A5011409083- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Stochastic processes and statistical mechanics
- CCD and CMOS Imaging Sensors
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Astrophysics and Cosmic Phenomena
- International Science and Diplomacy
- Markov Chains and Monte Carlo Methods
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Algorithms and Data Compression
Centre de physique des particules de Marseille
2020-2025
Aix-Marseille Université
2021-2025
Centre National de la Recherche Scientifique
2018-2025
Sorbonne Paris Cité
2018-2021
Laboratoire de Physique Nucléaire et de Hautes Énergies
2018-2021
Université Paris Cité
2018-2021
Sorbonne Université
2018-2021
Délégation Paris 7
2018-2021
University of British Columbia
2014-2021
Johannes Gutenberg University Mainz
2016-2021
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu \rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of using an existing beamline Paul Scherrer Institute (PSI) is designed reach a single event sensitivity $2\cdot 10^{-15}$. We present overview all aspects technical design and expected performance phase~I detector. high rate up $10^{8}$ muon decays per second low momenta electrons positrons pose unique set challenges, which we tackle...
A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is agreement with standard model prediction and improves test electron-muon universality to level 0.1%.
A search for massive neutrinos has been made in the decay $\pi\rightarrow e^+ \nu$. No evidence was found extra peaks positron energy spectrum indicative of pion decays involving ($\pi\rightarrow \nu_h$). Upper limits (90 \% C.L.) on neutrino mixing matrix element $|U_{ei}|^2$ mass region 60--135 MeV/$c^2$ were set, which are %representing an order magnitude improvement over previous results.
We describe a fully GPU-based implementation of the first level trigger for upgrade LHCb detector, due to start data taking in 2021. demonstrate that our implementation, named Allen, can process 40 Tbit/s rate upgraded detector and perform wide variety pattern recognition tasks. These include finding trajectories charged particles, proton-proton collision points, identifying particles as hadrons or muons, displaced decay vertices long-lived particles. further Allen be implemented around 500...
In the present work of PIENU experiment, heavy neutrinos were sought in pion decays π+→μ+ν at rest by examining observed muon energy spectrum for extra peaks addition to expected peak a light neutrino. No evidence was observed. Upper limits set on neutrino mixing matrix |Uμi|2 mass region 15.7–33.8 MeV/c2, improving previous results an order magnitude.
The three body pion decays ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{l}^{+}\ensuremath{\nu}X(l=e,\ensuremath{\mu})$, where $X$ is a weakly interacting neutral boson, were searched for using the full data set from PIENU experiment. An improved limit on $\mathrm{\ensuremath{\Gamma}}({\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}X)/\mathrm{\ensuremath{\Gamma}}({\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}})$...
Mu3e is a novel experiment searching for charged lepton flavor violation in the rare decay μ → eee. In order to reduce background by up 16 orders of magnitude, vertex position, time and particle momenta have be measured precisely. A pixel tracker based on 50 μm thin high voltage monolithic active sensors (HV-MAPS) magnetic field will deliver precise momentum information. Test beam results like an excellent efficiency >99.5% resolution better than 16.6 ns obtained with MuPix HV-MAPS chip...
High voltage CMOS (HVCMOS) sensors are presently considered for the use in Mu3e experiment, ATLAS and CLIC. These can be implemented commercial HVCMOS processes. feature fast charge collection by drift high radiation tolerance. The sensor element is an n-well/p-type diode. This proceeding-paper gives overview of projects recent results.
The MuPix7 chip is a monolithic HV-CMOS pixel chip, thinned down to 50 \mu m. It provides continuous self-triggered, non-shuttered readout at rates up 30 Mhits/chip of 3x3 mm^2 active area and size 103x80 m^2. hit efficiency depends on the chosen working point. Settings with power consumption 300 mW/cm^2 allow for >99.5%. A time resolution 14.2 ns (Gaussian sigma) achieved. Latest results from 2016 test beam campaigns are shown.
The MuPix Telescope is a particle tracking telescope, optimized for low momentum particles at high rates. It based on the novel High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), designed Mu3e detector. telescope represents first application of HV-MAPS technology and also serves as test bed readout chain. consists up to eight layers newest prototypes, MuPix7 sensors, which send self-triggered data via fast serial links FPGAs, where time-ordered sent PC. A hit rate 1 MHz per layer could...
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. first phase is currently under construction at Paul Scherrer Institute (PSI, Switzerland), where beams up 10$^8$ muons per second are available. detector will consist an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements....
The Mu3e experiment searches for the lepton flavour violating decay μ+ → e+e−e+, aiming to achieve a sensitivity of 2 · 10−15 in its first phase and ultimately aspiring final 10−16. During experiment, muon rate ∼ 108 μ/s will be available, resulting data 80 Gbit/s. trigger-less readout system is based on optical links switching FPGAs sending complete detector time slice one node filter farm. A full online reconstruction necessary reduce manageable amount written disk. Graphics processing...
Charged lepton flavor violating muon decay ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}{X}_{H}$, where ${X}_{H}$ is a massive neutral boson, was sought by searching for extra peaks in the ${\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ energy spectrum ${m}_{{X}_{H}}$ mass region $47.8--95.1\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. No signal found and 90% confidence level upper limits were set on branching ratio...
As high energy physics experiments reach higher luminosities and intensities, the computing burden for real time data processing reduction grows. Following developments in landscape, multi-core processors such as graphics units (GPUs) are increasingly used tasks. These proceedings provide an introduction to GPU architecture describe how it maps common tasks processing. In addition, specific use cases of GPUs trigger systems five different presented.
Real-time data processing is one of the central processes particle physics experiments which require large computing resources. The LHCb (Large Hadron Collider beauty) experiment will be upgraded to cope with a bunch collision rate 30 million times per second, producing $10^9$ particles/s. 40 Tbits/s need processed in real-time make filtering decisions store data. This poses challenge that requires exploration modern hardware and software solutions. We present Compass, tracking algorithm...
The Mu3e experiment searches for the lepton flavour violating decay μ → eee, aiming at a branching ratio sensitivity of 10−16. A high precision tracking detector combined with timing detectors will measure momenta, vertices and products more than 10 muons/s stopped in target. trigger-less readout system deliver about 100 GB/s data. implementation 3D algorithm on GPU is presented usage online event selection. Together vertex fit this allow reduction output data rate to below MB/s.
The rare pion decays ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\nu}}_{e}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ are allowed in the Standard Model but highly suppressed. These were searched for using data from PIENU experiment. A first result...
The upgraded LHCb detector, due to start datataking in 2022, will have process an average data rate of 4 TB/s real time. Because LHCb’s physics objectives require that the full detector information for every LHC bunch crossing is read out and made available real-time processing, this bandwidth challenge equivalent ATLAS CMS HL-LHC software read-out, but deliverable five years earlier. Over past six years, collaboration has undertaken a bottom-up rewrite its infrastructure, pattern...
Real-time data processing is a central aspect of particle physics experiments with high requirements on computing resources. The LHCb experiment must cope the 30 million proton-proton bunches collision per second rate Large Hadron Collider (LHC), producing $10^9$ particles/s. large input 32 Tb/s needs to be processed in real time by trigger system, which includes both reconstruction and selection algorithms reduce number saved events. system implemented two stages deployed custom centre. We...