181 research outputs found
Soft gluon resummation for the associated production of a top quark pair with a W boson at the LHC
We present our results on soft gluon resummation in the invariant mass
threshold applied to the associated production of a top quark pair with a W
boson at the LHC in the Mellin space formalism.Comment: 6 pages, 4 figures, 1 table, proceedings prepared for the European
Physical Society Conference on High Energy Physics (EPS-HEP 2017), 5-12 July
2017, Venice, Ital
Associated top-pair production with a heavy boson production through NLO+NNLL accuracy at the LHC
In this talk we present results of our recent calculations of cross sections
and distributions for the associate production of top-antitop quark pairs with
a heavy boson (Higgs, W, Z) at the LHC, obtained using threshold resummation in
direct QCD, i.e. in the Mellin-space approach.Comment: 4 pages, 6 figures, contribution to the 2019 QCD session of the 54th
Rencontres de Morion
Improvement of the predictive value of CD4+ lymphocyte count by b2-microglobulin, immunoglobulin A and erythrocyte sedimentation rate
Top Precision for Associated Top-Pair Production Processes at the LHC
The studies of the associated production processes of a top-quark pair with a
colour-singlet boson, e.g. Higgs, W or Z, are among the highest priorities of
the LHC programme. Correspondingly, improvements in precision of theoretical
predictions for these processes are of central importance. In this talk, we
review our latest results on resummation of soft gluon corrections. The
resummation is carried out using the direct QCD Mellin space technique in
three-particle invariant mass kinematics. We discuss the impact of the soft
gluon corrections on predictions for total cross sections and differential
distributions.Comment: 12 pages, 9 figures, proceedings of the XXVI Cracow Epiphany
Conference on LHC Physics: Standard Model and Beyond, to be published in Acta
Physica Polonica
Associated top quark pair production with a heavy boson: differential cross sections at NLO+NNLL accuracy
We present theoretical predictions for selected differential cross sections
for the process at the LHC, where can be a Higgs
(), a or a boson. The predictions are calculated in the direct QCD
framework up to the next-to-next-leading logarithmic (NNLL) accuracy and
matched to the complete NLO results including QCD and electroweak effects.
Additionally, results for the total cross sections are provided. The
calculations deliver a significant improvement of the theoretical predictions,
especially for the and the production. In these
cases, predictions for both the total and differential cross sections are
remarkably stable with respect to the central scale choice and carry a
substantially reduced scale uncertainty in comparison with the complete NLO
predictions.Comment: 28 pages, 23 figures; Published versio
What determines HIV prevention costs at scale?:Evidence from the Avahan Programme in India
Expanding essential health services through nonâgovernment organisations (NGOs) is a central strategy for achieving universal health coverage in many lowâincome and middleâincome countries. Human immunodeficiency virus (HIV) prevention services for key populations are commonly delivered through NGOs and have been demonstrated to be costâeffective and of substantial global public health importance. However, funding for HIV prevention remains scarce, and there are growing calls internationally to improve the efficiency of HIV prevention programmes as a key strategy to reach global HIV targets. To date, there is limited evidence on the determinants of costs of HIV prevention delivered through NGOs; and thus, policymakers have little guidance in how best to design programmes that are both effective and efficient. We collected economic costs from the Indian Avahan initiative, the largest HIV prevention project conducted globally, during the first 4 years of its implementation. We use a fixedâeffect panel estimator and a randomâintercept model to investigate the determinants of average cost. We find that programme design choices such as NGO scale, the extent of community involvement, the way in which support is offered to NGOs and how clinical services are organised substantially impact average cost in a grantâbased payment setting. © 2016 The Authors. Health Economics published by John Wiley & Sons Ltd
How can we get close to zero? The potential contribution of biomedical prevention and the investment framework towards an effective response to HIV.
BACKGROUND: In 2011 an Investment Framework was proposed that described how the scale-up of key HIV interventions could dramatically reduce new HIV infections and deaths in low and middle income countries by 2015. This framework included ambitious coverage goals for prevention and treatment services resulting in a reduction of new HIV infections by more than half. However, it also estimated a leveling in the number of new infections at about 1 million annually after 2015. METHODS: We modeled how the response to AIDS can be further expanded by scaling up antiretroviral treatment (ART) within the framework provided by the 2013 WHO treatment guidelines. We further explored the potential contributions of new prevention technologies: 'Test and Treat', pre-exposure prophylaxis and an HIV vaccine. FINDINGS: Immediate aggressive scale up of existing approaches including the 2013 WHO guidelines could reduce new infections by 80%. A 'Test and Treat' approach could further reduce new infections. This could be further enhanced by a future highly effective pre-exposure prophylaxis and an HIV vaccine, so that a combination of all four approaches could reduce new infections to as low as 80,000 per year by 2050 and annual AIDS deaths to 260,000. INTERPRETATION: In a set of ambitious scenarios, we find that immediate implementation of the 2013 WHO antiretroviral therapy guidelines could reduce new HIV infections by 80%. Further reductions may be achieved by moving to a 'Test and Treat' approach, and eventually by adding a highly effective pre-exposure prophylaxis and an HIV vaccine, if they become available
Financing essential HIV services: a new economic agenda.
Anna Vassall and colleagues discuss the need for, and challenges facing, innovative and sustainable financing of the HIV response. Please see later in the article for the Editors' Summary
Besondere zeitliche VerlĂ€ufe des AIDS-Vollbildes: Unterschiede zwischen Patienten mit kurzer und langer Ăberlebenszeit
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