Achim Geiser

ORCID: 0000-0003-0355-102X
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About
Contact & Profiles
Research Areas
  • Particle physics theoretical and experimental studies
  • High-Energy Particle Collisions Research
  • Quantum Chromodynamics and Particle Interactions
  • Particle Detector Development and Performance
  • Computational Physics and Python Applications
  • Dark Matter and Cosmic Phenomena
  • Neutrino Physics Research
  • Cosmology and Gravitation Theories
  • Astrophysics and Cosmic Phenomena
  • Superconducting Materials and Applications
  • Particle Accelerators and Free-Electron Lasers
  • Medical Imaging Techniques and Applications
  • Distributed and Parallel Computing Systems
  • Black Holes and Theoretical Physics
  • Radiation Detection and Scintillator Technologies
  • Atomic and Subatomic Physics Research
  • Radiation Therapy and Dosimetry
  • Gamma-ray bursts and supernovae
  • Particle accelerators and beam dynamics
  • Scientific Computing and Data Management
  • Big Data Technologies and Applications
  • Noncommutative and Quantum Gravity Theories
  • International Science and Diplomacy
  • Parallel Computing and Optimization Techniques
  • Nuclear physics research studies

Deutsches Elektronen-Synchrotron DESY
2016-2025

University of Antwerp
2023-2024

A. Alikhanyan National Laboratory
2024

European Organization for Nuclear Research
1996-2024

Institute of High Energy Physics
2024

Karlsruhe Institute of Technology
2023

Vrije Universiteit Brussel
2023

Roche (Switzerland)
2018

Hamburg Institut (Germany)
2004-2017

Oklahoma State University
2016

The impact of recent measurements heavy-flavour production in deep inelastic ep scattering and pp collisions on parton distribution functions is studied a QCD analysis the fixed-flavour number scheme at next-to-leading order. Differential cross sections charm- beauty-hadron measured by LHCb are used together with inclusive HERA. data experiment impose additional constraints gluon sea-quark distributions low partonic fractions x proton momentum, down to $$x \sim 5 \times 10^{-6}$$ . This...

10.1140/epjc/s10052-015-3618-z article EN cc-by The European Physical Journal C 2015-08-01

Effects on atmospheric prompt neutrino fluxes of present uncertainties affecting the nucleon composition are studied by using PROSA fit to parton distribution functions (PDFs). The extends precision PDFs low x, which is kinematic region relevance for high-energy production, taking into account LHCb data charm and bottom hadroproduction. In range energies explored Very Large Volume Neutrino Telescopes, it found that PDF far smaller with respect those due renormalization factorization scale...

10.1007/jhep05(2017)004 article EN cc-by Journal of High Energy Physics 2017-05-01

The impact of measurements heavy-flavour production in deep inelastic $ep$ scattering and $pp$ collisions on parton distribution functions is studied a QCD analysis at next-to-leading order. Recent combined results inclusive cross sections HERA are investigated together with the LHC. Differential charm- beauty-hadron measured by LHCb collaboration centre-of-mass energies 5, 7 13 TeV as well recent ALICE experiment 5 explored. These data impose additional constraints gluon sea-quark...

10.1007/jhep04(2020)118 article EN cc-by Journal of High Energy Physics 2020-04-01

We report on the status of efforts to improve reinterpretation searches and measurements at LHC in terms models for new physics, context Reinterpretation Forum. detail current experimental offerings direct particles, measurements, technical implementations Open Data, provide a set recommendations further improving presentation results order better enable future. also brief description existing software frameworks recent global analyses physics that make use data.

10.21468/scipostphys.9.2.022 article EN cc-by SciPost Physics 2020-08-21

Two-particle azimuthal correlations have been measured in neutral current deep inelastic ep scattering with virtuality Q2> 5 GeV2 at a centre-of-mass energy $$ \sqrt{s} = 318 GeV recorded the ZEUS detector HERA. The of charged particles range laboratory pseudorapidity −1.5 < η 2.0 and transverse momentum 0.1 pT< 5.0 event multiplicities Nch up to six times larger than average 〈Nch〉 ≈ 5. two-particle terms angular observables cn{2} 〈〈cosnΔφ〉〉, where n is between 1 4 ∆φ relative angle two...

10.1007/jhep04(2020)070 article EN cc-by Journal of High Energy Physics 2020-04-01

Data from high-energy physics (HEP) experiments are collected with significant financial and human effort mostly unique. An inter-experimental study group on HEP data preservation long-term analysis was convened as a panel of the International Committee for Future Accelerators (ICFA). The formed by large collider-based investigated technical organisational aspects preservation. intermediate report released in November 2009 addressing general issues HEP. This paper includes extends report. It...

10.48550/arxiv.1205.4667 preprint EN other-oa arXiv (Cornell University) 2012-01-01
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