G. Haefeli
A5026230027- 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
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Distributed and Parallel Computing Systems
- Stochastic processes and statistical mechanics
- Cosmology and Gravitation Theories
- Radiation Therapy and Dosimetry
- Advanced Radiotherapy Techniques
- International Science and Diplomacy
- Astrophysics and Cosmic Phenomena
- Markov Chains and Monte Carlo Methods
- Advanced NMR Techniques and Applications
- Advanced Data Storage Technologies
- Radioactive Decay and Measurement Techniques
École Polytechnique Fédérale de Lausanne
2016-2025
Czech Academy of Sciences, Institute of Physics
2018-2025
University of Zurich
2023
Petersburg Nuclear Physics Institute
2012-2021
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2021
University of Chinese Academy of Sciences
2020
Peking University
2020
State Key Laboratory of Nuclear Physics and Technology
2020
Central China Normal University
2020
Institute of High Energy Physics
2020
The Vertex Locator (VELO) is a silicon microstrip detector that surrounds the proton-proton interaction region in LHCb experiment. performance of during first years its physics operation reviewed. system operated vacuum, uses bi-phase CO2 cooling system, and sensors are moved to 7 mm from LHC beam for data taking. stability these characteristic features described, details material budget given. calibration timing processing algorithms implemented FPGAs described. fully characterised. have...
The performance of the LHCb Muon system and its stability across full 2010 data taking with LHC running at ps = 7 TeV energy is studied. optimization detector setting time calibration performed first collisions delivered by described. Particle rates, measured for wide range luminosities beam operation conditions experienced during run, are compared values expected from simulation. space alignment detectors, chamber efficiency, resolution cluster size evaluated. found to be as specifications...
Abstract SND@LHC is a compact and stand-alone experiment designed to perform measurements with neutrinos produced at the LHC in pseudo-rapidity region of 7.2 < η 8.4. The located 480 m downstream ATLAS interaction point, TI18 tunnel. detector composed hybrid system based on an 830 kg target made tungsten plates, interleaved emulsion electronic trackers, also acting as electromagnetic calorimeter, followed by hadronic calorimeter muon identification system. able distinguish interactions...
We report the direct observation of muon neutrino interactions with SND@LHC detector at Large Hadron Collider. A dataset proton-proton collisions sqrt[s]=13.6 TeV collected by in 2022 is used, corresponding to an integrated luminosity 36.8 fb^{-1}. The search based on information from active electronic components detector, which covers pseudorapidity region 7.2<η<8.4, inaccessible other experiments collider. Muon candidates are identified through their charged-current interaction topology, a...
The combination of small diameter scintillating plastic fibres with arrays SiPM photodetectors has led to a new class SciFi trackers usable at high luminosity collider experiments. After short review the main principles and history fibre technology, we describe challenges developments large area Scintillating Fibre Tracker currently under development for upgraded LHCb experiment.
Abstract CuboDAQ is a custom data acquisition system to read out SiPM-based detectors. It features electronic boards digitize the SiPMs signal, an FPGA-based system-on-module board, connectivity transmit central server, and all software necessary operate them. The front-end based on TOFPET2 ASIC, produced by PETsys, connected featuring Enclustra Mercury SA1 module with Cyclone V FPGA. Multiple can be operated synchronously distributing clock synchronous reset signals from source. complete...
The LHCb experiment at CERN has been upgraded for the Run 3 operation of Large Hadron Collider (LHC). A new concept tracking detector based on Scintillating Fibres (SciFi) read out with multichannel silicon photomultipliers (SiPMs) was installed during its upgrade. One main challenges SciFi tracker will face 4 LHC is higher radiation environment due to fast neutrons, where SiPMs are located. To cope increase in radiation, cryogenic cooling liquid nitrogen being investigated as a possible...
Abstract The Scattering and Neutrino Detector at the LHC (SND@LHC) started taking data beginning of Run 3 LHC. experiment is designed to perform measurements with neutrinos produced in proton-proton collisions an energy range between 100 GeV 1 TeV. It covers a previously unexplored pseudo-rapidity $$7.2<\eta <8.4$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>7.2</mml:mn> <mml:mo><</mml:mo> <mml:mi>η</mml:mi> <mml:mn>8.4</mml:mn> </mml:mrow>...
Six of the key physics measurements that will be made by LHCb experiment, concerning CP asymmetries and rare B decays, are discussed in detail. The "road map" towards precision is presented, including use control channels other techniques to understand performance detector with first data from LHC.
To develop a novel instrument for real-time quality assurance (QA) procedures in radiotherapy. The system implements scintillation-based phantom and associated signal acquisition processing modules aims to monitor two-dimensional (2D) dose distributions of small fields.For the proposed phantom, we have designed realized prototype implementing six high-resolution tissue-equivalent scintillating fiber ribbons stacked with in-plane 30° rotated orientations from each other. Each ribbon output is...
We report on a measurement of the flavor-specific $B^0_s$ lifetime and $D^-_s$ using proton-proton collisions at center-of-mass energies 7 8 TeV, collected by LHCb experiment corresponding to 3.0 $fb^{−1}$ integrated luminosity. Approximately 407 000 $B^0_s \to D^{(*)-}_s \mu^+\nu_{\mu}$ decays are partially reconstructed in $K^+ K^- \pi^- \mu^+$ final state. The natural widths determined using, as reference, kinematically similar same resulting differences between $B^0$ mesons $D^-$...
The LHCb experiment is one of the four large particle detectors currently under construction at LHC accelerator CERN. It a forward single-arm spectrometer dedicated to precision measurements CP violation and rare decays in b quark sector. In Standard Model arises via complex phase 3x3 CKM mixing matrix. will test unitarity this matrix by measuring several theoretically unrelated ways all angles sides triangle. This allow over-constrain model — hopefully exhibit inconsistencies which be...
Knowledge of the beam properties in proton therapy through monitoring is essential, ensuring an effective dose delivery to patient. In clinical practice, currently used interceptive ionisation chambers require daily calibration and suffer from a slow response time. A new non-invasive method for online under development based on silicon multi-strip sensor LHCb VELO (VErtex LOcator), originally experiment at CERN. The proposed relies halo measurements. Several changes system setup were...
For determining small-field profile and output factor during stereotactic radiotherapy quality assurance (QA) procedures, we propose a novel system based on the scintillating fiber (SciFi) detector with image acquisition processing to allow real-time monitoring of factor.