi><c:mo>−</c:mo></c:msup></c:math> and <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"...
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...
An amplitude analysis of the <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:mn>0</a:mn></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mrow><a:mi>K</a:mi></a:mrow><a:mrow><a:mo>*</a:mo><a:mn>0</a:mn></a:mrow></a:msup><a:msup><a:mrow><a:mi>μ</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:msup><a:mrow><a:mi>μ</a:mi></a:mrow><a:mrow><a:mo>−</a:mo></a:mrow></a:msup></a:mrow></a:math> decay is...
The LHCb Collaboration measures production of the exotic hadron <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>χ</a:mi><a:mrow><a:mi>c</a:mi><a:mn>1</a:mn></a:mrow></a:msub><a:mo stretchy="false">(</a:mo><a:mn>3872</a:mn><a:mo stretchy="false">)</a:mo></a:math> in proton-nucleus collisions for first time. Comparison with charmonium state <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>ψ</e:mi><e:mrow><e:mo...
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...
The fraction of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>χ</a:mi><a:mrow><a:mi>c</a:mi><a:mn>1</a:mn></a:mrow></a:msub></a:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>χ</c:mi><c:mrow><c:mi>c</c:mi><c:mn>2</c:mn></c:mrow></c:msub></c:math> decays in the prompt <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>J</e:mi><e:mo>/</e:mo><e:mi>ψ</e:mi></e:math> yield, <g:math...
A bstract The production cross-section of J/ψ pairs in proton-proton collisions at a centre-of-mass energy $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV is measured using data sample corresponding to an integrated luminosity 4 . 2 fb − 1 collected by the LHCb experiment. measurement performed with both mesons transverse momentum range 0 < p T 14 GeV/ c and rapidity y 5. this process be 16 36 ± 28...
A bstract comprehensive study of the local and nonlocal amplitudes contributing to decay B 0 → K *0 (→ + π − ) μ is performed by analysing phase-space distribution products. The analysis based on pp collision data corresponding an integrated luminosity 8.4 fb 1 collected LHCb experiment. This measurement employs for first time a model both one-particle two-particle amplitudes, utilises complete dimuon mass spectrum without any veto regions around narrow charmonium resonances. In this way it...
An amplitude analysis of the B0→K*0μ+μ− decay is presented. The based on data collected by LHCb experiment from proton-proton collisions at s=7, 8 and 13 TeV, corresponding to an integrated luminosity 4.7 fb−1. For first time, Wilson coefficients nonlocal hadronic contributions are accessed directly unbinned data, where latter parametrized as a function q2 with polynomial expansion. parameters determined under two alternative hypotheses: relies experimental information alone, while second...
A search for hidden-charm pentaquark states decaying to a range of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi mathvariant="normal">Σ</a:mi></a:mrow><a:mrow><a:mi>c</a:mi></a:mrow></a:msub><a:mover accent="true"><a:mrow><a:mi>D</a:mi></a:mrow><a:mrow><a:mo stretchy="false">¯</a:mo></a:mrow></a:mover></a:mrow></a:math> and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mrow><f:msubsup><f:mrow><f:mi...
The production of prompt <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi>D</a:mi><a:mi>s</a:mi><a:mo>+</a:mo></a:msubsup></a:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>D</c:mi><c:mo>+</c:mo></c:msup></c:math> mesons is measured by the LHCb experiment in proton-lead (<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:mi>p</e:mi><e:mi>Pb</e:mi></e:mrow></e:math>) collisions...
For accurate determination of particle masses knowledge the momentum scale detectors is crucial. The procedure used to calibrate LHCb spectrometer described and illustrated using performance obtained with an integrated luminosity $1.6~ fb^{-1}$ collected during 2016 in $pp$ running. uses large samples $J/\psi \rightarrow \mu^+ \mu^-$ $B^+ J/\psi K^+$ decays leads a relative accuracy $3 \times 10^{-4}$ on scale.
A comprehensive study of the angular distributions in bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample proton-proton collisions corresponding to an integrated luminosity 9 fb^{-1} collected LHCb experiment at center-of-mass energies 7, 8, and 13 TeV. The decay parameters associated charge-parity (CP) asymmetries are measured, no significant CP violation observed. For first time,...