D. Greenwald
A5041319387- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- Advanced NMR Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Effects in Electronics
- Scientific Computing and Data Management
- Nuclear Physics and Applications
- Nuclear physics research studies
- Spacecraft Design and Technology
- International Science and Diplomacy
- Atomic and Subatomic Physics Research
Technical University of Munich
2015-2023
Max Planck Institute for Physics
2012-2023
Campbell Collaboration
2022-2023
Charles University
2023
Instituto de Física de Cantabria
2023
Universitat de Barcelona
2023
Johannes Gutenberg University Mainz
2023
Ludwig-Maximilians-Universität München
2015-2023
Halbleiterlabor of the Max-Planck-Society
2023
University of Bonn
2016-2022
We report the first measurement of $\ensuremath{\tau}$ lepton polarization ${P}_{\ensuremath{\tau}}({D}^{*})$ in decay $\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}}$ as well a new ratio branching fractions...
We report a measurement of the ratio ${\cal R}(D^*) = {\cal B}(\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau})/{\cal \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or muon. The results are based on data sample containing $772\times10^6$ $B\bar{B}$ pairs recorded at $\Upsilon(4S)$ resonance with Belle detector KEKB $e^+ e^-$ collider. select $B^0 \bar{B}^0$ by reconstructing both $B$ mesons in semileptonic decays to $D^{*\mp} \ell^{\pm}$. measure R}(D^*)= 0.302 \pm...
The experimental results on the ratios of branching fractions R(D)=B(B[over ¯]→Dτ^{-}ν[over ¯]_{τ})/B(B[over ¯]→Dℓ^{-}ν[over ¯]_{ℓ}) and R(D^{*})=B(B[over ¯]→D^{*}τ^{-}ν[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}), where ℓ denotes an electron or a muon, show long-standing discrepancy with standard model predictions, might hint at violation lepton flavor universality. We report new simultaneous measurement R(D) R(D^{*}), based data sample containing 772×10^{6} BB[over ¯] events recorded ϒ(4S) resonance...
We present a measurement of ${R}_{{K}^{*}}$, the branching fraction ratio $\mathcal{B}(B\ensuremath{\rightarrow}{K}^{*}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})/\mathcal{B}(B\ensuremath{\rightarrow}{K}^{*}{e}^{+}{e}^{\ensuremath{-}})$, for both charged and neutral $B$ mesons. The case ${R}_{{K}^{*+}}$ is first ever performed. In addition, we report absolute fractions individual modes in bins squared dilepton invariant mass ${q}^{2}$. analysis based on data sample $711\text{...
We present measurements of the branching fractions for decays $B\to K \mu^{+}\mu^{-}$ and e^{+}e^{-}$, their ratio ($R_{K}$), using a data sample 711 $fb^{-1}$ that contains $772 \times 10^{6}$ $B\bar{B}$ events. The were collected at $\Upsilon(4S)$ resonance with Belle detector KEKB asymmetric-energy $e^{+}e^{-}$ collider. $R_{K}$ is measured in five bins dilepton invariant-mass-squared ($q^{2}$): $q^{2} \in (0.1, 4.0), (4.0, 8.12), (1.0, 6.0)$, $(10.2, 12.8)$ ($>14.18) GeV^{2}/c^{4}$,...
We present a determination of the magnitude Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ using decay $B\to D\ell\nu_\ell$ ($\ell=e,\mu$) based on 711 fb$^{-1}$ $e^+e^-\to \Upsilon(4S)$ data recorded by Belle detector and containing $772 \times 10^6$ $B\bar{B}$ pairs. One $B$ meson in event is fully reconstructed hadronic mode while other, signal side, partially from charged lepton either $D^+$ or $D^0$ total 23 modes. The isospin-averaged branching fraction found to be...
We present a measurement of angular observables, $P_4'$, $P_5'$, $P_6'$, $P_8'$, in the decay $B^0 \to K^\ast(892)^0 \ell^+ \ell^-$, where $\ell^+\ell^-$ is either $e^+e^-$ or $\mu^+\mu^-$. The analysis performed on data sample corresponding to an integrated luminosity $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at $\Upsilon(4S)$ resonance with Belle detector asymmetric-energy collider KEKB. Four $P_{4,5,6,8}'$ are extracted five bins invariant mass...
Using the entire Belle data sample of 980 ${\rm fb}^{-1}$ $e^+e^-$ collisions, we present results a study excited $\Omega_c$ charmed baryons in decay mode $\Xi_c^+K^-$. We show confirmation four five narrow states reported by LHCb Collaboration: $\Omega_c(3000)$ , $\Omega_c(3050)$, $\Omega_c(3066)$, and $\Omega_c(3090)$.
We present a search for the direct production of light pseudoscalar decaying into two photons with Belle II detector at SuperKEKB collider. process e^{+}e^{-}→γa, a→γγ in mass range 0.2<m_{a}<9.7 GeV/c^{2} using data corresponding to an integrated luminosity (445±3) pb^{-1}. Light pseudoscalars interacting predominantly standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated extensions model. find no evidence ALPs and set 95% confidence level upper...
