A5101831032- 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
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Advancements in Battery Materials
- Nuclear physics research studies
- Superconducting Materials and Applications
- Graphene research and applications
- Distributed and Parallel Computing Systems
- Scientific Computing and Data Management
- Stochastic processes and statistical mechanics
- Advanced Data Storage Technologies
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Cosmology and Gravitation Theories
- International Science and Diplomacy
- Physics of Superconductivity and Magnetism
European Organization for Nuclear Research
2019-2025
The Alan Turing Institute
2022-2024
University of Oxford
2021-2024
Internet Society
2024
École Polytechnique Fédérale de Lausanne
2023
National Institute for Subatomic Physics
2021
University of Liverpool
2021
Cracow University of Technology
2021
AGH University of Krakow
2021
TU Dortmund University
2017-2021
An angular analysis of the B 0 → K *0(→ + π −)μ μ − decay is presented. The dataset corresponds to an integrated luminosity 3.0 fb−1 pp collision data collected at LHCb experiment. complete information from used determine CP-averaged observables and CP asymmetries, taking account possible contamination decays with system in S-wave configuration. their correlations are reported bins q 2, invariant mass squared dimuon system. determined both unbinned maximum likelihood fit by using principal...
A test of lepton universality, performed by measuring the ratio branching fractions $B^{0} \rightarrow K^{*0}\mu^{+}\mu^{-}$ and K^{*0}e^{+}e^{-}$ decays, $R_{K^{*0}}$, is presented. The $K^{*0}$ meson reconstructed in final state $K^{+}\pi^{-}$, which required to have an invariant mass within 100$\mathrm{\,MeV}c^2$ known $K^{*}(892)^{0}$ mass. analysis using proton-proton collision data, corresponding integrated luminosity about 3$\mathrm{\,fb}^{-1}$, collected LHCb experiment at...
The $\Xi_c^+ K^-$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity 3.3 fb$^{-1}$, collected by the LHCb experiment. $\Xi_c^+$ reconstructed in decay mode $p K^- \pi^+$. Five new, narrow excited $\Omega_c^0$ states are observed: $\Omega_c(3000)^0$, $\Omega_c(3050)^0$, $\Omega_c(3066)^0$, $\Omega_c(3090)^0$, and $\Omega_c(3119)^0$. Measurements their masses widths reported.
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...
The first full amplitude analysis of $B^+\to J/ψϕK^+$ with $J/ψ\toμ^+μ^-$, $ϕ\to K^+K^-$ decays is performed a data sample 3 fb$^{-1}$ $pp$ collision collected at $\sqrt{s}=7$ and $8$ TeV the LHCb detector. cannot be described by model that contains only excited kaon states decaying into $ϕK^+$, four $J/ψϕ$ structures are observed, each significance over $5$ standard deviations. quantum numbers these determined least $4$ lightest has mass consistent with, but width much larger than, previous...
Searches are performed for both prompt-like and long-lived dark photons, $A^{\prime}$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using $A^{\prime}\to\mu^+\mu^-$ decays data sample corresponding to an integrated luminosity 1.6 fb$^{-1}$ collected with the LHCb detector. The $A^{\prime}$ search covers mass range from near dimuon threshold up 70 GeV, while is restricted low-mass region $214<m(A^{\prime})<350$ MeV. No evidence signal found, 90% confidence level...
The data sample of Λ0b→J/ψpK− decays acquired with the LHCb detector from 7 and 8 TeV pp collisions, corresponding to an integrated luminosity 3 fb−1, is inspected for presence J/ψp or J/ψK− contributions minimal assumptions about K−p contributions. It demonstrated at more than nine standard deviations that cannot be described alone, play a dominant role in this incompatibility. These model-independent results support previously obtained model-dependent evidence P+c→J/ψp...
A full amplitude analysis of $\Lambda_b^0 \to J/\psi p \pi^-$ decays is performed with a data sample acquired the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integrated luminosity 3 fb$^{-1}$. significantly better description achieved when, in addition previously observed nucleon excitations $N\to p\pi^-$, either $P_c(4380)^+$ $P_c(4450)^+\to p$ states, K^-$ decays, or $Z_c(4200)^-\to state, reported $B^0 K^+ all three, are included models. The support model...
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...
A measurement of the differential branching fraction decay B 0 → K ∗(892)0 μ + − is presented together with a determination S-wave π system in +π− −. The analysis based on pp-collision data corresponding to an integrated luminosity 3 fb−1 collected LHCb experiment. measurements are made bins invariant mass squared dimuon system, q 2. Precise theoretical predictions for decays available 2 region 1.1 < 6.0 GeV2 /c 4. In this region, range 796 m Kπ 996 MeV/c 2, found be $$...
The first full amplitude analysis of $B^+\to J/ψϕK^+$ with $J/ψ\toμ^+μ^-$, $ϕ\to K^+K^-$ decays is performed a data sample 3 fb$^{-1}$ $pp$ collision collected at $\sqrt{s}=7$ and $8$ TeV the LHCb detector. cannot be described by model that contains only excited kaon states decaying into $ϕK^+$, four $J/ψϕ$ structures are observed, each significance over $5$ standard deviations. quantum numbers these determined least $4$ lightest has mass consistent with, but width much larger than, previous...
