B. Meadows
A5048566973- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Stochastic processes and statistical mechanics
- Cosmology and Gravitation Theories
- International Science and Diplomacy
- Astrophysics and Cosmic Phenomena
- Advanced Data Storage Technologies
- Advanced NMR Techniques and Applications
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Electron and X-Ray Spectroscopy Techniques
- Radioactive Decay and Measurement Techniques
University of Cincinnati
2016-2025
Uppsala University
2024
Institute of Nuclear Physics, Polish Academy of Sciences
2023
University of Maryland, College Park
2023
University of Oxford
2013-2015
European Organization for Nuclear Research
2015
TU Dortmund University
2013-2014
Syracuse University
2013
Centro Brasileiro de Pesquisas Físicas
2013
Campbell Collaboration
1997-2013
We search for evidence of a light scalar boson in the radiative decays Upsilon(2S) and Upsilon(3S) resonances: Upsilon(2S,3S)-->gammaA0, A0-->mu+mu-. Such particle appears extensions standard model, where CP-odd Higgs naturally couples strongly to b quarks. find no such processes mass range 0.212 < or = mA0 9.3 GeV samples 99 x 10(6) 122 collected by BABAR detector at SLAC PEP-II B factory set stringent upper limits on effective coupling quark A0. also limit dimuon branching fraction etab...
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected with the BABAR detector at PEP-II collider, an center-of-mass energy 10.6 GeV. From analysis invariant mass spectrum, dependence cross section for measured from threshold to 4.5 ratio electric and magnetic form factors, |G_E/G_M|, asymmetry in proton angular distribution are masses below 3 We also measure branching fractions decays J/psi psi(2S) anti p.
We report the results of a search for $Z(4430)^-$ decay to $J/\psi\pi^-$ or $\psi(2S)\pi^-$ in $B^{-,0}\to \jpsi\pi^- K^{0,+}$ and \psitwos \pi^- decays. The data were collected with BABAR detector at SLAC PEP-II asymmetric-energy $e^+e^-$ collider operating center mass energy 10.58 \gev, sample corresponds an integrated luminosity 413 fb$^{-1}$. Each $K\pi$ distribution exhibits clear $K^{\ast}(892)$ $K^{\ast}_2(1430)$ signals, efficiency-corrected spectrum is well-described by...
We report the results of a study exclusive charmless semileptonic decays, B^0 --> pi^- l^+ nu, B^+ pi^0 omega eta nu and eta^' (l = e or mu) undertaken with approximately 462x10^6 B\bar{B} pairs collected at Upsilon(4S) resonance BABAR detector. The analysis uses events in which signal B decays are reconstructed loose neutrino reconstruction technique. obtain partial branching fractions several bins q^2, square momentum transferred to lepton-neutrino pair, for nu. From these distributions,...
We present measurements of Collins asymmetries in the inclusive process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}X$, where $\ensuremath{\pi}$ stands for charged pions, at a center-of-mass energy 10.6 GeV. use data sample $468\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by BABAR experiment PEP-II $B$ factory SLAC, and consider pairs pions produced opposite hemispheres hadronic events. observe clear distributions azimuthal angles two...
We observe the decays ${D}_{s1}^{*}(2710{)}^{+}\ensuremath{\rightarrow}{D}^{*}K$ and ${D}_{sJ}^{*}(2860{)}^{+}\ensuremath{\rightarrow}{D}^{*}K$ measure their branching fractions relative to $DK$ final state. also observe, in ${D}^{*}K$ mass spectrum, a new broad structure at of $(3044\ifmmode\pm\else\textpm\fi{}{8}_{\mathrm{stat}}(\genfrac{}{}{0}{}{+30}{\ensuremath{-}5}{)}_{\mathrm{syst}})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ having width...
We perform a study of the exclusive production $D\overline{D}$, ${D}^{*}$$\overline{D}$, and ${D}^{*}{\overline{D}}^{*}$ in initial-state-radiation events, from ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at center-of-mass energy near 10.58 GeV, to search for charmonium possible new resonances. The data sample corresponds an integrated luminosity $384\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ was recorded by BABAR experiment PEP-II storage rings. ${D}^{*}\overline{D}$, mass spectra...
