A5046985513- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Electron Spin Resonance Studies
- Ion channel regulation and function
- Cardiac electrophysiology and arrhythmias
- Genetics, Bioinformatics, and Biomedical Research
- Atomic and Subatomic Physics Research
- Electrochemical Analysis and Applications
- Dark Matter and Cosmic Phenomena
- Maternal and fetal healthcare
- Congenital Diaphragmatic Hernia Studies
- Silicon and Solar Cell Technologies
- Innovative Teaching Methods
- Neuroscience and Neuropharmacology Research
- Medical Imaging Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- DNA and Nucleic Acid Chemistry
- Molecular Sensors and Ion Detection
- Supramolecular Chemistry and Complexes
Miami University
2022-2025
Saint Mary's University of Minnesota
2025
Colorado State University
2022
Planned Parenthood
2022
University of Glasgow
2005-2020
Institute for Learning Innovation
2020
University of Minnesota Rochester
2018-2020
Centro Brasileiro de Pesquisas Físicas
2013
European Organization for Nuclear Research
2005-2012
Hartford Hospital
2003
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 Vertex Locator (VELO) is a silicon microstrip detector that surrounds the proton-proton interaction region in LHCb experiment. performance of during first years its physics operation reviewed. system operated vacuum, uses bi-phase CO2 cooling system, and sensors are moved to 7 mm from LHC beam for data taking. stability these characteristic features described, details material budget given. calibration timing processing algorithms implemented FPGAs described. fully characterised. have...
The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector LHC. differential cross-section for prompt measured as a function transverse momentum pT and rapidity y fiducial region 0<pT<14 GeV/c 2.0<y<4.5. fraction from b-hadron decays are also same ranges. analysis based on data sample corresponding to an integrated luminosity 5.2pb-1. cross-sections over 10.52 +/- 0.04 1.40 +1.64/-2.20 mub 1.14 0.01 0.16 decays, where first uncertainty...
During 2011 the LHCb experiment at CERN collected 1.0 fb−1 of $\sqrt{s} = 7\mbox{~TeV}$ pp collisions. Due to large heavy quark production cross-sections, these data provide unprecedented samples flavoured hadrons. The first results from have made a significant impact on flavour physics landscape and definitively proved concept dedicated in forward region hadron collider. This document discusses implications measurements classes extensions Standard Model, bearing mind interplay with searches...
A search for Bs -> mu+ mu- and B0 decays is performed using 1.0 fb^-1 of pp collision data collected at \sqrt{s}=7 TeV with the LHCb experiment Large Hadron Collider. For both number observed events consistent expectation from background Standard Model signal predictions. Upper limits on branching fractions are determined to be BR(Bs mu-) < 4.5 (3.8) x 10^-9 BR(B0 (0.81) 95% (90%) confidence level.
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 $$m_{X(3872)} = 3871.95 \pm0.48 \...
Measurements of $b$ hadron production ratios in proton-proton collisions at a centre-of-mass energy 7 TeV with an integrated luminosity 3 pb$^{-1}$ are presented. We study the strange $B$ meson to light $f_s/(f_u+f_d)$ and $\Lambda_b^0$ baryon $f_{\Lambda_b}/(f_u+f_d)$ as function charmed hadron-muon pair transverse momentum $p_T$ pseudorapidity $\eta$, for between 0 14 GeV $\eta$ 2 5. find that is consistent being independent $p_{\rm T}$ we determine = 0.134$\pm$ 0.004 $^{+0.011}_{-0.010}$,...
The production of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy 7 TeV has been observed using an integrated luminosity $37.5 pb^{-1}$ collected with the LHCb detector. cross-section for both \jpsi rapidity range $2<y^{J/\psi}<4.5$ and transverse momentum $p_{T}^{J/\psi}<10 GeV/c$ is $$ \sigma^{J/\psi J/\psi} = 5.1\pm1.0\pm1.1 nb,$$ where first uncertainty statistical second systematic.
Decays of b hadrons into final states containing a D0 meson and muon are used to measure the anti-b production cross-section in proton-proton collisions at centre-of-mass energy 7 TeV LHC. In pseudorapidity interval 2 < eta 6 integrated over all transverse momenta we find that average produce b-flavoured or anti-b-flavoured is (75.3 +/- 5.4 13.0) microbarns.
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...
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.
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...
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...
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced violation B_s system. fit pi+ pi- mass spectrum interfering resonances gives R_{f0/phi} = [Gamma(Bs f0, f0 pi-)]/[Gamma(Bs phi, phi K+K-)] 0.252^{+0.046+0.027}_{-0.032-0.033}, where uncertainties are statistical and systematic, respectively.
We report a measurement of the time-dependent ratio D0->K+pi- to D0->K-pi+ decay rates in D*+-tagged events using 1.0 fb^{-1} integrated luminosity recorded by LHCb experiment. measure mixing parameters x'2=(-0.9+-1.3)x10^{-4}, y'=(7.2+-2.4)x10^{-3} and doubly-Cabibbo-suppressed Cabibbo-favored R_D=(3.52+-0.15)x10^{-3}, where uncertainties include statistical systematic sources. The result excludes no-mixing hypothesis with probability corresponding 9.1 standard deviations represents first...
The interference between the K+ K- S-wave and P-wave amplitudes in B(s)(0) → J/ψK+ decays with pairs region around ϕ(1020) resonance is used to determine variation of difference strong phase these as a function invariant mass. Combined results from our CP asymmetry measurement J/ψϕ decays, we conclude that mass eigenstate almost = +1 lighter faster than -1. This determines sign decay width ΔΓ(s) ≡ Γ(L) - Γ(H) be positive. Our result also resolves ambiguity past measurements violating ϕ(s)...
Measurements of ${B}_{c}^{+}$ production and mass are performed with the decay mode ${B}_{c}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}$ using $0.37\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected in $pp$ collisions at $\sqrt{s}=7\text{ }\mathrm{TeV}$ by LHCb experiment. The ratio cross section times branching fraction between ${B}^{+}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}$ decays is measured to be...
A measurement of the cross-section for pp->Z->e+e- is presented using data at sqrt{s}=7TeV corresponding to an integrated luminosity 0.94 fb^{-1}. The process measured within kinematic acceptance pT>20GeV/c and 2<\eta<4.5 daughter electrons dielectron invariant mass in range 60--120GeV/c^2. determined be \sigma(pp->Z->e+e-)=76.0+-0.8+-2.0+-2.6pb where first uncertainty statistical, second systematic third luminosity. performed as a function Z rapidity angular variable which closely related...