Search results

Motivated by the analysis of the tunneling effect for the magnetic Laplacian, we introduce an abstract framework for the spectral reduction of a self-adjoint operator to a hermitian matrix. We illustrate this framework by three applications, firstly the electro-magnetic Laplacian with constant magnetic field and three equidistant potential wells, secondly a pure constant magnetic field and Neumann

A search is presented for the pair-production of heavy vector-like quarks in the lepton+jets final state using 140 fb−1 of proton–proton collisions at s=13 TeV collected with the ATLAS detector. The search is optimised for vector-like top-quarks (T) that decay into a W boson and a b-quark, with one W boson decaying leptonically and the other hadronically. Other vector-like quark flavours and decay

A measurement of the Standard Model Higgs boson produced in association with a W or Z boson and decaying into a pair of τ-leptons is presented. This search is based on proton-proton collision data collected at s=13 TeV by the ATLAS experiment at the LHC corresponding to an integrated luminosity of 140 fb−1. For the Higgs boson candidate, only final states with at least one τ-lepton decaying hadron

A search for flavour-changing neutral interactions involving the top quark, the Higgs boson and an up-type quark q (q = c, u) is presented. The proton-proton collision data set used, with an integrated luminosity of 139 fb−1, was collected at (Formula presented.) TeV by the ATLAS experiment at the Large Hadron Collider. Both the decay process t → qH in tt¯ production and the production process pp

A search is presented for non-resonant Higgs boson pair production, targeting the bbZZ, 4V (V = W or Z), VVττ, 4τ, γγVV and γγττ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of proton-proton collisions at s = 13 TeV recorded with the ATLAS detector

This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ0 mesons. The ρ0 mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos⁡(2ϕ) modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse mo

This thesis investigates how family ownership affects the short-term market reaction to acquisition announcements by serial acquirers. While family firms are traditionally viewed as conservative and long-term oriented, some engage in repeated acquisitions, a strategy typically associated with higher risk and managerial overconfidence. Using a sample of 678 acquisitions by Swedish publicly listed f

This thesis wants to investigate whether machine learning, trained on candlestick data, can be used to forecast intraday returns. Previous research has primarily focused on returns with longer horizons and is therefore leaving a research gap on shorter horizons. This thesis will use a combination of Convolutional Neural Networks (CNN) and Long Short-Term Memory (LSTM) as the deep learning model to

This study examines the effects on risk-minimisation by incorporating emerging market equities in a portfolio, from the perspective of a Swedish investor. Since investors usually care about returns these are also a part of the study. The hypothesis is that the international diversification benefits will outweigh the higher risks of emerging market equities. The analysis is conducted on 267 monthly

We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysis, but the joint modeling with the VLTI data breaks several degeneracies, arriving at a strongly favored solution. Thanks to precise measurements of the angular

In recent years, a wave of protests has swept the South Asian subcontinent. These protests have been spearheaded by Generation Z, a generation that has been described as disillusioned with, and disconnected from, politics. The protests have been met with disproportionate state violence, despite generally following non-violent disciplines. Bangladesh and Sri Lanka are two such countries. This thesi

ESS, a European Research Infrastructure Consortium (ERIC), is getting ready to be a leading multidisciplinary facility with the world's most potent neutron source. Dedicated to scientific breakthroughs, ESS focuses on materials, energy, health, and environmental research to address key societal challenges. ESS will host 22 specialized scientific instruments selected to cover a broad range of exper

Bakgrund Att få ett barn med medfött hjärtfel är en omvälvande och ofta chockartad upplevelse för föräldrar, där särskilt pappor kan känna sig osynliggjorda och sakna anpassat stöd, samtidigt som deras behov och reaktioner ofta skiljer sig från mammors. Syftet med denna studie var att undersöka pappors erfarenheter av socialt stöd när ett barn föds med hjärtfel i Sverige. Metod Studien genomfördes