J. Strandberg
A5106944425- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced Data Storage Technologies
- Atomic and Subatomic Physics Research
- advanced mathematical theories
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Nuclear physics research studies
- Social and Educational Sciences
- Big Data Technologies and Applications
- Scientific Computing and Data Management
- Particle accelerators and beam dynamics
KTH Royal Institute of Technology
2016-2025
Stockholm University
2015-2024
University of Geneva
2023-2024
University of Manchester
2023-2024
Northern Illinois University
2016-2024
Institute for High Energy Physics
2023-2024
Institute of Science and Technology
2023-2024
Atlas Scientific (United States)
2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying dielectron or dimuon final states. Results are presented from an analysis of proton-proton (pp) collisions a center-of-mass energy 8 TeV corresponding integrated luminosity 20.3 fb-1 in channel and 20.5 channel. A narrow resonance with Standard Model Z couplings fermions excluded 95% confidence level masses less than 2.79 channel, 2.53 2.90 two channels combined. Limits on other model...
Measurements of charged-particle fragmentation functions jets produced in ultra-relativistic nuclear collisions can provide insight into the modification parton showers hot, dense medium created collisions. ATLAS has measured $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb at LHC using a data set recorded 2011 with an integrated luminosity 0.14 nb$^{-1}$. Jets were reconstructed anti-$k_{t}$ algorithm distance parameter values $R$ 0.2, 0.3, and 0.4. Distributions transverse momentum longitudinal fraction...
This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag remove background contaminated events data. Trigger-rate based monitoring beam-related is presented. The correlations with machine conditions, such as residual pressure beam-pipe, are discussed. Results from dedicated beam-background simulations shown, their qualitative agreement data evaluated. Data taken during passage unpaired, i.e. non-colliding, proton bunches used...
The ATLAS Collaboration has measured the inclusive production of $Z$ bosons via their decays into electron and muon pairs in $p+$Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV Large Hadron Collider. measurements are made using data corresponding to integrated luminosities 29.4 nb$^{-1}$ 28.1 for $Z \rightarrow ee$ \mu\mu$, respectively. results from two channels consistent combined obtain a cross section times \ell\ell$ branching ratio, over rapidity region $|y^{*}_{Z}|<3.5$, 139.8 $\pm$ 4.8...
Simultaneous measurements of the t¯t, W+W−, and Z/γ∗→ττ production cross-sections using an integrated luminosity 4.6 fb−1 pp collisions at √s=7 TeV collected by ATLAS detector LHC are presented. Events selected with two high transverse momentum leptons consisting oppositely charged electron muon pair. The three processes separated distributions missing events zero greater than jet multiplicities. Measurements fiducial cross-section presented along results that quantify for first time...
With an increased dataset obtained during the Run-2 of LHC at CERN, even larger forthcoming Run-3 data and expected increase by more than one order magnitude for HL-LHC, ATLAS experiment is reaching limits current production model in terms disk storage resources. The anticipated availability improved fast simulation will enable to produce significantly Monte Carlo samples with available CPU, which then be limited insufficient Analysis Model Study Group was setup end Run-2. Its tasks have been...
A direct and efficient method for evaluation of the error probability optical heterodyne receivers in presence phase noise is presented. closed form expression statistics decision variable, including photodetector shot thermal from electronic circuitry, derived. The analysis assumes simple integrating filters receiver based on a power series expansion filtered noise. calculated using saddle point approximation which numerically gives accurate results. optimal prefilter bandwidth best...
In this contribution, the data preparation workflows for Run 2 are presented. The challenges posed by excellent performance and high live time fraction of LHC discussed, solutions implemented ATLAS described. prompt calibration loop procedures described examples given. Several levels quality assessment used to quickly spot problems in control room prevent loss, provide final selection physics analysis. Finally efficiency analysis is shown.
The ATLAS analysis model has been overhauled for the upcoming run of data collection in 2015 at 13 TeV. One key component this upgrade was Event Data Model (EDM), which now allows greater flexibility choice software framework and provides powerful new features that can be exploited by tools. A second is introduction a dual-use tool technology, abstract interfaces tools to either Athena or ROOT-based framework. interfaces, including interface handling systematic uncertainties, have...
The International Particle Physics Group (IPPOG) is a global network active in informal education and outreach particle physics related research, including cosmic-ray astro-particle physics. Since many years, IPPOG has been actively supporting the Cosmic Day organized by DESY Muon Week Quarknet. In 2015 started work on establishing universal portal through which successful study programmes can reach out to teachers students around world. This common web platform being developed frame of its...
A bstract This paper discusses electroweak collider signatures of the NMSSM with multiple-sector gauge mediation. We focus on production neutralinos and charginos which cascade decay into standard model particles lighter supersymmetric particles, special emphasis final states multiple photons. search strategy for at least three photons is presented compared current exclusion limits based two-photon searches. show that in many regions parameter space our gives stronger constraints than...
This paper describes the concept, technical realisation and validation of a largely data-driven method to model events with Z→ττ decays. In Z→μμ selected from proton-proton collision data recorded at √s=8 TeV ATLAS experiment LHC in 2012, Z decay muons are replaced by τ leptons simulated Zarrowττ decays level reconstructed tracks calorimeter cells. The lepton kinematics derived original muons. Thus, only well-understood boson as well detector response products obtained simulation. All other...
We present new results for optically preamplified direct detection systems where the receiver thermal noise is significant. The obtained with this model in good agreement measured from a system experiment at 10 Gbit/s. It found that an optical gain of 30 dB sufficient to keep penalty due below 0.1 simple consisting photodiode loaded broadband amplifier 50-/spl Omega/ input impedance.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>