A5053899618- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Advanced X-ray Imaging Techniques
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Computational Drug Discovery Methods
- Radiation Effects in Electronics
- Big Data and Business Intelligence
- Machine Learning and Data Classification
- Scientific Research and Discoveries
- Data Quality and Management
Apple (Germany)
2023
Karlsruhe Institute of Technology
2016-2023
University of Bonn
2021
University of Cincinnati
2021
Heidelberg University
2005
Time series feature engineering is a time-consuming process because scientists and engineers have to consider the multifarious algorithms of signal processing time analysis for identifying extracting meaningful features from series. The Python package tsfresh (Time Series FeatuRe Extraction on basis Scalable Hypothesis tests) accelerates this by combining 63 characterization methods, which default compute total 794 features, with selection automatically configured hypothesis tests. By...
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...
A search for the flavor-changing neutral-current decay B^{+}→K^{+}νν[over ¯] is performed at Belle II experiment SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63 fb^{-1} collected ϒ(4S) resonance and a 9 60 MeV below resonance. Because measurable signature involves only single charged kaon, novel measurement approach used that exploits not properties decay, but also inclusive other B meson in ϒ(4S)→BB[over event, suppress...
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.
The precise determination of the CKM matrix element $\left| V_{cb}\right|$ is important for carrying out tests flavour sector Standard Model. In this article we present a preliminary analysis $\bar B^0 \to D^{*\,+} \, \ell^- \bar ν_\ell$ decay mode and its charge conjugate, selected in events that contain fully reconstructed $B$-meson, using 772 million $e^+ e^- Υ(4S) B B$ recorded by Belle detector at KEKB. Unfolded differential rates four kinematic variables describing $B$-meson rest frame...
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.
We report the result for a search leptonic decay of B+→μ+νμ using full Belle dataset 711 fb−1 integrated luminosity at Υ(4S) resonance. In Standard Model B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct second B meson produced in collision. The directional information from this boost observed μ into signal rest frame, which has monochromatic momentum spectrum. Though its smeared by experimental...
Abstract From April to July 2018, a data sample at the peak energy of resonance was collected with Belle II detector SuperKEKB electron-positron collider. This is first experiment. Using Bhabha and digamma events, we measure integrated luminosity be ( , where uncertainty statistical second systematic. work provides basis for future measurements II.
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 ${E}_{\ensuremath{\gamma}}$...
Charged particle track reconstruction is a major component of data-processing in high-energy physics experiments such as those at the Large Hadron Collider (LHC), and foreseen to become more challenging with higher collision rates. A simplified two-dimensional version problem set up on collaborative platform, RAMP, order for developers prototype test new ideas. small-scale competition was held during Connecting The Dots / Intelligent Trackers 2017 (CTDWIT 2017) workshop. Despite short time...
The enhancement of charged-particle pairs with large pseudorapidity difference and small azimuthal angle difference, often referred to as the ``ridge signal'', is a phenomenon widely observed in high multiplicity proton-proton, proton-ion deutron-ion collisions, which not yet fully understood. In heavy-ion hydrodynamic expansion Quark-Gluon Plasma one possible explanations origin ridge signal. Measurements $e^+e^-$ collision system, without complexities introduced by hadron structure initial...
We report a measurement of the D^{0} and D^{+} lifetimes using D^{0}→K^{-}π^{+} D^{+}→K^{-}π^{+}π^{+} decays reconstructed in e^{+}e^{-}→cc[over ¯] data recorded by Belle II experiment at SuperKEKB asymmetric-energy e^{+}e^{-} collider. The data, collected center-of-mass energies or near ϒ(4S) resonance, correspond to an integrated luminosity 72 fb^{-1}. results, τ(D^{0})=410.5±1.1(stat)±0.8(syst) fs τ(D^{+})=1030.4±4.7(stat)±3.1(syst) fs, are most precise date consistent with previous...
Conventional undulators are used in synchrotron light sources to produce radiation with a narrow relative spectral width as compared bending magnets or wigglers. The of the produced by conventional is determined number undulator periods and energy spread emittance electron beam. In more compact like for instance laser plasma accelerators becomes dominating factor. Due this effect these cannot general be high-gain free lasers (FELs). order overcome limitation, modified schemes, so-called...
