295 research outputs found
Valentine. Accept a Hearty Wish
No full textLayers of paper in a filigree pattern, with different types of small flowers accenting an oval shape with a young girl\u27s face as the center of a flower. There are faces two additional girls on top of angel wings. Under the oval is a small book closed over a bouquet of flowers; the cover has text, Accept a Hearty Wishhttps://egrove.olemiss.edu/romance_revelry/1011/thumbnail.jp
Search for axion like particles with the BaBar detector and photon hadron separation using Zernike moments at Belle II
No full textEven though the Standard Model of particle physics is a very successful model, we know that it is incomplete. For example, it does not explain why the world we see around us is made of matter rather than anti-matter and it does not incorporate the force of gravity. One extension of the Standard Model is the introduction of Axion Like Particles, ALPs. ALPs appear in string theories and supersymmetry and they might explain some astrophysical anomalies. ALPs can be produced in electron-positron colliders and detected in the specialized detectors built around their interaction point, like the PEP-II collider and the BaBar detector at the Stanford Linear Accelerator Center. This work presents an un-blinded search for an ALP that couples exclusively to photons in 5% of the BaBar data. We search for an excess in the invariant mass distribution of ALP candidates over a smooth background. The results are consistent with the data being composed only of Standard Model background. 90% credible interval upper limits are set on the ALP production cross section and coupling constant. These limits exclude previously unexplored regions of the phase space in the mass range 0.29 GeV/c² to 5 GeV/c². In searches involving photons, it is important to be able to efficiently detect them while rejecting other types of particles. Many high energy particle detectors detect photons in electromagnetic calorimeters that are made up of many cells. A photon interacting with the calorimeter typically leaves a different energy distribution in the cells than some other particle types, hadrons, for example. Discriminating variables for photons, based on Zernike moments, are developed in order to improve the photon identification at Belle II. One of the new variables is found to be the best at identifying photons among all other such variables used at Belle II for photons with energies in the energy range most relevant to e+e− → BB events.Science, Faculty ofPhysics and Astronomy, Department ofGraduat
Signal proxy and radiative Bhabha background studies : contributions to the search for invisibly decaying dark photons at Belle II
No full textThe nature of dark matter is one of the greatest extant mysteries in physics. Many hypotheses have been proposed to explain dark matter, but none have ever been substantiated. Some of these hypotheses propose dark sectors, i.e., entire families of dark matter particles. One such hypothesis is that of the dark photon, a massive, gauge boson which would be the mediator of the dark electromagnetic force. The dark photon would couple feebly to the photon, and thereby be producible through e⁺e⁻ annihilation at a particle collider. Described here are contributions toward a search for the dark photon at Belle II, an electron-positron collider experiment in Japan. This search focuses on invisible decays of the dark photon, with a single initial-state radiation photon serving as the only evidence of the production and decay. Due to the delicate nature of this event signature, the dark photon search requires a carefully constructed set of event requirements and vetoes that remove as much background as possible without removing a large amount of the signal. To further this goal, two control samples were designed. One control sample is of a clean radiative dimuon sample, used as a signal proxy, while the other is of the radiative Bhabha background. These control samples are then used to design vetoes and selection criteria for the search for the dark photon at Belle II, termed the single-photon analysis.Science, Faculty ofPhysics and Astronomy, Department ofGraduat
Search for invisible decays of dark photon at Belle II
No full textThe Standard Model of particle physics displays a good description of the nature of fundamental particles. However, there are some inconsistencies between theory and experimental evidence. One of the observations made through astronomy and cosmology but is not explained by the Standard Model is dark matter. Many theories have been made to explain dark matter, which includes the dark photon particle. The dark photon is a hypothetical particle thought to exist as a mediator between the Standard Model photon and dark matter particles. The dark photons can be produced at an electron-positron collider like the Belle II experiment, located at the KEK particle physics facility. The work presented shows the first attempts of the search for dark photons with invisible decays, where studies on background were conducted for low dark photon masses. This involved understanding the different backgrounds for dark photon events, the geometry and efficiency of the main sub-detectors, and making the final background estimates. In addition, discrepancies between data and Monte Carlo events for the background control sample were found due to detector imperfections, which are also summarised here.Science, Faculty ofPhysics and Astronomy, Department ofGraduat
Soul and body, sound and hearty: getting to know Bishop MacEachern
No full textThe examination of a letter written by first Roman Catholic bishop of Prince Edward Island, the Scottish Highlander Angus Bernard MacEachern, written in 1832 to a former parishoner Angus Walker in which the bishop engages in clever code switching from English to Scottish Gaelic and back in order to deliver a message which could only be understood, if intercepted, by another bilingual Scottish Gaelic/English speaker. The paper reveals the historical setting of the 1832 letter and goes on to examine closely the passages of Scottish Gaelic: their meaning in terms of social commentary, their non-standard orthography which provide clues to mainland Scottish dialect variants evidenced by the same, and the descriptions of parishoners encrypted in the author's first language.Source type: Print(0
Reading recovery : an intervention to accelerate literacy levels and attitudes towards reading and writing
No full textThe aim of this study was to evaluate the efficiency of “Reading Recovery” as an early intervention for literacy, and to measure the correlation between attitudes and literacy levels. A quasi-experimental analysis using a between group design, measured the effects of the intervention across a twelve week period. Four participants received the intervention, and six participants did not. Reading Recovery and standardised assessments measured reading comprehension, fluency, phonemic awareness, and writing accuracy. The experimental group improved significantly across three time points, and scored significantly higher than the control group in most assessments at time three. Attitudes towards reading and writing significantly improved with rising literacy scores for experimental participants. Reading Recovery was successful in improving literacy scores and attitudes, and should be considered for broader research across Irish schools. Author keywords: Education, literacy, interventio
THE 'MARIA SCREENING INSTRUMENT’ FOR POST-OPEN PROSTATECTOMY BLEEDING RISK: A QUALITATIVE STUDY
No full textConstruction of the Maria Screening Instrument Risk of Bleeding Post Open Prostatectomy” is a guide used to assess the risk of bleeding after open prostatectomy. Patients require 85% blood transfusion when resection exceeds 80% of the prostate. The surgical complications that are feared during open prostatectomy surgery are bleeding and obstruction of urine flow. This study aims to identify, analyze and develop a screening instrument for the risk of bleeding after open sprostatectomy. The author conducted a qualitative exploration with 6 participants from different professions in a Focus Group Discussion (FGD) to get a picture of the need for instruments to become a necessity at Boven Digoel Regional Hospital, followed by expert consultation and revisions according to suggestions. The MARIA instrument is the choice for observing post-open prostatectomy patients, namely: Minimizing Blood Loss, Assuring Safe Treatment. Reducing Complications, Individualizing Care, Accelerating Recovery. Conclusion. Maria's screening instrument as a guide is needed to assess the risk of post-open prostatectomy bleeding. Assessment of post-prostatectomy patients should use assessment instruments that can be developed according to hospital needs
A second dialogue between the Pope and a phanatick, concerning affairs in England by the author of the first, who is a hearty lover of his prince and country.
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