A5068166502- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Scientific Computing and Data Management
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Nuclear and radioactivity studies
- Advanced Data Storage Technologies
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Radiation Effects in Electronics
- Muon and positron interactions and applications
Max Planck Institute for Physics
2011-2023
Ludwig-Maximilians-Universität München
2016-2023
Universitat de Barcelona
2018-2023
Johannes Gutenberg University Mainz
2023
Technical University of Munich
2023
Halbleiterlabor of the Max-Planck-Society
2023
Charles University
2023
Instituto de Física de Cantabria
2023
Deutsches Elektronen-Synchrotron DESY
2016-2022
University of the Basque Country
2013-2020
The full event interpretation is presented: a new exclusive tagging algorithm used by the high-energy physics experiment Belle II. experimental setup of II allows precise measurement otherwise inaccessible B meson decay modes. Full Event Interpretation enables many these measurements. relies on machine learning to automatically identify plausible chains based data recorded detector. Compared similar algorithms employed previous experiments, provides greater efficiency, yielding larger...
We report measurements of the branching fractions and direct CP asymmetries (A_{CP}) for B->K pi, pi KK decays (but not pi^0 pi^0) based on final data sample 772x10^6 B B-bar pairs collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e^+ e^- collider. set a 90% confidence-level upper limit K^+- K^-+ 2.0x10^{-7}; all other are observed ranging from 10^{-6} to 10^{-5}. In $B^0/B^0-bar -> K^+-\pi^-+ mode, we confirm Belle's previously reported large A_{CP} value -0.069...
We report measurements of branching fractions $\tau$ lepton decays to final states with a $K^{0}_{S}$ meson using 669 fb$^{-1}$ data sample accumulated the Belle detector at KEKB asymmetric-energy $e^{+}e^{-}$ collider. The inclusive fraction is measured be $\mathcal{B}(\tau^{-} \to K^{0}_{S}\ X^{-} \nu_{\tau})=(9.15 \pm 0.01 0.15) \times 10^{-3}$, where $X^{-}$ can anything; exclusive are \pi^{-} K^{0}_{S} \nu_{\tau}) = (4.16 0.08) K^{-} (7.40 0.07 0.27) 10^{-4}$, \pi^{0} (1.93 0.02 0.07)...
The dark photon ${A}^{\ensuremath{'}}$ and the Higgs boson ${h}^{\ensuremath{'}}$ are hypothetical constituents featured in a number of recently proposed sector models. Assuming prompt decays both particles, we search for their production so-called Higgstrahlung channel ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{A}^{\ensuremath{'}}{h}^{\ensuremath{'}}$, with ${h}^{\ensuremath{'}}\ensuremath{\rightarrow}{A}^{\ensuremath{'}}{A}^{\ensuremath{'}}$. We investigate ten exclusive final...
Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( "Image missing"<!-- image only, no MathML or LaTex -->) mesons at Belle II. The provide essential inputs for measurements mixing and charge-parity violation. validate evaluate performance using hadronic --> decays with flavor-specific final states reconstructed in a data set corresponding an integrated luminosity 62.8 fb $$^{-1}$$ <mml:math...
Modern high-energy physics (HEP) enterprises, such as the Belle II experiment at KEK laboratory in Japan, create huge amounts of data. Sophisticated algorithms for simulation, reconstruction, visualization, and analysis are required to fully exploit potential these We describe core components software that provide foundation development complex their efficient application on large data sets.
The DEPFET collaboration develops highly granular, ultra-transparent active pixel detectors for high-performance vertex reconstruction at future collider experiments. characterization of detector prototypes has proven that the key principle, integration a first amplification stage in detector-grade sensor material, can provide comfortable signal to noise ratio over 40 thickness 50-75 $\mathrm{\mathbf{\mu m}}$. ASICs have been designed and produced operate with required read-out speed. A...
The first observation of muonium (${\ensuremath{\mu}}^{+}{e}^{\ensuremath{-}}$) in vacuum, produced when a low-energy positive muon beam impinges on thin foil target, is reported. It found that ${\ensuremath{\mu}}^{+}{e}^{\ensuremath{-}}$ emerges from the surface predominantly with energies less than 20 keV. results show Clinton P. Anderson Meson Physics Facility stopped-muon channel operating at $E=4.0$ MeV an average flux...
A new experiment studying radiative pion decay, ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\nu}}_{e}\ensuremath{\gamma}$ has been performed with the Crystal Box detector at Clinton P. Anderson Meson Physics Facility (LAMPF). From a maximum-likelihood analysis of Dalitz-plot distribution 2364 coincident and random events, we obtain unique value for $\ensuremath{\gamma}$, ratio axial-vector to vector weak form factors, 0.25 \ifmmode\pm\else\textpm\fi{} 0.12. The world...
