Signatures of top flavour-changing dark matter D’Hondt, Jorgen; Mariotti, Alberto; Mawatari, Kentarou ...
The journal of high energy physics,
03/2016, Letnik:
2016, Številka:
3
Journal Article
Recenzirano
Odprti dostop
A
bstract
We develop the phenomenology of scenarios in which a dark matter candidate interacts with a top quark through flavour-changing couplings, employing a simplified dark matter model with an
s
...-channel vector-like mediator. We study in detail the top-charm flavour-changing interaction, by investigating the single top plus large missing energy signature at the LHC as well as constraints from the relic density and direct and indirect dark matter detection experiments. We present strategies to distinguish between the top-charm and top-up flavour-changing models by taking advantage of the lepton charge asymmetry as well as by using charm-tagging techniques on an extra jet. We also show the complementarity between the LHC and canonical dark matter experiments in exploring the viable parameter space of the models.
The degradation of signal in silicon sensors is studied under conditions expected at the CERN High-Luminosity LHC. 200 \(\mu\)m thick n-type silicon sensors are irradiated with protons of different ...energies to fluences of up to \(3 \cdot 10^{15}\) neq/cm\(^2\). Pulsed red laser light with a wavelength of 672 nm is used to generate electron-hole pairs in the sensors. The induced signals are used to determine the charge collection efficiencies separately for electrons and holes drifting through the sensor. The effective trapping rates are extracted by comparing the results to simulation. The electric field is simulated using Synopsys device simulation assuming two effective defects. The generation and drift of charge carriers are simulated in an independent simulation based on PixelAV. The effective trapping rates are determined from the measured charge collection efficiencies and the simulated and measured time-resolved current pulses are compared. The effective trapping rates determined for both electrons and holes are about 50% smaller than those obtained using standard extrapolations of studies at low fluences and suggests an improved tracker performance over initial expectations.
Update
This article was updated on September 4, 2020, because of a previous error. On page 1211, in the author affiliation section, “W.L. Walter, MBBS, PhD
3
” now reads “W.L. Walter, MBBS, PhD
3,4
...,” the affiliation for Dr. Van Onsem that had read “
3
Specialist Orthopedic Group, The Mater Clinic, North Sydney, New South Wales, Australia” now reads “
3
Royal North Shore Hospital, St. Leonards, New South Wales, Australia,” and the affiliation for Dr. Walter that had read “
3
Specialist Orthopedic Group, The Mater Clinic, North Sydney, New South Wales, Australia” now reads “
3
Royal North Shore Hospital, St. Leonards, New South Wales, Australia” and “
4
University of Sydney, Sydney, New South Wales, Australia.”
An erratum has been published: J Bone Joint Surg Am. 2020 Oct 7;102(19):e113
» As we resume elective surgical procedures, it is important to understand what practices and protocols should be altered or implemented in order to minimize the risk of pathogen transfer during the severe acute respiratory syndrome (SARS)-CoV-2 pandemic.
» Each hospital and health system should consider their unique situation in terms of SARS-CoV-2 prevalence, staffing capabilities, personal protection equipment supply, and so on when determining how and when to implement these recommendations.
» All patients should be screened for SARS-CoV-2 by means of a thorough history and physical examination, as well as reverse transcription-polymerase chain reaction (RT-PCR) testing whenever possible, prior to undergoing elective surgery.
» Patients who are currently infected with coronavirus disease 2019 (COVID-19) should not undergo elective surgery.
» These guidelines are based on the available scientific evidence, albeit scant. The recommendations have been reviewed and voted on by the expert delegates who produced this document.
Lessons from the MONICA project Kornitzer, M; de Smet, P; Desqueuve, R ...
Annales de cardiologie et d'angéiologie
44, Številka:
10
Journal Article
Recenzirano
The authors review the various aspects of the MONICA project (Monitoring of Trends and Determinants in Cardiovascular Diseases) coordinated by the World Health Organization. This study comprises, in ...a defined geographical or administrative entity, an infarction Registry, two or three population surveys and two or three surveys concerning the treatment of the acute phase of myocardial infarction. It is a ten-year study conducted by 39 collaborative centres in 4 continents. The main hypotheses of this study have not yet been verified, as some centres have not completed the 10 years of infarction recording and/or the last population survey. However, the results collected to date and reported in about ten publications grouping all centres, and more than 500 articles published by various centres, demonstrate the wealth of precious information for clinicians provided by this public health project. For example, the infarction Registry demonstrates marked regional differences in myocardial infarction rates in the population and therefore marked differences in acute coronary bed requirements. The Registry also confirms the higher mortality rates in women and at the end of infarction compared to men. Population surveys can be used to follow the course of the main coronary risk factors and to compare the levels of risk factors in different centres. Regional differences clearly show that a more or less aggressive approach to primary prevention is required. Finally, the presence of an infarction Registry and population surveys allow the elaboration of case-control study protocols, several examples of which are mentioned by the authors. All of these techniques will be able to more clearly define the aetiology of coronary heart disease and, consequently, the reduction of this disease in the population by adequate primary and secondary prevention.
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