I. Burducea
A5082754247- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Nuclear Physics and Applications
- Metal and Thin Film Mechanics
- Dark Matter and Cosmic Phenomena
- Fusion materials and technologies
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Materials and Properties
- Diamond and Carbon-based Materials Research
- Particle Accelerators and Free-Electron Lasers
- Ion-surface interactions and analysis
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Computational Physics and Python Applications
- Laser-Plasma Interactions and Diagnostics
- Plant Stress Responses and Tolerance
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2016-2025
Mississippi State University
2020
Centro Brasileiro de Pesquisas Físicas
2013
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2012-2013
University of Zurich
2013
European Organization for Nuclear Research
2011-2012
Max Planck Institute for Nuclear Physics
2012
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2012
We present a measurement of form-factor-independent angular observables in the decay ${B}^{0}\ensuremath{\rightarrow}{K}^{*}(892{)}^{0}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. The analysis is based on data sample corresponding to an integrated luminosity $1.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected by LHCb experiment $pp$ collisions at center-of-mass energy 7 TeV. Four are measured six bins dimuon invariant mass squared ${q}^{2}$ range...
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed with data collected in 2011 2012 LHCb experiment at Large Hadron Collider. The samples comprise $1.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of proton-proton collisions $\sqrt{s}=8\text{ }\mathrm{TeV}$ $1.0\text{ $\sqrt{s}=7\text{ }\mathrm{TeV}$. We...
The quantum numbers of the X(3872) meson are determined to be JPC = 1++ based on angular correlations in B+ K+ decays, where pi+pi- J/psi and \mu+\mu-. data correspond 1.0 fb-1 pp collisions collected by LHCb detector. only alternative assignment allowed previous measurements, JPC=2-+, is rejected with a confidence level equivalent more than eight Gaussian standard deviations using likelihood-ratio test full phase space. This result favors exotic explanations state.
A search for the rare decays ${B}_{s}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ is performed at LHCb experiment. The data analyzed correspond to an integrated luminosity of $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $pp$ collisions a center-of-mass energy 7 TeV $2\text{ 8 TeV. An excess signal candidates with respect background expectation seen...
Charm production at the LHC in pp collisions s=7TeV is studied with LHCb detector. The decays D0→K−π+, D+→K−π+π+, D⁎+→D0(K−π+)π+, Ds+→ϕ(K−K+)π+, Λc+→pK−π+, and their charge conjugates are analysed a data set corresponding to an integrated luminosity of 15 nb−1. Differential cross-sections dσ/dpT measured for prompt five charmed hadron species bins transverse momentum rapidity region 0<pT<8GeV/c 2.0<y<4.5. Theoretical predictions compared differential cross-sections. charm hadrons computed...
Abstract Using 34.7 pb −1 of data collected with the LHCb detector, inclusive production X (3872) meson in pp collisions at $\sqrt{s}=7\mbox{~TeV}$ is observed for first time. Candidates are selected (3872)→ J / ψπ + π − decay mode, and used to measure "Equation missing" where σ ( → (3872)+anything) cross section mesons rapidity range 2.5–4.5 transverse momentum 5–20 GeV/ c . In addition masses both ψ (2 S ) mesons, reconstructed final state, measured be $$m_{X(3872)} = 3871.95 \pm0.48 \...
The production of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy 7 TeV has been observed using an integrated luminosity $37.5 pb^{-1}$ collected with the LHCb detector. cross-section for both \jpsi rapidity range $2<y^{J/\psi}<4.5$ and transverse momentum $p_{T}^{J/\psi}<10 GeV/c$ is $$ \sigma^{J/\psi J/\psi} = 5.1\pm1.0\pm1.1 nb,$$ where first uncertainty statistical second systematic.
A bstract The relative production rate of $ B_s^0 and B 0 mesons is determined with the hadronic decays B_s^0\to D_s^{-}{\pi^{+}} → D − K + . measurement uses data corresponding to 1.0 fb −1 pp collisions at a centre-of-mass energy \sqrt{s}=7 TeV recorded in forward region LHCb experiment. ratio rates, f s /f d , measured be 238 ± 004 015 021, where first uncertainty statistical, second systematic, third theoretical. This combined previous obtain = 256 020. dependence on transverse momentum...
