M. Clemencic
A5107841349- 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
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Advanced Data Storage Technologies
- Stochastic processes and statistical mechanics
- Scientific Computing and Data Management
- Radiation Detection and Scintillator Technologies
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Parallel Computing and Optimization Techniques
- Pulsars and Gravitational Waves Research
European Organization for Nuclear Research
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2004-2024
Tsinghua University
2023
École Polytechnique Fédérale de Lausanne
2011-2023
GANIL
2019
Centro Brasileiro de Pesquisas Físicas
2013-2018
University of Birmingham
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2004-2017
Institute of Particle Physics
2017
Charles University
2017
The LHCb simulation application, Gauss, is based on the Gaudi framework and experiment basic components such as Event Model Detector Description. Gauss also depends external libraries for generation of primary events (PYTHIA 6, EvtGen, etc.) GEANT4 particle transport in experimental setup. application supports production different types from minimum bias to B physics signals guns. It used purely generator-level studies well full simulations. both directly by users massive central productions...
This paper presents the design of LHCb trigger and its performance on data taken at LHC in 2011. A principal goal is to perform flavour physics measurements, designed distinguish charm beauty decays from light quark background. Using a combination lepton identification measurements particles' transverse momenta selects particles originating hadrons, which typically fly finite distance before decaying. The reduces roughly 11 MHz bunch-bunch crossings that contain least one inelastic pp...
The production of J/psi mesons in proton-proton collisions at sqrt(s)=7 TeV is studied with the LHCb detector LHC. differential cross-section for prompt measured as a function transverse momentum pT and rapidity y fiducial region 0<pT<14 GeV/c 2.0<y<4.5. fraction from b-hadron decays are also same ranges. analysis based on data sample corresponding to an integrated luminosity 5.2pb-1. cross-sections over 10.52 +/- 0.04 1.40 +1.64/-2.20 mub 1.14 0.01 0.16 decays, where first uncertainty...
Upgrades to the LHCb computing infrastructure in first long shutdown of LHC have allowed for high quality decay information be calculated by software trigger making a separate offline event reconstruction unnecessary. Furthermore, storage space triggered candidate is an order magnitude smaller than entire raw that would otherwise need persisted. Tesla, following renowned physicist naming convention, application designed process trigger, with resulting output used directly perform physics...
Particle physics has an ambitious and broad experimental programme for the coming decades. This requires large investments in detector hardware, either to build new facilities experiments, or upgrade existing ones. Similarly, it commensurate investment R&D of software acquire, manage, process, analyse shear amounts data be recorded. In planning HL-LHC particular, is critical that all collaborating stakeholders agree on goals priorities, efforts complement each other. this spirit, white paper...
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced violation B_s system. fit pi+ pi- mass spectrum interfering resonances gives R_{f0/phi} = [Gamma(Bs f0, f0 pi-)]/[Gamma(Bs phi, phi K+K-)] 0.252^{+0.046+0.027}_{-0.032-0.033}, where uncertainties are statistical and systematic, respectively.
With the steady increase in precision of flavour physics measurements collected during LHC Run 2, LHCb experiment requires simulated data samples larger and sizes to study detector response detail. The simulation is main contribution time needed simulate full events. This scales linearly with particle multiplicity. Of dozens particles present only few participating signal decay under are interest, while all remaining mainly affect resolutions efficiencies detector. paper presents a novel...
Since 2015, with the restart of LHC for its second run data taking, LHCb experiment has been empowered a dedicated computing model to select and analyse calibration samples measure performance particle identification (PID) detectors algorithms. The novel technique was developed within framework innovative trigger experiment, which relies on online event reconstruction most datasets, reserving offline special physics cases. strategy process samples, includes data-processing scheme combining...
The relative abundance of the three decay modes ${B}^{0}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{K}^{+}$, ${B}^{0}\ensuremath{\rightarrow}{D}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, and ${B}_{s}^{0}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ produced in 7 TeV $pp$ collisions at LHC is determined from data corresponding to an integrated luminosity $35\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. branching fraction...