A bstract We search for CP violation in the decay ${D^{+}}\to K_S^0{K^{+}}$ using a data sample with an integrated luminosity of 977 fb −1 collected Belle detector at KEKB e + − asymmetric-energy collider. No has been observed and asymmetry is measured to be (−0.25 ± 0.28 0.14)%, which most sensitive measurement date. After subtracting due ${K^0}-{{\overline{K}}^0}$ mixing, {{\overline{K}}^0}{K^{+}}$ found (+0.08 0.14)%.
We present a measurement of the branching fraction and time-dependent CP violation parameters in B0 --> a_1^+-(1260) pi^-+ decays. The results are obtained from final data sample containing 772x10^6 BBbar pairs collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e^+e^- collider. also measure an upper limit on product for possible decay same state a_2^+-(1320) pi^-+. In to extract asymmetries, we find evidence mixing-induced decays 3.1 sigma significance rate where...
Using a sample of 158 million \Upsilon(2S) events collected with the Belle detector, charmonium and charmonium-like states even charge parity are searched for in radiative decays. No significant \chi_{cJ} or \eta_c signal is observed following upper limits at 90% confidence level (C.L.) obtained: BR(\Upsilon(2S)\to \gamma \chi_{c0})< 1.0 \times 10^{-4}, BR(\Upsilon(2S) \to \chi_{c1})<3.6 10^{-6}, \chi_{c2})<1.5 10^{-5}, \eta_c)< 2.7 10^{-5}. any state observed, we obtain \BR(\Upsilon(2S)\to...
We study B- meson decays to pbar Lambda D(*)0 final states using a sample of 657 * 10^6 B Bbar events collected at the Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e+ e- collider. The observed branching fraction for D0 is (1.43^ +0.28_-0.25 +- 0.18)*10^-5. significance 8.1 standard deviations, where uncertainties are statistical and systematic, respectively. Most signal have pbarLambda mass peaking near threshold. No significant D*0 corresponding upper limit on 4.8 10^-5...
Using a sample of 158 million $\Upsilon(2S)$ events collected with the Belle detector, we search for first time double charmonium decays $P$-wave spin-triplet bottomonium states ($\Upsilon(2S) \to \gamma \chi_{bJ}$, $\chi_{bJ} \jpsi \jpsi$, $\jpsi \psp$, $\psp \psp$ J=0, 1, and 2). No significant $\chi_{bJ}$ signal is observed in mass spectra, obtain following upper limits, $\BR(\chi_{bJ} \jpsi)<7.1\times 10^{-5}$, $2.7\times $4.5\times \psp)<1.2\times 10^{-4}$, $1.7\times $4.9\times \psp...
We report measurements of the branching fractions and $CP$ asymmetries for ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}\ensuremath{\eta}{h}^{\ifmmode\pm\else\textpm\fi{}}$ ($h=K$ or $\ensuremath{\pi}$) observation decay ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{0}$ from final data sample $772\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }B\overline{B}$ pairs collected with Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider....
Abstract We present the novel implementation of a non-differentiable metric approximation and corresponding loss-scheduling aimed at search for new particles unknown mass in high energy physics experiments. call loss-scheduling, based on minimisation figure-of-merit related function typical particle physics, Punzi-loss function, neural network that utilises this loss Punzi-net. show Punzi-net outperforms standard multivariate analysis techniques generalises well to hypotheses which it was...
We report new measurements of the production cross sections pairs charged pions and kaons as a function their fractional energies using various fractional-energy definitions. Two different definitions were used compared to conventional definition reported previously. The variables aim at either identifying dihadron in terms single-hadron fragmentation functions, or provide means characterizing transverse momentum created process. results obtained applying updated initial-state radiation...
We report a measurement of the branching fraction decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}(1020)$, evidence and for ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{f}_{2}^{\ensuremath{'}}(1525)$, determination total ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}{K}^{\ensuremath{-}}$ fraction, including resonant nonresonant contributions to ${K}^{+}{K}^{\ensuremath{-}}$ channel. also determine $S$-wave contribution within...
The process e+e−→γχcJ (J=1, 2) is studied via initial state radiation using 980 fb−1 of data at and around the Υ(nS) (n=1, 2, 3, 4, 5) resonances collected with Belle detector KEKB asymmetric-energy e+e− collider. No significant signal observed except from ψ(2S) decays. Upper limits on cross sections between √s=3.80 5.56 GeV are determined 90% credibility level, which range a few pb to tens pb. We also set upper decay rate vector charmonium [ψ(4040), ψ(4160), ψ(4415)] charmoniumlike...
We report branching fraction measurements of the decays ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ and ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ based on $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected near $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle experiment at KEKB asymmetric-energy...