A precise measurement of the cross section for process e+e−→K+K−(γ) from threshold to an energy 5 GeV is obtained with initial-state radiation (ISR) method using 232 fb−1 data collected BABAR detector at e+e− center-of-mass energies near 10.6 GeV. The uses effective ISR luminosity determined e+e−→μ+μ−(γ)γISR same set. corresponding lowest-order contribution hadronic vacuum polarization term in muon magnetic anomaly found be aμKK,LO=(22.93±0.18stat±0.22syst)×10−10. charged kaon form factor...
The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}$ cross section and the proton magnetic form factor have been measured in center-of-mass energy range from 3.0 to 6.5 GeV using initial-state radiation technique with an undetected photon. This is first measurement of at energies higher than 4.5 GeV. analysis based on $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity collected BABAR detector PEP-II collider ${e}^{+}{e}^{\ensuremath{-}}$ near 10.6...
Inclusive production cross sections of $\pi^\pm$, $K^\pm$ and $p\bar{p}$ per hadronic $e^+e^-$ annihilation event in are measured at a center-of-mass energy 10.54 GeV, using relatively small sample very high quality data from the BaBar experiment PEP-II $B$-factory SLAC National Accelerator Laboratory. The drift chamber Cherenkov detector provide clean samples identified over wide range momenta. Since is below threshold to produce $B\bar{B}$ pair, with $B$ bottom-quark meson, these represent...
We present the first direct measurements of pion valence-quark momentum distribution which is related to square light-cone wave function. The were carried out using data on diffractive dissociation $500\mathrm{GeV}/c$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ into dijets from a platinum target at Fermilab experiment E791. results show that $|q\overline{q}〉$ asymptotic function describes well for ${Q}^{2}\ensuremath{\sim}10(\mathrm{GeV}/c{)}^{2}$ or more. also measured transverse dijets.
Semileptonic $\overline{B}$ decays to $DX\ensuremath{\ell}\overline{\ensuremath{\nu}}$ ($\ensuremath{\ell}=e$ or $\ensuremath{\mu}$) are selected by reconstructing ${D}^{0}\ensuremath{\ell}$ and ${D}^{+}\ensuremath{\ell}$ combinations from a sample of $230\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ recorded with the BABAR detector at PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider SLAC. A global fit these samples in...
We present a Dalitz plot analysis of charmless B± decays to the final state π±π±π∓ using sample (465±5)×106 B¯¯¯B pairs collected by BABAR experiment at √s=10.58 GeV. measure branching fractions B(B±→π±π±π∓)=(15.2±0.6±1.2±0.4)×10−6, B(B±→ρ0(770)π±)=(8.1±0.7±1.2+0.4−1.1)×10−6, B(B±→f2(1270)π±)=(1.57±0.42±0.16+0.53−0.19)×10−6, and B(B±→π±π±π∓ nonresonant)=(5.3±0.7±0.6+1.1−0.5)×10−6, where uncertainties are statistical, systematic, model-dependent, respectively. Measurements for modes...
We report the measurement of Cabibbo-Kobayashi-Maskawa $CP$-violating angle $\ensuremath{\gamma}$ through a Dalitz plot analysis neutral $D$-meson decays to ${K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}_{S}^{0}{K}^{+}{K}^{\ensuremath{-}}$ produced in processes ${B}^{\ensuremath{\mp}}\ensuremath{\rightarrow}D{K}^{\ensuremath{\mp}}$, ${B}^{\ensuremath{\mp}}\ensuremath{\rightarrow}{D}^{*}{K}^{\ensuremath{\mp}}$ with...
We present a search for the lepton flavor violating decay modes ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{h}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\tau}\ensuremath{\ell}$ ($h=K$, $\ensuremath{\pi}$; $\ensuremath{\ell}=e$, $\ensuremath{\mu}$) using BABAR data sample, which corresponds to $472\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs. The uses events where one $B$ meson is fully reconstructed in of several hadronic final states. Using momenta $B$,...