Measurements are presented of electroweak boson production using data from $pp$ collisions at a centre-of-mass energy $\sqrt{s} = 8\mathrm{\,Te\kern -0.1em V}$. The analysis is based on an integrated luminosity $2.0\mathrm{\,fb}^{-1}$ recorded with the LHCb detector. bosons identified in $W\rightarrow\mu\nu$ and $Z\rightarrow\mu^{+}\mu^{-}$ decay channels. cross-sections measured for muons pseudorapidity range $2.0 < \eta 4.5$, transverse momenta $p_{\rm T} > 20{\mathrm{\,Ge\kern V\!/}c}$...
From samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$, 8 and 13 TeV, corresponding to integrated luminosities 1.0, 2.0 $1.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, respectively, a peak in both ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{K}^{\ensuremath{-}}$ ${\mathrm{\ensuremath{\Xi}}}_{b}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ invariant mass spectra is observed. In quark model, radially orbitally excited...
Production cross-sections of prompt charm mesons are measured with the first data from pp collisions at LHC a centre-of-mass energy 13 TeV. The sample corresponds to an integrated luminosity 4.98 ± 0.19 pb−1 collected by LHCb experiment. production D 0, +, + , and *+ in bins meson transverse momentum, p T, rapidity, y, cover range 0 < T 15GeV/c 2.0 y 4.5. inclusive for four mesons, including charge conjugation, within 1 8 GeV/c found be $$ \begin{array}{l}\sigma \left( pp\to...
The Dalitz plot analysis technique is used to study the resonant substructures of ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays in a data sample corresponding $3.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $pp$ collision recorded by LHCb experiment during 2011 and 2012. A model-independent angular moments demonstrates presence resonances with spins 1, 2 3 at high...
A search for the rare decays $B_s^0\to\tau^+\tau^-$ and $B^0\to\tau^+\tau^-$ is performed using proton--proton collision data collected with LHCb detector. The sample corresponds to an integrated luminosity of 3fb$^{-1}$ in 2011 2012. $\tau$ leptons are reconstructed through decay $\tau^-\to\pi^-\pi^+\pi^-\nu_{\tau}$. Assuming no contribution from decays, upper limit set on branching fraction $\mathcal{B}(B_s^0\to\tau^+\tau^-) < 6.8\times 10^{-3}$ at 95% confidence level. If instead assumed,...
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...
Measurements of the cross section for producing b quarks in reaction pp→b¯bX are reported 7 and 13 TeV collisions at LHC as a function pseudorapidity η range 2<η<5 covered by acceptance LHCb experiment. The measurements done using semileptonic decays b-flavored hadrons decaying into ground-state charmed hadron association with muon. sections 72.0±0.3±6.8 154.3±1.5±14.3 μb TeV. ratio is 2.14±0.02±0.13, where quoted uncertainties statistical systematic, respectively. agreement theoretical...
The production cross-section of J/ψ pairs is measured using a data sample pp collisions collected by the LHCb experiment at centre-of-mass energy $$ \sqrt{s}=13 TeV, corresponding to an integrated luminosity 279 ±11 pb−1. measurement performed for mesons with transverse momentum less than 10 GeV/c in rapidity range 2.0 < y 4.5. be 15.2 ± 1.0 0.9 nb. first uncertainty statistical, and second systematic. differential cross-sections as functions several kinematic variables pair are compared...
Two-particle angular correlations are studied in proton-lead collisions at a nucleon–nucleon centre-of-mass energy of sNN=5TeV, collected with the LHCb detector LHC. The analysis is based on data recorded two beam configurations, which either direction proton or that lead ion analysed. measured laboratory system as function relative pseudorapidity, Δη, and azimuthal angle, Δϕ, for events different classes event activity bins particle transverse momentum. In high-activity long-range...
A bstract Measurements are reported of the central exclusive production J/ψ and ψ (2 S ) mesons in pp collisions at a centre-of-mass energy 13 TeV. Backgrounds significantly reduced compared to previous measurements made lower energies through use new forward shower counters. The products cross-sections branching fractions for decays dimuons, where both muons within pseudorapidity range 2 . 0 < η 4 5, measured be $$ \begin{array}{c}\hfill {\sigma}_{J/\psi \to {\mu}^{+}{\mu}^{-}} = 435 \pm...
A bstract The production cross-sections of ϒ (1 S ), (2 ) and (3 mesons in proton-proton collisions at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn></mml:math> TeV are measured with a data sample corresponding to an integrated luminosity 277 ± 11 pb −1 recorded by the LHCb experiment 2015. reconstructed decay mode → μ + − . differential times dimuon branching fractions as function...
A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies 7 8 TeV, corresponding to integrated luminosities 1 2 $$\,\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...