A5088926880- 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
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- CCD and CMOS Imaging Sensors
- Simulation Techniques and Applications
- Stochastic processes and statistical mechanics
- Mathematics, Computing, and Information Processing
- Cosmology and Gravitation Theories
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Markov Chains and Monte Carlo Methods
- Radio Astronomy Observations and Technology
European Organization for Nuclear Research
2016-2025
RWTH Aachen University
2023-2024
Universitat de Barcelona
2023
Universitat Ramon Llull
2023
École Polytechnique Fédérale de Lausanne
2023
University of Geneva
2017-2020
National Institute for Subatomic Physics
2011-2020
University of Chinese Academy of Sciences
2020
Central China Normal University
2014-2020
Tsinghua University
2020
The LHCb experiment is dedicated to precision measurements of CP violation and rare decays B hadrons at the Large Hadron Collider (LHC) CERN (Geneva). initial configuration expected performance detector associated systems, as established by test beam simulation studies, described.
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...
The LHCb Outer Tracker is a gaseous detector covering an area of 5x6 m2 with 12 double layers straw tubes. its services are described together the commissioning and calibration procedures. Based on data first LHC running period from 2010 to 2012, performance readout electronics single hit resolution efficiency presented. detect in central half estimated be 99.2%, position determined approximately 200 um. received dose hottest region corresponding 0.12 C/cm, no signs gain deterioration or...
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at weak scale. When produced experiments such as Large Hadron Collider (LHC) CERN, these long-lived (LLPs) decay far from interaction vertex of primary proton-proton collision. Such LLP signatures distinct those promptly decaying targeted by majority searches for new physics LHC, often requiring customized techniques identify, example, significantly displaced vertices, tracks with...
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.
This report summarizes the work of Energy Frontier Top Quark working group 2013 Community Summer Study (Snowmass).
The goal of this report is to give a comprehensive overview the rich field forward physics, with special attention topics that can be studied at LHC.The starts presenting selection Monte Carlo simulation tools currently available, chapter 2, then enters phenomenology QCD low, 3, and high, 4, momentum transfer, while unique scattering conditions central exclusive production are analyzed in 5.The last two experimental topics, Cosmic Ray Heavy Ion physics presented 6 7 respectively.Chapter 8...
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 HERSCHEL detector consists of a set scintillating counters, designed to increase the coverage LHCb experiment in high-rapidity regions on either side main spectrometer. new improves capabilities for studies diffractive interactions, most notably Central Exclusive Production. In this paper construction, installation, commissioning, and performance are presented.
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.
This manuscript describes the optimization of front-end readout electronics for high granularity hybrid pixel detectors. The theoretical study aims at minimizing noise and jitter. model presented here is validated with both circuit post layout simulations measurements on Timepix4 Application Specific Integrated Circuit (ASIC). analog procedure to optimize dimensions main transistors are described detail. most recent ASIC designed in framework Medipix4 Collaboration. It was manufactured 65 nm...
The LHCb VELO Upgrade I, currently being installed for the 2022 start of LHC Run 3, uses silicon microchannel coolers with internally circulating bi-phase \cotwo thermal control hybrid pixel modules operating in vacuum. This is largest scale application this technology to date. Production was completed July 2019 and assembly into cooling structures September 2021. paper describes R\&D path supporting production motivation design choices. have excellent peformance, low uniform mass, no...
2nd workshop on the implications of HERA for LHC physics. Working groups: Parton Density Functions Multi-jet final states and energy flows Heavy quarks (charm beauty) Diffraction Cosmic Rays Monte Carlos Tools
The calibration and performance of the LHCb Calorimeter system in Run 1 2 at LHC are described. After a brief description sub-detectors their role trigger, methods used for each part reviewed. changes which occurred with increase beam energy explained. performances calorimetry $\gamma$ $\pi^0$ detailed. A few results from collisions recorded $\sqrt {s}$ = 7, 8 13 TeV shown.
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...
Precise knowledge of the location material in LHCb vertex locator (VELO) is essential to reducing background searches for long-lived exotic particles, and identifying jets that originate from beauty charm quarks. Secondary interactions hadrons produced beam-gas collisions are used map VELO. Using this map, along with properties a reconstructed secondary its constituent tracks, $p$-value can be assigned hypothesis originates interaction. A validation procedure presented using photon...
Abstract The LHCb detector has undergone a major upgrade for LHC Run 3. This Upgrade I facilitates operation at higher luminosity and utilises full-detector information the collision rate, critically including use of vertex information. A new locator system, VELO Upgrade, been constructed. core element are double-sided pixelated hybrid silicon modules which operate in vacuum close to beam high radiation environment. construction quality assurance tests these described this paper. incorporate...