D. Hoffmann

ORCID: 0000-0001-5209-5265
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About
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Research Areas
  • Particle physics theoretical and experimental studies
  • High-Energy Particle Collisions Research
  • Quantum Chromodynamics and Particle Interactions
  • Particle Detector Development and Performance
  • Dark Matter and Cosmic Phenomena
  • Astrophysics and Cosmic Phenomena
  • Neutrino Physics Research
  • Cosmology and Gravitation Theories
  • Gamma-ray bursts and supernovae
  • Computational Physics and Python Applications
  • Distributed and Parallel Computing Systems
  • Radiation Detection and Scintillator Technologies
  • Black Holes and Theoretical Physics
  • Radio Astronomy Observations and Technology
  • Particle Accelerators and Free-Electron Lasers
  • Muon and positron interactions and applications
  • Laser Design and Applications
  • Solid State Laser Technologies
  • advanced mathematical theories
  • Semiconductor Lasers and Optical Devices
  • Astrophysical Phenomena and Observations
  • Medical Imaging Techniques and Applications
  • Astronomy and Astrophysical Research
  • Semiconductor Quantum Structures and Devices
  • Nuclear reactor physics and engineering

Aix-Marseille Université
2015-2024

Centre National de la Recherche Scientifique
2015-2024

Centre de physique des particules de Marseille
2009-2024

Universitat de Barcelona
2024

Institut d'Estudis Espacials de Catalunya
2024

Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2001-2023

TU Dortmund University
2023

University of Turku
2023

Niels Brock
2023

University of Copenhagen
2014-2023

The silicon pixel tracking system for the ATLAS experiment at Large Hadron Collider is described and performance requirements are summarized. Detailed descriptions of detector electronics sensors given. design, fabrication, assembly modules presented. Data obtained from test beams as well studies using cosmic rays also discussed.

10.1088/1748-0221/3/07/p07007 article EN Journal of Instrumentation 2008-07-24

A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral charged current $$e^{\pm }p$$ scattering zero beam polarisation. The data were taken proton energies 920, 820, 575 460 GeV an electron energy 27.5 GeV. correspond to integrated luminosity about 1 fb $$^{-1}$$ span six orders magnitude in negative four-momentum-transfer squared, $$Q^2$$ , Bjorken x. correlations systematic uncertainties evaluated...

10.1140/epjc/s10052-015-3710-4 article EN cc-by The European Physical Journal C 2015-12-01

Cross sections for elastic and proton-dissociative photoproduction of J/ψ mesons are measured with the H1 detector in positron-proton collisions at HERA. The data were collected ep centre-of-mass energies $\sqrt{s}\approx318~\mathrm{GeV}$ $\sqrt {s}\approx225 \ \mbox{GeV}$ , corresponding to integrated luminosities $\mathcal{L} = 130~\mbox{pb}^{-1}$ 10.8~\mbox{pb}^{-1}$ respectively. cross as a function photon-proton energy range 25<W γp <110 GeV. Differential dσ/dt, where t is squared...

10.1140/epjc/s10052-013-2466-y article EN cc-by The European Physical Journal C 2013-06-01

A measurement is presented of the inclusive neutral current e\pm p scattering cross section using data collected by H1 experiment at HERA during years 2003 to 2007 with proton beam energies Ep 920, 575, and 460 GeV. The kinematic range covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q2 120 GeV2, small values Bjorken x, 2.9 \cdot 10-5 x 0.01, extends high inelasticity up y = 0.85. structure function FL measured combining new results previously published 920 GeV 820...

10.1140/epjc/s10052-011-1579-4 article EN cc-by-nc The European Physical Journal C 2011-03-01

A BSTRACT Inclusive e ± p single and double differential cross sections for neutral charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken a centre-of-mass energy of $ \sqrt {s} = {319} GeV total integrated luminosity 333.7 pb −1 shared between two lepton beam charges longitudinal polarisation modes. in range negative four-momentum transfer squared, Q 2 , 60 50 000 Bjorken x 0 . 0008 65. measurements combined earlier published...

10.1007/jhep09(2012)061 article EN cc-by Journal of High Energy Physics 2012-09-01

The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high transfer is presented. These data, taken with the H1 detector HERA, are corrected for effects using an unbinned machine learning algorithm (multifold), which considers eight observables simultaneously this application. unfolded cross sections compared calculations performed within context collinear or transverse-momentum-dependent factorization quantum chromodynamics as well...

10.1103/physrevlett.128.132002 article EN cc-by Physical Review Letters 2022-03-31

The femtosecond magnetization dynamics of a thin cobalt film excited with ultrashort laser pulses has been studied using two complementary pump-probe techniques, namely, spin-, energy-, and time-resolved photoemission the magneto-optical Kerr effect. Combining methods, it is possible to identify microscopic electron spin-flip mechanisms responsible for ultrafast macroscopic film. In particular, we show that electron-magnon excitation does not affect overall even though an efficient channel...

10.1103/physrevlett.97.177201 article EN Physical Review Letters 2006-10-23

Diffractive electroproduction of ρ and ϕ mesons is measured at HERA with the H1 detector in elastic proton dissociative channels. The data correspond to an integrated luminosity 51 pb−1. About 10500 2000 φ events are analysed kinematic range squared photon virtuality 2.5 ≤ Q 2 60 GeV2, photon-proton centre mass energy 35 W 180 GeV four-momentum transfer |t| 3 GeV2. total, longitudinal transverse cross sections as a function 2, |t|. measurements show transition dominantly "hard" behaviour,...

10.1007/jhep05(2010)032 article EN cc-by-nc Journal of High Energy Physics 2010-05-01

Inclusive charm and beauty cross sections are measured in e-p e+p neutral current collisions at HERA the kinematic region of photon virtuality 5<Q^2<2000 GeV^2 Bjorken scaling variable 0.0002<x<0.05. The data were collected with H1 detector years 2006 2007 corresponding to an integrated luminosity 189 pb^-1. numbers events determined using variables reconstructed by vertex including impact parameter tracks primary position secondary vertex. measurements combined previous compared QCD predictions.

10.1140/epjc/s10052-009-1190-0 article EN cc-by-nc The European Physical Journal C 2009-11-06

A first measurement is reported of the longitudinal proton structure function F_L(x,Q^2) at ep collider HERA. It based on inclusive deep inelastic e^+p scattering cross section measurements with a positron beam energy 27.5 GeV and energies 920, 575 460 GeV. Employing dependence section, F_L measured in range squared four-momentum transfers 12 < Q^2 90 GeV^2 low Bjorken x 0.00024 0.0036. The values agree higher order QCD calculations parton densities obtained using data previously

10.1016/j.physletb.2008.05.070 article EN cc-by Physics Letters B 2008-06-18

Inclusive $$ep$$ double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken a lepton beam energy of $$27.6$$ GeV and two proton energies $$E_p=460$$ 575 corresponding to centre-of-mass 225 252 GeV, respectively. measurements cover region $$6.5\times 10^{-4} \le x 0.65$$ $$35\le Q^2 800$$ $$^2$$ up $$y=0.85$$ . used together previously published $$E_p=920$$ lower $$Q^2$$ , $$575$$ $$920$$ extract longitudinal...

10.1140/epjc/s10052-014-2814-6 article EN cc-by The European Physical Journal C 2014-04-01
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