A5107855231- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced Data Storage Technologies
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Nuclear physics research studies
- Medical Device Sterilization and Disinfection
- Particle Accelerators and Free-Electron Lasers
- Fusion materials and technologies
- Nuclear reactor physics and engineering
- Infection Control and Ventilation
- Algorithms and Data Compression
- Infection Control in Healthcare
- Distributed and Parallel Computing Systems
- Muon and positron interactions and applications
University of Iowa Health Care
2024
Imperial College London
2016-2021
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2021
Institut National de Physique Nucléaire et de Physique des Particules
2021
Centre National de la Recherche Scientifique
2021
Université Paris-Saclay
2021
Centro Brasileiro de Pesquisas Físicas
2017-2018
The London College
2017
European Organization for Nuclear Research
2011-2017
University College London
2010-2016
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...
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 ratio of branching fractions R(D*−)≡B(B0→D*−τ+ντ)/B(B0→D*−μ+νμ) is measured using a data sample proton-proton collisions collected with the LHCb detector at center-of-mass energies 7 and 8 TeV, corresponding to an integrated luminosity 3 fb−1. For first time, R(D*−) determined τ-lepton decays three charged pions in final state. B0→D*−τ+ντ yield normalized that B0→D*−π+π−π+ mode, providing measurement B(B0→D*−τ+ντ)/B(B0→D*−π+π−π+)=1.97±0.13±0.18, where uncertainty statistical second...
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...
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...
An angular analysis of the $B^{0}\rightarrow K^{*0}(\to K^{+}\pi^{-})\mu^{+}\mu^{-}$ decay is presented using a data set corresponding to an integrated luminosity 4.7 fb$^{-1}$ $pp$ collision collected with LHCb experiment. The full $C\!P$-averaged observables are determined in bins invariant mass squared dimuon system. Contamination from decays $K^{+}\pi^{-}$ system S-wave configuration taken into account. tension seen between previous results and Standard Model predictions persists new...
The first observation of exotic states with a new quark content $c \bar{c} u \bar{s}$ decaying to the $J/\psi K^+$ final state is reported high significance from an amplitude analysis $B^+ \to J/\psi \phi decay. carried out using proton-proton collision data corresponding total integrated luminosity 9 fb$^{-1}$ collected by LHCb experiment at centre-of-mass energies 7, 8 and 13 TeV. most significant state, $Z_{cs}(4000)^+$, has mass $4003\pm6\,^{+\,\phantom{0}4}_{-\,14}$ MeV, width...
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...
The first measurement of the lifetime doubly charmed baryon $\Xi_{cc}^{++}$ is presented, with signal reconstructed in final state $\Lambda_c^+ K^- \pi^+ \pi^+$. data sample used corresponds to an integrated luminosity $1.7\,\mathrm{fb}^{-1}$, collected by LHCb experiment proton-proton collisions at a centre-of-mass energy $13\mathrm{\,Te\kern -0.1em V}$. measured be $0.256\,^{+0.024}_{-0.022}{\,\rm (stat)\,} \pm 0.014 {\,\rm(syst)}\mathrm{\,ps}$.
The B0sπ± invariant mass distribution is investigated in order to search for possible exotic meson states. analysis based on a data sample recorded with the LHCb detector corresponding 3 fb−1 of pp collision at √s=7 and 8 TeV. No significant excess found, upper limits are set production rate claimed X(5568) state within acceptance. Upper also as function width decaying final state. same apply through chain B*0sπ±, B*0s→B0sγ where photon excluded from reconstructed decays.Received 2 August...
We report four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity 9 fb^{-1} recorded by LHCb experiment. Referring these states their mass, values are m[Ω_{b}(6316)^{-}]=6315.64±0.31±0.07±0.50 MeV, m[Ω_{b}(6330)^{-}]=6330.30±0.28±0.07±0.50 m[Ω_{b}(6340)^{-}]=6339.71±0.26±0.05±0.50 m[Ω_{b}(6350)^{-}]=6349.88±0.35±0.05±0.50 where uncertainties statistical, systematic, last...
The production of J/ψ mesons in jets is studied the forward region proton-proton collisions using data collected with LHCb detector at a center-of-mass energy 13 TeV. fraction jet transverse momentum carried by meson, z(J/ψ)≡pT(J/ψ)/pT(jet), measured pT(jet)>20 GeV pseudorapidity range 2.5<η(jet)<4.0. observed z(J/ψ) distribution for produced b-hadron decays consistent expectations. However, results prompt do not agree predictions based on fixed-order nonrelativistic QCD. This first...
The first observation of two structures consistent with resonances in the final states Λ_{b}^{0}π^{-} and Λ_{b}^{0}π^{+} is reported using samples pp collision data collected by LHCb experiment at sqrt[s]=7 8 TeV, corresponding to an integrated luminosity 3 fb^{-1}. ground Σ_{b}^{±} Σ_{b}^{*±} are also confirmed their masses widths precisely measured.