Today's analyses for high-energy physics (HEP) experiments involve processing a large amount of data with highly specialized algorithms. The contemporary workflow from recorded to final results is based on the execution small scripts – often written in Python or ROOT macros which call complex compiled algorithms background perform fitting procedures and generate plots. During recent years interactive programming environments, such as Jupyter, became popular. Jupyter allows develop...
The GENFIT toolkit, initially developed at the Technische Universitaet Muenchen, has been extended and modified to be more general user-friendly. new GENFIT, called GENFIT2, provides track representation, track-fitting algorithms graphic visualization of tracks detectors, it can used for any experiment that determines parameters charged particle trajectories from spacial coordinate measurements. Based on Kalman filter routines, perform extrapolations covariance matrices. It also interfaces...
On March 25th 2019, the Belle II detector recorded first collisions delivered by SuperKEKB accelerator. This marked beginning of physics run with vertex detector. The was aligned initially cosmic ray tracks without magnetic field simultaneously drift chamber. alignment method is based on Millepede and General Broken Lines track model includes also muon system or primary position alignment. To control weak modes, we employ sensitive validation tools various samples can be used as input, from...
The 4th industrial revolution entails new levels of data driven value chain organization and management. In environments, the optimization whole production lines based on machine learning algorithms allow to generate huge business value. Still, one open challenges is how process collected as close sources possible. To fill this gap, paper presents an OpenTOSCA-based toolchain that capable automatically provisioning Apache Flink a holistic analytics environment altogether with specialized...
We measure the photon-energy spectrum in radiative bottom-meson ($B$) decays into inclusive final states involving a strange hadron and photon. use SuperKEKB electron-positron collisions corresponding to $189~\mathrm{fb}^{-1}$ of integrated luminosity collected at $Υ(4S)$ resonance by Belle II experiment. The partner $B$ candidates are fully reconstructed using large number hadronic channels. $B \rightarrow X_s γ$ partial branching fractions measured as function photon energy signal meson...
The Belle II experiment started to take data of electron–positron collisions provided by the SuperKEKB accelerator, with all subdetectors from March 2019. collected are selected a software-based high-level trigger (HLT) system and stored on online storage. After storing data, storage sends an express-reconstruction for semireal-time quality monitoring (DQM) event display. HLT is built ZeroMQ networking library, but ring buffer transmission control protocol/internet protocol (TCP/IP)...
We present a first measurement of the $\bar{B^{0}} \rightarrow D^{*+} \ell^{-} ν_{\ell}$ branching fraction using fully reconstructed $B$ meson decays employing Full Event Interpretation algorithm. Collision events corresponding to an integrated luminosity \lumi are analyzed, which were recorded by Belle~II detector operated at SuperKEKB accelerator complex. measure$\cal{B}(\bar{B^{0}} ν_{\ell}) =4.51 \pm 0.41_{stat}\pm0.27_{syst} \pm0.45_{π_s}$, with and second error denoting statistical...
The Belle II experiment is a high energy multi purpose particle detector operated at the asymmetric e+e− - collider SuperKEKB in Tsukuba (Japan). In this work we describe algorithm performing pattern recognition for inner tracking which consists of two layers pixel detectors and four double sided silicon strip arranged around interaction region. track finding will be used both during High Level Trigger on-line reconstruction off-line full reconstruction. It must provide good efficiency down...
We present the results of re-discovery decay $B^0 \to \pi^- \ell^+ \nu_\ell$ in 34.6 fb$^{-1}$ Belle II data using hadronic $B$-tagging via Full Event Interpretation algorithm. observe 21 signal events on a background 155 fit to distribution square missing mass, $M_{\mathrm{miss}}^2$, with significance 5.69$\sigma$, and determine total branching fraction (1.58 $\pm$ 0.43$_{\mathrm{stat}}$ 0.07$_{\mathrm{sys}}$) $\times 10^{-4}$.