R. Oldeman

ORCID: 0000-0001-6902-0710
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About
Contact & Profiles
Research Areas
  • Particle physics theoretical and experimental studies
  • Quantum Chromodynamics and Particle Interactions
  • High-Energy Particle Collisions Research
  • Neutrino Physics Research
  • Dark Matter and Cosmic Phenomena
  • Particle Detector Development and Performance
  • Black Holes and Theoretical Physics
  • Computational Physics and Python Applications
  • Particle Accelerators and Free-Electron Lasers
  • Medical Imaging Techniques and Applications
  • Superconducting Materials and Applications
  • Atomic and Subatomic Physics Research
  • Astrophysics and Cosmic Phenomena
  • Nuclear physics research studies
  • Radiation Detection and Scintillator Technologies
  • Stochastic processes and statistical mechanics
  • Cosmology and Gravitation Theories
  • Particle accelerators and beam dynamics
  • Distributed and Parallel Computing Systems
  • International Science and Diplomacy
  • Muon and positron interactions and applications
  • Advanced NMR Techniques and Applications
  • Advanced Data Storage Technologies
  • Markov Chains and Monte Carlo Methods
  • Cold Atom Physics and Bose-Einstein Condensates

Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
2016-2025

University of Cagliari
2014-2025

Universitat Ramon Llull
2023-2024

Universitat de Barcelona
2023

Universidade de Santiago de Compostela
2022

European Organization for Nuclear Research
2011-2021

University of Chinese Academy of Sciences
2020

Peking University
2020

State Key Laboratory of Nuclear Physics and Technology
2020

Central China Normal University
2014-2020

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...

10.1088/1748-0221/8/02/p02022 article EN Journal of Instrumentation 2013-02-27

The performance of the muon identification in LHCb is extracted from data using muons and hadrons produced J/ψ → μ+μ−, Λ0 pπ− D⋆+→π+D0(K−π+) decays. procedure based on pattern hits chambers. A momentum dependent binary requirement used to reduce probability be misidentified as level 1%, keeping efficiency range 95-98%. As further refinement, a likelihood built for non-muon hypotheses. Adding this that provides total at 93%, hadron misidentification probabilities are below 0.6%.

10.1088/1748-0221/8/10/p10020 article EN cc-by Journal of Instrumentation 2013-10-17

The nuclear emulsion target of the CHORUS detector was exposed to wide-band neutrino beam CERN SPS 27 GeV average energy from 1994 1997. In total, about 100 000 charged-current (CC) interactions with at least one identified muon were located in and fully reconstructed, using newly developed automated scanning systems. Charmed particles searched for by a program recognizing particle decays. observation decay makes it possible select sample very low background minimal kinematical bias. all,...

10.1088/1367-2630/13/9/093002 article EN cc-by New Journal of Physics 2011-09-01

We present a leading order QCD analysis of sample neutrino induced charged-current events with two muons in the final state originating lead-scintillating fibre calorimeter CHORUS detector. The results are based on 8910 and 430 antineutrino opposite-sign dimuon collected during exposure detector to CERN Wide Band Neutrino Beam between 1995 1998. yields value charm quark mass mc=(1.26±0.16±0.09)GeV/c2 ratio strange non-strange sea nucleon κ=0.33±0.05±0.05, improving obtained similar analyses...

10.1016/j.nuclphysb.2008.02.013 article EN cc-by Nuclear Physics B 2008-02-22

During the years 1994–1997, emulsion target of CHORUS detector was exposed to Wide Band Neutrino Beam from CERN-SPS. About 170 000 neutrino interactions were successfully located in emulsion. Improvements automatic scanning systems and application different criteria allowed sample events be used for studies charm production. We present a measurement production rate D0 mesons based on 25 693 νμ charged-current (CC) analysed so far. After reconstruction event topology vertex region, 283 decays...

10.1016/s0370-2693(02)01173-5 article EN cc-by Physics Letters B 2002-02-01

The muon detector of LHCb, which comprises 1368 multi-wire-proportional-chambers (MWPC) for a total area 435 m2, is the largest instrument its kind exposed to such high-radiation environment. In nine years operation, from 2010 until 2018, we did not observe appreciable signs ageing in terms reduced performance. However, during long period, many chamber gas gaps suffered HV trips. Most trips were due Malter-like effects, characterised by appearance local self-sustained high currents,...

10.1088/1748-0221/14/11/p11031 article EN cc-by Journal of Instrumentation 2019-11-27

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 $D^-$...

10.5167/uzh-146413 article EN Physical Review Letters 2017-05-12

Muon identification is of paramount importance for the physics programme LHCb. In upgrade phase, starting from Run 3 LHC, trigger experiment will be solely based on software. The luminosity increase to 2×1033 cm−2s−1 require an improvement muon criteria, aiming at performances equal or better than those 2, but in a much more challenging environment. this paper, two new algorithms developed view \lhcb are presented, and their performance terms signal efficiency versus background reduction shown.

10.1088/1748-0221/15/12/t12005 article EN cc-by Journal of Instrumentation 2020-12-10
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