Using data collected with the Belle detector at KEKB asymmetric-energy $e^+e^-$ collider, we measure energy dependence of $e^+e^- \to h_b(nP)\pi^+\pi^-$ $(n=1,2)$ cross sections from thresholds up to $11.02\,$GeV. We find clear $\Upsilon(10860)$ and $\Upsilon(11020)$ peaks little or no continuum contribution. study resonant substructure $\Upsilon(11020) transitions evidence that they proceed entirely via intermediate isovector states $Z_b(10610)$ $Z_b(10650)$. The relative fraction these is...
We report the first measurement of $D^{\ast -}$ meson polarization in decay $B^0 \to D^{*-} \tau^+\nu_{\tau}$ using full data sample 772$\times 10^6$ $B\bar{B}$ pairs recorded with Belle detector at KEKB electron-positron collider. Our result, $F_L^{D^\ast} = 0.60 \pm 0.08 ({\rm stat}) 0.04 sys})$, where $F_L^{D^\ast}$ denotes $D^{\ast-}$ longitudinal fraction, agrees within about $1.7$ standard deviations model prediction.
Using data recorded with the Belle detector, we observe a new excited hyperon, an Ω^{*-} candidate decaying into Ξ^{0}K^{-} and Ξ^{-}K_{S}^{0} mass of 2012.4±0.7(stat)±0.6(syst) MeV/c^{2} width Γ=6.4_{-2.0}^{+2.5}(stat)±1.6(syst) MeV. The is seen primarily in ϒ(1S),ϒ(2S), ϒ(3S) decays.
We present the first measurements of absolute branching fractions ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}$ decays into ${\mathrm{\ensuremath{\Xi}}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, $\mathrm{\ensuremath{\Lambda}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, and $p{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ final states. The are made using a dataset comprising $(772\ifmmode\pm\else\textpm\fi{}11)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected...
Belle II is an experiment operating at the intensity frontier. Over next decades, it will record decay of billions bottom mesons, charm hadrons, and tau leptons produced in 10 GeV electron-positron collisions SuperKEKB high-luminosity collider KEK. These data, collected low-background kinematically known conditions, allow us to measure hundreds parameters that test standard model (SM) probe for existence new particles, mass scales orders magnitudes higher than those studied energy We project...
We report the first observation of decay $\Lambda^{+}_{c} \rightarrow p K^{+} \pi^{-}$ using a 980 $\mathrm{fb^{-1}}$ data sample collected by Belle detector at KEKB asymmetric-energy $e^{+}e^{-}$ collider. This is doubly Cabibbo-suppressed charmed baryon to be observed. measure branching ratio this with respect its Cabibbo-favored counterpart $\mathcal{B}(\Lambda^{+}_{c} \pi^{-})/\mathcal{B}(\Lambda^{+}_{c} K^{-} \pi^{+})=(2.35\pm0.27\pm0.21)\times10^{-3}$, where uncertainties are...
We report the first measurement of $τ$ lepton polarization in decay ${\bar B} \rightarrow D^* τ^- {\barν_τ}$ as well a new ratio branching fractions $R(D^{*}) = \mathcal{B}({\bar {\barν_τ}) / \ell^- {\barν_{\ell}})$, where $\ell^-$ denotes an electron or muon, with decays $τ^- π^- ν_τ$ and ρ^- ν_τ$. use full data sample $772 \times 10^6$ $B{\bar B}$ pairs accumulated Belle detector at KEKB electron-positron collider. Our preliminary results, $R(D^*) 0.276 \pm 0.034{\rm (stat.)} ^{+0.029}...
We search for the process ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ using full Belle data set of $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, corresponding to $772\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs, collected at $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. reconstruct one $B$ meson in a...
We present the measurement of absolute branching fractions ${B}^{+}\ensuremath{\rightarrow}{X}_{c\overline{c}}{K}^{+}$ and ${B}^{+}\ensuremath{\rightarrow}{\overline{D}}^{(*)0}{\ensuremath{\pi}}^{+}$ decays, using a data sample $772\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }B\overline{B}$ pairs collected at $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Here, ${X}_{c\overline{c}}$ denotes...
We present the result of search for rare $B$ meson decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}\ensuremath{\gamma}$ with $\ensuremath{\ell}=\mathrm{e},\ensuremath{\mu}$. For full data set recorded by Belle experiment $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity near $\mathrm{\ensuremath{\Upsilon}}(4\mathrm{S})$ resonance is used. Signal candidates are reconstructed photon energies ${E}_{\ensuremath{\gamma}}$...
We report the first evidence for $X(3872)$ production in two-photon interactions by tagging either electron or positron final state, exploring highly virtual photon region. The search is performed ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, using $825\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected Belle detector operated at KEKB ${e}^{+}{e}^{\ensuremath{-}}$...
We report inclusive and exclusive measurements for ${\ensuremath{\chi}}_{c1}$ ${\ensuremath{\chi}}_{c2}$ production in $B$ decays. measure $\mathcal{B}(B\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}X)=(3.03\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.24(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$...
A bstract We report a measurement of the electric dipole moment τ lepton ( dτ ) using an 833 fb − 1 data sample collected near Υ(4 S resonance, with Belle detector at KEKB asymmetric-energy e + collider. Using optimal observable method, we obtain real and imaginary parts d as Re( = 0 . 62 ± 63) × 10 17 cm Im( 40 32) cm, respectively. These results are consistent null present level experimental sensitivity improve by about factor three.