A bstract Measurements are reported of the central exclusive production J/ψ and ψ (2 S ) mesons in pp collisions at a centre-of-mass energy 13 TeV. Backgrounds significantly reduced compared to previous measurements made lower energies through use new forward shower counters. The products cross-sections branching fractions for decays dimuons, where both muons within pseudorapidity range 2 . 0 < η 4 5, measured be $$ \begin{array}{c}\hfill {\sigma}_{J/\psi \to {\mu}^{+}{\mu}^{-}} = 435 \pm...
We report a measurement of the mass difference between neutral charm-meson eigenstates using novel approach that enhances sensitivity to this parameter. use $2.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${D}^{0}\ensuremath{\rightarrow}{K}_{\mathit{S}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays reconstructed in proton-proton collisions collected by LHCb experiment 2011 and 2012. Allowing for $CP$ violation mixing interference decay, we measure $CP$-averaged...
A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies 7 8 TeV, corresponding to integrated luminosities 1 2 $$\,\hbox {fb}^{-1}$$ , respectively. analysis performed assuming set production mechanisms with simple topologies, including the Higgs-like particle particles. mass range from 20 80 $$\mathrm{{GeV}}/c^2$$ lifetimes 5 100 $${\,\mathrm{{ps}}}$$ are explored. Results also...
Using $pp$ collision data corresponding to an integrated luminosity of $8.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded by the LHCb experiment at center-of-mass energies $\sqrt{s}=7$, 8, and 13 TeV, observation excited ${B}_{c}^{+}$ state in ${B}_{c}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ invariant-mass spectrum is reported. The observed peak has a mass...
A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples pp collisions collected with the LHCb detector at centre-of-mass energies s=7,8 and 13TeV , corresponding to a total integrated luminosity 4.7fb-1 . satisfactory description obtained when including contribution representing an exotic ηc(1S)π- resonant state. The significance this resonance more than three standard deviations, while its mass width are 4096±20-22+18MeV 152±58-35+60MeV respectively. spin-parity...
A bstract measurement of the $$ {\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...
Observations are reported of different sources CP violation from an amplitude analysis B^{+}→π^{+}π^{+}π^{-} decays, based on a data sample corresponding to integrated luminosity 3 fb^{-1} pp collisions recorded with the LHCb detector. A large asymmetry is observed in decay involving tensor f_{2}(1270) resonance, and addition significant found π^{+}π^{-}S wave at low invariant mass. The presence related interference between P B^{+}→ρ(770)^{0}π^{+} also established; this causes local...
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$,...
We report the measurements of $CP$-violating parameters in $B_s^0 \to D_s^{\mp} K^{\pm}$ decays observed $pp$ collisions, using a data set corresponding to an integrated luminosity $3.0\,\text{fb}^{-1}$ recorded with LHCb detector. measure $C_f = 0.73 \pm 0.14 0.05$, $A^{\Delta \Gamma}_f 0.39 0.28 0.15$, \Gamma}_{\overline{f}} 0.31 $S_f -0.52 0.20 0.07$, $S_{\overline{f}} -0.49 where uncertainties are statistical and systematic, respectively. These used together world-average value $B_s^0$...
A bstract An angular analysis of the B 0 → K* e + − decay is performed using a data sample corresponding to an integrated luminosity 9 fb 1 pp collisions collected with LHCb experiment. The conducted in very low dielectron mass squared ( q 2 ) interval between . 0008 and 257 GeV , where rate dominated by K * γ transition virtual photon. fraction longitudinal polarisation meson, F L measured be = (4 4 ± 6 4)%, first uncertainty statistical second systematic. $$ {A}_{\mathrm{T}}^{\mathrm{Re}}...
A new baryon state is observed in the $$ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} mass spectrum with high significance using a data sample of pp collisions, collected LHCb detector at centre-of-mass energies \sqrt{s} = 7, 8 and 13 TeV, corresponding to an integrated luminosity 9 fb−1. The natural width are measured be {\displaystyle \begin{array}{l}m=6072.3\pm 2.9\pm 0.6\pm 0.2\ \mathrm{MeV},\\ {}\Gamma =72\pm 11\pm 2\ \mathrm{MeV},\end{array}} where first uncertainty statistical second...
The production of $B^+$, $B^0$ and $\Lambda_b^0$ hadrons is studied in proton-lead collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_\mathrm{NN}}=8.16\,{\rm TeV}$ recorded with the LHCb detector LHC. measurement uses dataset corresponding to an integrated luminosity $12.2\pm0.3\,\mathrm{nb}^{-1}$ for case where proton beam projected into (corresponding measuring hadron positive rapidity) $18.6\pm0.5\,\mathrm{nb}^{-1}$ lead negative rapidity). Nuclear effects are probed through...