The cross-section for inclusive phi meson production in pp collisions at a centre-of-mass energy of sqrt(s) = 7 TeV has been measured with the LHCb detector Large Hadron Collider. differential is as function transverse momentum p_T and rapidity y region 0.6 < 5.0 GeV/c 2.44 4.06. this kinematic range sigma(pp -> X) 1758 pm 19(stat) ^{+43}_{-14}(syst) 182(scale) microbarn, where first systematic uncertainty depends on second related to overall scale. Predictions based Pythia 6.4 generator...
After ten years from its first version, the Gaudi software framework underwent many changes and improvements with a subsequent increase of code base. Those were almost always introduced preserving backward compatibility reducing as much possible in itself; obsolete has been removed only rarely. release targeted to data taking 2008, it decided have review aim general consolidation view 2009. We also take occasion introduce those never implemented because big impact they on rest code, needed...
The Large Hadron Collider (LHC), the world's largest and highest-energy particle accelerator, designed to collide opposing beams of protons or lead ions, started its operations in September 2008 at European Organization for Nuclear Research (CERN) Geneva, Switzerland. To process analyze huge amounts data generated by four experiments installed different collision points along LHC ring, a large distributed computing infrastructure has been set up, Computing Grid (LCG). bulk this data,...
The LCG Persistency Framework consists of three software packages (CORAL, COOL and POOL) that address the data access requirements LHC experiments in several different areas. project is result collaboration between CERN IT Department (ATLAS, CMS LHCb) are using some or all components to their data. POOL a hybrid technology store for C++ objects, mixture streaming relational technologies implement both object persistency metadata catalogs collections. CORAL an abstraction layer with SQL-free...
The Persistency Framework consists of three software packages (CORAL, COOL and POOL) addressing the data access requirements LHC experiments in different areas. It is result collaboration between CERN IT Department (ATLAS, CMS LHCb) that use this to their data. POOL a hybrid technology store for C++ objects, metadata catalogs collections. CORAL relational database abstraction layer with an SQL-free API. provides specific tools components handling conditions This paper reports on status...
The high data rates at the LHC necessitate use of biasing selections already trigger level. Consequently, correction biases induced by these becomes one main challenges for analyses. This paper presents LHCb implementation a driven method extracting such which entirely avoids uncertainties associated with detector simulation. Its novelty lies in is implemented software, allowing its decisions to be reproduced an exact manner offline. It demonstrated that this allows control selection better...
HEP experiments produce enormous data sets at an ever-growing rate. To cope with the challenge posed by these sets, experiments' software needs to embrace all capabilities modern CPUs offer. With decreasing memory/core ratio, one-process-per-core approach of recent years becomes less feasible. Instead, multi-threading fine-grained parallelism be exploited benefit from memory sharing among threads.
The necessity for thread-safe experiment software has recently become very evident, largely driven by the evolution of CPU architectures towards exploiting increasing levels parallelism. For high-energy physics this represents a real paradigm shift, as concurrent programming was previously only limited to special, well-defined domains like control or framework internals. This however, falls into middle successful LHC programme and many million lines code have already been written without...
The LHCb experiment is resuming operation in Run3 after a major upgrade. New software exploiting modern technologies for all data processing and the underlying core framework part of simulation framework, Gauss, had to be adapted accordingly, with additional constraint that it also relies on external libraries. At same time, decision was taken consolidate extract generic components into new experiment-independent called Gaussino. This allows easier prototyping testing where only elements are...
The Conditions Database (CondDB) of the LHCb experiment provides versioned, time dependent geometry and conditions data for all processing applications (simulation, high level trigger (HLT), reconstruction, analysis) in a heterogeneous computing environment ranging from user laptops to HLT farm Grid. These different use cases impose front-end support multiple database technologies (Oracle SQLite are used). Sophisticated distribution tools required ensure timely robust delivery updates...
CORAL and COOL are two software packages used by the LHC experiments for managing detector conditions other types of data using relational database technologies. They have been developed maintained within LCG Persistency Framework, a common project CERN IT department with ATLAS, CMS LHCb. This presentation reports on status at time CHEP2013, covering new features enhancements in both packages, as well changes improvements process infrastructure. It also reviews usage outlook ongoing future...
In the LHCb experiment a wide variety of Monte Carlo simulated samples needs to be produced for experiment's physics program. productions are handled centrally similarly all massive processing data in experiment. order cope with large set different types simulation samples, necessary procedures based on common infrastructures have been up numerical event type identification code used throughout. The various elements procedure, from writing configuration an deploying them production...