Browsing Department of Physics and Technology by Title
Now showing items 615-634 of 2098
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Heavy Higgs boson decays in the alignment limit of the 2HDM
(Peer reviewed; Journal article, 2018-12)The Standard Model (SM)-like couplings of the observed Higgs boson impose strong constraints on the structure of any extended Higgs sector. We consider the theoretical properties and the phenomenological implications of a ... -
Heavy Metal and Rock in Space: Cluster RAPID Observations of Fe and Si
(Journal article; Peer reviewed, 2021)Metallic and silicate ions carry essential information about the evolution of the Earth and near-Earth small bodies. Despite this, there has so far been very little focus on ions with atomic masses higher than oxygen in ... -
Heavy-flavour hadron decay leptons in Pb–Pb and Xe–Xe collisions at the LHC with ALICE
(Peer reviewed; Journal article, 2019)Heavy quarks, i.e. charm and beauty, are sensitive probes of the medium produced in high-energy heavy-ion collisions. They are produced in the early stage of the collision, mainly in hard partonic scattering processes, and ... -
Helium radiography with a digital tracking calorimeter—a Monte Carlo study for secondary track rejection
(Journal article; Peer reviewed, 2021)Radiation therapy using protons and heavier ions is a fast-growing therapeutic option for cancer patients. A clinical system for particle imaging in particle therapy would enable online patient position verification, ... -
HEPPA III Intercomparison Experiment on Electron Precipitation Impacts: 1. Estimated Ionization Rates During a Geomagnetic Active Period in April 2010
(Journal article; Peer reviewed, 2022)Precipitating auroral and radiation belt electrons are considered an important part of the natural forcing of the climate system. Recent studies suggest that this forcing is underestimated in current chemistryclimate models. ... -
Heppa III Intercomparison Experiment on Electron Precipitation Impacts: 2. Model-Measurement Intercomparison of Nitric Oxide (NO) During a Geomagnetic Storm in April 2010
(Journal article; Peer reviewed, 2022)Precipitating auroral and radiation belt electrons are considered to play an important part in the natural forcing of the middle atmosphere with a possible impact on the climate system. Recent studies suggest that this ... -
Heterogeneous distributed calibration framework for the high level trigger in ALICE
(Doctoral thesis, 2009-02-13)This thesis focusses on the development of a distributed and re-configurable online calibration environment for the ALICE (A Large Ion Collider Experiment) HLT (High Level Trigger). ALICE1 is one of the four major experiments ... -
Heterogeneous Hydrate Nucleation on Calcite {1014} and Kaolinite {001} Surfaces: A Molecular Dynamics Simulation Study
(Master thesis, 2016-06-01)Natural gas hydrates are of significant interest due to the great amount of methane that can potentially be utilised as an energy source. These methane resources are trapped in ice-like form, which is a concern since ... -
The Higgs Boson in Less Constrained Supersymmetric Models
(Master thesis, 2012-06-01)In this thesis, we explore the phenomenological minimal supersymmetric standard model (pMSSM) in the context of the Higgs boson. If the emerging results from the LHC are real, will the pMSSM be able to accommodate this? ... -
Higgs boson production cross-section measurements and their EFT interpretation in the 4 ℓ decay channel at √s= 13 TeV with the ATLAS detector
(Journal article; Peer reviewed, 2020-10)Higgs boson properties are studied in the four-lepton decay channel (where lepton = e, μ) using 139 fb−1 of proton–proton collision data recorded at s√=13 TeV by the ATLAS experiment at the Large Hadron Collider. The ... -
The Higgs-like boson spin from the center–edge asymmetry in the diphoton channel at the LHC
(Peer reviewed; Journal article, 2015-05-07)We discuss the discrimination of the 125 GeV spin-parity 0+ Higgs-like boson observed at the LHC, decaying into two photons, H→γγ, against the hypothesis of a minimally coupled JP=2+ narrow diphoton resonance with the same ... -
High Back Pressure on Pressure Safety Valves (PSVs) in a Flare System. Developing the Simulation model, Identifying and analyzing the back-pressure build-up
(Master thesis, 2013-10-01)Process safety is a disciplined framework for managing the integrity of operating systems and processes handling hazardous substances. It is achieved by applying good design principles, engineering, and operating and ... -
High Harmonic Generation in Strongly Correlated Systems
(Master thesis, 2018-06-23)In recent years, the study of phenomena pertaining to non-linear properties of materials has seen a major upswing - especially in the context of High Harmonic Generation (HHG). In this thesis, an account of the current ... -
High voltage electrical discharges in the laboratory
(Master thesis, 2014-12-18)A new phenomenon called terrestrial gamma-ray flashes (TGFs) was discovered early in the 1990s by the NASA satellite Compton Gamma-Ray Observatory. The short-duration bursts of highly energetic gamma-rays are caused by ... -
A high-granularity digital tracking calorimeter optimized for proton CT
(Journal article; Peer reviewed, 2020)A typical proton CT (pCT) detector comprises a tracking system, used to measure the proton position before and after the imaged object, and an energy/range detector to measure the residual proton range after crossing the ... -
High-latitude cold ion outflow inferred from the Cluster wake observations in the magnetotail lobes and the polar cap region
(Journal article; Peer reviewed, 2021)Cold ions with low (a few eV) thermal energies and also often low bulk drift energies, dominate the ion population in the Earth’s magnetosphere. These ions mainly originate from the ionosphere. Here we concentrate on cold ... -
High-latitude magnetic fields and their time derivatives: interhemispheric similarities
(Peer reviewed; Journal article, 2013-02-19)There are two simple and objective measures of geomagnetic activity: the daily range of field components, and the daily maximum of the time derivative of the field. We study these using data from the geomagnetic latitude ... -
High-order harmonic generation from graphene: Strong attosecond pulses with arbitrary polarization
(Peer reviewed; Journal article, 2013-05-03)We explore high-order harmonic generation (HHG) from a graphene sheet exposed to intense femtosecond laser pulses based on the Lewenstein model. It is demonstrated that the HHG cutoff frequency increases with graphene size ... -
High-precision limits on W–W′and Z–Z′ mixing from diboson production using the full LHC Run 2 ATLAS data set
(Journal article; Peer reviewed, 2020)The full ATLAS Run 2 data set with time-integrated luminosity of 139fb−1 in the diboson channels in hadronic final states is used to probe a simple model with an extended gauge sector (EGM), proposed by Altarelli et al., ... -
Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at \(\sqrt{s_{\rm NN}}\) = 2.76 TeV
(Peer reviewed; Journal article, 2016-09)The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for \(\pi^{\pm}\). \(\mathrm{K}^{\pm}\) and p+\).overline{\mathrm{p}}\) in Pb-Pb collisions at \(\sqrt{s_\mathrm{{NN}}} = 2.76\) TeV were ...