We present a search for the decay $\B^+ \to \ell^+ \nu_{\ell} (\ell = \tau, \mu, \mathrm{or} e)$ in $(458.9 \pm 5.1) \times 10^{6}$ $\Upsilon(4S)$ decays recorded with Babar detector at SLAC PEP-II $B$-Factory. A sample of events one reconstructed exclusive semi-leptonic B ($B^{-}\to D^{0} \ell^{-}\bar{\nu} X$) is selected, and recoil \nu_{\ell}$ signal performed. The $\tau$ identified following channels: $\tau^+ e^+ \nu_e \overline{\nu}_\tau$, \mu^+ \nu_{\mu} \overline{\nu}_{\tau}$, \pi^+...
We search for hadronic decays of a light Higgs boson (A0) produced in radiative an Upsilon(2S) or Upsilon(3S) meson, Upsilon --> gamma A0. The data have been recorded by the BABAR experiment at and center mass energies, include (121.3 \pm 1.2) x 10^6 (98.3 0.9) mesons. No significant signal is observed. set 90% confidence level upper limits on product branching fractions B(Upsilon(nS)-->gamma A0) B(A0-->hadrons) (n=2 3) that range from 1 10^{-6} A0 0.3 GeV/c^2 to 8 10^{-5} 7 GeV/c^2.
We search for di-muon decays of a low-mass Higgs boson (${A}^{0}$) produced in radiative $\ensuremath{\Upsilon}(1S)$ decays. The sample is selected by tagging the pion pair $\ensuremath{\Upsilon}(2S,3S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\Upsilon}(1S)$ transitions, using data $92.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(2S)$ and $116.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(3S)$...
We study the processes $e^+ e^-\to K_S^0 K_L^0 \gamma$, $K_S^0 \pi^+\pi^-\gamma$, and K^+K^-\gamma$, where photon is radiated from initial state, providing cross section measurements for hadronic states over a continuum of center-of-mass energies. The results are based on 469 fb$^{-1}$ data collected with BaBar detector at SLAC. observe $\phi(1020)$ resonance in K_L^0$ final state measure product its electronic width branching fraction about 3% uncertainty. present measurement $ energy range...
An angular analysis of the decay ${\overline{B} \rightarrow D^\ast \ell^- \overline{\nu}_\ell}$, $\ell\in\{e,\mu\}$, is reported using full $e^+e^-$ collision data set collected by \babar experiment at $\Upsilon(4S)$ resonance. One $B$ meson from ${\Upsilon(4S)\to B\overline{B}}$ fully reconstructed in a hadronic mode, which constrains kinematics and provides determination neutrino momentum vector. The semileptonic described di-lepton mass squared, $q^2$, three angles. first unbinned fit to...
We review some recent developments in charm meson physics. In particular, we discuss theoretical predictions and experimental measurements of charmed decays to leptonic, semileptonic, hadronic final states implications such searches for new D0-anti-D0-mixing CP-violation charm, future prospects challenges this area.
We report on a Dalitz plot analysis of ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays, based sample about $383\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4\mathrm{S})\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at PEP-II asymmetric-energy $B$ Factory SLAC. find total branching fraction three-body decay:...
We search for a light Higgs boson, $A^0$, in the radiative decay $\Upsilon(3S)\to\gamma A^0$, $A^0\to\tau^+\tau^-$, $\tau^+\to e^+\nu_e \bar{\nu}_{\tau}$ or \mu^+ \nu_{\mu} \bar{\nu}_{\tau}$. The data sample contains 122 million $\Upsilon(3S)$ events recorded with \babar detector. find no evidence narrow structure studied $\tau^+\tau^-$ invariant mass region of $4.03<m_{\tau^+\tau^-}<10.10$ \gevcc. exclude at 90% confidence level (C.L.) low decaying to product branching fraction ${\cal...
We search for invisible decays of the Υ(1S) meson using a sample 91.4×106 Υ(3S) mesons collected at BABAR/PEP-II B factory. select events containing decay Υ(3S)→π+π−Υ(1S) and evidence an undetectable recoiling against dipion system. set upper limit on branching fraction B(Υ(1S)→invisible)<3.0×10−4 90% confidence level.Received 20 August 2009DOI:https://doi.org/10.1103/PhysRevLett.103.251801©2009 American Physical Society