Using pp collision data corresponding to an integrated luminosity of 1.0 fb(-1) and collected by LHCb in 2011 at a center-of-mass energy 7 TeV, we report the measurement direct CP violation B(s)(0)→K(-)π(+) decays, A(CP)(B(s)(0)→K(-)π(+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is first observation decays B(s)(0) mesons. Furthermore, provide improved determination B(0)→K(+)π(-) A(CP)(B(0)→K(+)π(-)=-0.080±0.007 (stat)±0.003 which most precise this...
The angular distribution and differential branching fraction of the decay $B^{0} \to K^{*0} \mu^{+}\mu^{-}$ are studied using a data sample, collected by LHCb experiment in $pp$ collisions at $\sqrt{s}=7\,{\rm TeV}$, corresponding to an integrated luminosity $1.0\,{\rm fb}^{-1}$. Several observables measured bins dimuon invariant mass squared, $q^{2}$. A first measurement zero-crossing point forward-backward asymmetry system is also presented. be $q_{0}^{2} = 4.9 \pm 0.9 \,{\rm...
The time-dependent $CP$ asymmetry in ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}{K}^{\ensuremath{-}}$ decays is measured using $pp$ collision data at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$, corresponding to an integrated luminosity of $1.0\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected with the LHCb detector. decay-time distribution characterized by decay widths ${\ensuremath{\Gamma}}_{\mathrm{L}}$ and ${\ensuremath{\Gamma}}_{\mathrm{H}}$ light heavy mass eigenstates...
We present a measurement of the time-dependent $CP$-violating asymmetry in ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ decays, using data collected with LHCb detector at LHC. The decay time distribution is characterized by widths ${\ensuremath{\Gamma}}_{H}$ and ${\ensuremath{\Gamma}}_{L}$ heavy light mass eigenstates, respectively, ${B}_{s}^{0}\ensuremath{-}{\overline{B}}_{s}^{0}$ system phase ${\ensuremath{\phi}}_{s}$. In sample about 8500 events isolated from...
Using pp collision data corresponding to 1.0 fb(-1) integrated luminosity collected by the LHCb detector, two narrow states are observed in Λ(b)(0)π(+)π(-) spectrum with masses 5911.97±0.12(stat)±0.02(syst)±0.66(Λ(b)(0) mass) MeV/c(2) and 5919.77±0.08(stat)±0.02(syst)±0.66(Λ(b)(0) MeV/c(2). The significances of observations 5.2 10.2 standard deviations, respectively. These interpreted as orbitally excited Λ(b)(0) baryons, Λ(b)(*0)(5912) Λ(b)(*0)(5920).
The production of $J/\psi$ mesons accompanied by open charm, and pairs charm hadrons are observed in pp collisions at a centre-of-mass energy 7 TeV using an integrated luminosity $355pb^{-1}$ collected with the LHCb detector. Model independent measurements absolute cross-sections given together ratios to measured cross-sections. properties these events studied compared theoretical predictions.
The charmless decays $B^{\pm}\to K^{\pm}\pi^+\pi^-$ and K^{\pm}K^+K^-$ are reconstructed using data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by LHCb in 2011. inclusive charge asymmetries these modes measured as $A_{C\!P}(B^{\pm}\to K^{\pm}\pi^+\pi^-) = 0.032 \pm 0.008 \stat 0.004 \syst 0.007 (J\psi K^{\pm})$ K^{\pm}K^+K^-) -0.043 0.009 0.003 K^{\pm})$, where the third uncertainty is due $C\!P$ asymmetry J\psi K^{\pm}$ reference mode. significance K^{\pm}K^+K^-)$...
