## Search

Now showing items 1-10 of 16

#### Search for Weakly-interacting, Long-lived particles that Decay to Displaced Hadronic Jets in Proton-Proton Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector.

A search is presented for the decay of the Standard Model Higgs boson or another scalar boson to a pair of weakly-interacting, long-lived particles in 20.3 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 8$ TeV recorded in 2012 by the ATLAS detector. The strategy requires that one of the long-lived particles decay inside ...

#### On the Determination of Elastic and Inelastic Nuclear Observables from Lattice QCD

(2013-11-14)

One of the overarching goals of nuclear physics is to rigorously compute properties of hadronic systems directly from the fundamental theory of the strong interaction, Quantum Chromodynamics (QCD). In particular, the hope is to perform reliable calculations of nuclear processes which would impact our understanding of environments ...

#### Hidden Sector: Three Different Ways

(2013-11-14)

This thesis is a compilation of three projects that explore the consequences of different Hidden Sector models in various experimental fields. The first project proposes the Hidden Sector is populated by just one U(1) vector particle. It couples to the Standard Model through kinetic mixing and is responsible for a fraction ...

#### A SQUID-Based RF Cavity Search for Dark Matter Axions

(2013-07-25)

The axion is a hypothetical elementary particle resulting from a solution to the “Strong-CP” problem. This serious problem in the standard model of particle physics is manifested as a 10<super>10</super> discrepancy between the measured upper limit and the calculated value of the neutron's electric dipole moment. Furthermore, ...

#### Searches for Beyond Standard Model Higgs Bosons in pp collisions at sqrt(s) = 8 and 13 TeV with the ATLAS detector

The searches for a Beyond Standard Model (BSM) heavy CP-odd Higgs boson $A$ decaying to $Zh$ in the context of two-Higgs-doublet models (2HDM), and Minimal Supersymmetric Standard Model (MSSM) neutral Higgs bosons $H/A$ decaying to a tau pair are presented. The search for the heavy CP-odd Higgs boson, $A$, is conducted through ...

#### Holographic Tools for Probing the Dynamics of Strongly Coupled Field Theories

Since it was conjectured almost 20 years ago, AdS/CFT duality, or holography, has enabled steady progress in understanding certain gauge theories in the strongly coupled limit. In this thesis we examine various aspects of holography and holographic techniques, as well as particular applications to the dynamics of strongly ...

#### Searching for neutrinoless double-beta decay of germanium-76 in the presence of backgrounds

(2013-04-17)

The neutrino, an elementary particle, has been the subject of experimental investigation for over 50 years. Recent experiments have shown that neutrinos have mass and oscillate, but questions about fundamental properties of the neutrino remain. The observation of neutrinoless double-beta decay could determine whether lepton ...

#### Fixing the Standard Model: From Dark Matter to the Baryon Asymmetry of the Universe

Since its foundation in the 20th century, the Standard Model has been immensely powerful in explaining many particle physics phenomena. With the discovery of the Higgs boson at the LHC, the Standard Model seems to be complete. However, there are many observations that we cannot explain within the Standard Model. After giving ...

#### Developments for the $^6$He $\beta-\bar{\nu}$ angular correlation experiment

This thesis describes developments toward the measurement of the angular correlation between the beta and the antineutrino in the beta decay of $^6$He. This decay is a pure Gamow-Teller decay which is described in the Standard Model as a purely axial vector weak interaction. The angular correlation is characterized by the ...

#### A novel method for electron energy measurement: Cyclotron Radiation Emission Spectroscopy

A prototype spectrometer - the first of its kind - has been constructed at the University of Washington to demonstrate a new technique for β-decay studies called Cyclotron Radiation Emission Spectroscopy (CRES). The conversion spectrum of 83mKr has been measured to a precision of 25 eV. Conclusive observation of the K , L, M ...