S. H. Robertson
A5115598449- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- advanced mathematical theories
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Advanced Data Storage Technologies
- Black Holes and Theoretical Physics
- Structural Analysis of Composite Materials
- Advanced NMR Techniques and Applications
- Reservoir Engineering and Simulation Methods
- NMR spectroscopy and applications
- Algebraic Geometry and Number Theory
- Laser-induced spectroscopy and plasma
- Engineering and Materials Science Studies
McGill University
2006-2025
Institute of Particle Physics
2020-2025
University of Colorado Boulder
2012
BT Group (United Kingdom)
2005
SLAC National Accelerator Laboratory
2001
Stanford University
2001
Stanford Synchrotron Radiation Lightsource
2001
University of Reading
1984
Abstract. The ionosphere is always assumed to contain equal numbers of positive and negative charges in a given volume (quasineutrality). Hence fewer electrons than are an indication other electrons. Theories predict in-situ mass spectrometer measurements confirmed that these ions, but recent experimental results suggest scavengers free can also be active the mesosphere. Outside polar summer mesosphere this additional removal today believed due meteoric dust, which maximises Data...
We present the current status of MATHUSLA (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles) long-lived particle (LLP) detector at HL-LHC, covering design, fabrication and installation CERN Point 5. MATHUSLA40 is a 40 m-scale with an air-filled decay volume that instrumented scintillator tracking detectors, to be located near CMS. Its large size, close proximity CMS interaction point about 100 m rock shielding from LHC backgrounds allows it detect LLP production rates lifetimes...
We report on recent progress and next steps in the design of proposed MATHUSLA Long Lived Particle (LLP) detector for HL-LHC as part Snowmass 2021 process. Our understanding backgrounds has greatly improved, aided by detailed simulation studies, significant R&D been performed designing scintillator detectors their performance. The collaboration is track to complete a Technical Design Report, there are many opportunities interested new members contribute towards goal constructing time...
We report on recent progress in the design of proposed MATHUSLA Long Lived Particle (LLP) detector for HL-LHC, updating information original Letter Intent (LoI), see CDS:LHCC-I-031, arXiv:1811.00927. A suitable site has been identified at LHC Point 5 that is closer to CMS Interaction (IP) than assumed LoI. The decay volume increased from 20 m 25 height. Engineering studies have made order locate much below ground, bringing even IP. With these changes, a 100 x same physics reach large c$\tau$...
In 2004, de Mathan and Teuli\'e stated the $p$-adic Littlewood Conjecture ($p$-$LC$) in analogy with classical Conjecture. Given a field $\mathbb{K}$ an irreducible polynomial $p(t)$ coefficients $\mathbb{K}$, $p$-$LC$ admits natural analogue over function fields, abbreviated to $p(t)$-$LC$ (and $t$-$LC$ when $p(t)=t$). this paper, explicit counterexample is found fields of characteristic 5. Furthermore, it conjectured that Laurent series disproves all $p\equiv 1 \mod 4$. This fills gap left...
ATLAS is one of the four major LHC experiments, designed to cover a wide range physics topics. In order cope with rate 40MHz and 25 interactions per bunch crossing, trigger system divided in three different levels. The jet selection starts at first level dedicated processors that search for high ET hadronic energy depositions. At LVL2, signatures are verified execution dedicated, fast reconstruction algorithm, followed by calibration algorithm. Three possible granularities have been proposed...
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...
Abstract The Belle II experiment has recently completed its “Phase 2” commissioning operations run, during which first collisions at the <?CDATA $\Upsilon (4S)$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>ϒ</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mn>4</mml:mn> <mml:mi>S</mml:mi> stretchy="false">)</mml:mo> </mml:math> resonances were recorded. is successor of BABAR and B Factory experiments, designed to operate a peak luminosity 8 × 10 35...
To improve the understanding of accelerator-induced backgrounds at SLAC B-Factory, we simulate lost particle in BABAR detector originating from beam-gas interactions and radiative Bhabha scatters. We have extended GEANT4-based simulation to include beam-line components magnetic fields up 8.5 m away interaction point. describe model then compare preliminary predicted background levels with measurements dedicated single-and colliding-beam experiments.
The ATLAS-Canada computing model consists of a WLCG Tier-1 centre located at the TRIUMF Laboratory in Vancouver, Canada, and two distributed Tier-2 centres eastern western Canadian universities. is connected to CERN Tier-0 via 10G dedicated circuit provided by CANARIE. institutions hosting facilities are 1G lightpaths, routing between Tier-2s occurs through TRIUMF. This paper discusses architecture network, challenges building future plans.