Received 13 March 2012DOI:https://doi.org/10.1103/PhysRevLett.108.129903This article is available under the terms of Creative Commons Attribution 3.0 License. Further distribution this work must maintain attribution to author(s) and published article’s title, journal citation, DOI.© 2012 American Physical Society
The production of Upsilon(1S), Upsilon(2S) and Upsilon(3S) mesons in proton-proton collisions at the centre-of-mass energy sqrt(s)=7 TeV is studied with LHCb detector. analysis based on a data sample 25 pb-1 collected Large Hadron Collider. Upsilon are reconstructed decay mode -> mu+ mu- signal yields extracted from fit to invariant mass distributions. differential cross-sections times dimuon branching fractions measured as function transverse momentum pT rapidity y, over range < 15 GeV/c...
Bottom baryons decaying to a J/ψ meson and hyperon are reconstructed using 1.0 fb(-1) of data collected in 2011 with the LHCb detector. Significant Λ(b)(0) → J/ψΛ, Ξ(b((-) J/ψΞ(-) Ω(b)(-) J/ψΩ(-) signals observed corresponding masses measured be M(Λ(b)(0))=5619.53 ± 0.13(stat.) 0.45(syst.) MeV/c(2), M(Ξ(b)(-)) = 5795.8 0.9(stat.) 0.4(syst.) M(Ω(b)(-)) 6046.0 2.2(stat.) 0.5(syst.) MeV/c(2) , while differences respect mass M(Ξ(b)(-))-M(Λ(b)(0))=176.2 0.1(syst.) M(Ω(b)(-))-M(Λ(b)(0))=426.4...
The angular distributions and the partial branching fraction of decay $B^{0} \rightarrow K^{*0} \mu^+ \mu^-$ are studied using an integrated luminosity $0.37\,fb^{-1}$ data collected with LHCb detector. forward-backward asymmetry muons, $A_{\mathrm{FB}}$, longitudinal polarisation, $F_{\mathrm{L}}$, fraction, $\mathrm{d}{\mathcal B}/\mathrm{d}q^{2}$, determined as a function dimuon invariant mass. measurements in good agreement Standard Model predictions most precise to date. In mass squared...
The decay ${\overline{B}}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ can be exploited to study $CP$ violation. A detailed understanding of its structure is imperative in order optimize usefulness. An analysis this three-body final state performed using a $1.0\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ sample data produced 7 TeV $pp$ collisions at the LHC and collected by LHCb experiment. modified Dalitz plot both...
The differential cross-section for the inclusive production of ψ(2S) mesons in pp collisions at $\sqrt{s}=7\ \mbox{TeV}$ has been measured with LHCb detector. data sample corresponds to an integrated luminosity 36 pb−1. are reconstructed decay channels ψ(2S)→μ + μ − and ψ(2S)→J/ψπ π −, J/ψ meson decaying into two muons. Results presented both promptly produced those originating from b-hadron decays. In kinematic range p T(ψ(2S))≤16 GeV/c 2<y(ψ(2S))≤4.5 we measure where last uncertainty on...
A bstract Measurements of inclusive W and Z boson production cross-sections in pp collisions at $ \sqrt {s} = 7\,{\text{TeV}} using final states containing muons are presented. The data sample corresponds to an integrated luminosity 37 pb −1 collected with the LHCb detector. bosons reconstructed from a transverse momentum above 20 GeV/c pseudorapidity between 2 . 0 4 5, and, case cross-section, dimuon invariant mass 60 120 measured be 831 ± 9 27 29pb for + , 656 8 19 23 − 76 7 1 3 7pb where...
The determination of the differential branching fraction and first angular analysis decay $B_s^0\to\phi\mu^{+}\mu^{-}$ are presented using data, corresponding to an integrated luminosity $1.0\,{\rm fb}^{-1}$, collected by LHCb experiment at $\sqrt{s}=7\,{\rm TeV}$. is determined in bins $q^{2}$, invariant dimuon mass squared. Integration over full $q^{2}$ range yields a total ${\cal B}(B_s^0\to\phi\mu^{+}\mu^{-}) = (7.07\,^{+0.64}_{-0.59}\pm 0.17 \pm 0.71)\times 10^{-7}$, where uncertainty...