113 research outputs found
The Matrix Element Method and QCD Radiation
The matrix element method (MEM) has been extensively used for the analysis of
top-quark and W-boson physics at the Tevatron, but in general without dedicated
treatment of initial state QCD radiation. At the LHC, the increased center of
mass energy leads to a significant increase in the amount of QCD radiation,
which makes it mandatory to carefully account for its effects. We here present
several methods for inclusion of QCD radiation effects in the MEM, and apply
them to mass determination in the presence of multiple invisible particles in
the final state. We demonstrate significantly improved results compared to the
standard treatment.Comment: 15 pp; v2: references and some clarifications added; v3: discussion
of NLO effects, version published in PR
Asymmetric collisions in MadGraph5_aMC@NLO
We will gain unprecedented, high-accuracy insights into the internal structure of the atomic nucleus thanks to lepton-hadron collision studies in the coming years at the Electron-Ion-Collider (EIC) in the United States. A good control of radiative corrections is necessary for the EIC to be fully exploited and to extract valuable information from various measurements. We present our extension of photoproduction at fixed order in MadGraph5_aMC@NLO, a widely used framework for (next-to-)leading order calculations at the Large Hadron Collider (LHC). It applies to electron-hadron collisions, in which the quasi-real photon comes from an electron as well as to proton-nucleus and nucleus-nucleus collisions
Исследование процесса синтеза гидрокарбонатных магнезиальных структур в водных условиях
Объект исследования – магнезиальное вяжущее на основе порошка каустического магнезита и водного раствора бикарбоната магния в качестве затворителя.
Предмет исследования – процесс синтеза гидрокарбонатных магнезиальных структур при твердении гидравлического магнезиального вяжущего в водных условиях.
Цель работы – исследование процесса синтеза гидрокарбонатных магнезиальных структур при твердении гидравлического магнезиального вяжущего в водных условиях.
В результате исследования: установлено влияние водной среды и типа системы (открытой и закрытой) на процессы гидратации и твердения магнезиального вяжущего.The object of research is a magnesia binder based on caustic magnesite powder and an aqueous solution of magnesium bicarbonate as a grouting fluid.
The subject of research is the process of synthesis of hydrocarbonate magnesia structures during hardening of a hydraulic magnesia binder in water conditions.
The purpose of this work is to study the synthesis of hydrocarbonate magnesia structures during hardening of a hydraulic magnesia binder in water conditions.
As a result of the research: the influence of the aquatic environment and the type of system (open and closed) on the processes of hydration and hardening of magnesia binder was established
Wet-Chemical Synthesis of 3D Stacked Thin Film Metal-Oxides for All-Solid-State Li-Ion Batteries.
By ultrasonic spray deposition of precursors, conformal deposition on 3D surfaces of tungsten oxide (WO₃) negative electrode and amorphous lithium lanthanum titanium oxide (LLT) solid-electrolyte has been achieved as well as an all-solid-state half-cell. Electrochemical activity was achieved of the WO₃ layers, annealed at temperatures of 500 °C. Galvanostatic measurements show a volumetric capacity (415 mAh·cm-3) of the deposited electrode material. In addition, electrochemical activity was shown for half-cells, created by coating WO₃ with LLT as the solid-state electrolyte. The electron blocking properties of the LLT solid-electrolyte was shown by ferrocene reduction. 3D depositions were done on various micro-sized Si template structures, showing fully covering coatings of both WO₃ and LLT. Finally, the thermal budget required for WO₃ layer deposition was minimized, which enabled attaining active WO₃ on 3D TiN/Si micro-cylinders. A 2.6-fold capacity increase for the 3D-structured WO₃ was shown, with the same current density per coated area
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report
This Report summarizes the proceedings of the 2013 Les Houches workshop on
Physics at TeV Colliders. Session 1 dealt primarily with (1) the techniques for
calculating standard model multi-leg NLO and NNLO QCD and NLO EW cross sections
and (2) the comparison of those cross sections with LHC data from Run 1, and
projections for future measurements in Run 2.Comment: Proceedings of the Standard Model Working Group of the 2013 Les
Houches Workshop, Physics at TeV Colliders, Les houches 3-21 June 2013. 200
page
Dark Matter benchmark models for early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
This document is the final report of the ATLAS-CMS Dark Matter Forum, a forum organized by the ATLAS and CMS collaborations with the participation of experts on theories of Dark Matter, to select a minimal basis set of dark matter simplified models that should support the design of the early LHC Run-2 searches. A prioritized, compact set of benchmark models is proposed, accompanied by studies of the parameter space of these models and a repository of generator implementations. This report also addresses how to apply the Effective Field Theory formalism for collider searches and present the results of such interpretations
MadGraph 5 : Going Beyond
MadGraph 5 is the new version of the MadGraph matrix element generator,
written in the Python programming language. It implements a number of new,
efficient algorithms that provide improved performance and functionality in all
aspects of the program. It features a new user interface, several new output
formats including C++ process libraries for Pythia 8, and full compatibility
with FeynRules for new physics models implementation, allowing for event
generation for any model that can be written in the form of a Lagrangian.
MadGraph 5 builds on the same philosophy as the previous versions, and its
design allows it to be used as a collaborative platform where theoretical,
phenomenological and simulation projects can be developed and then distributed
to the high-energy community. We describe the ideas and the most important
developments of the code and illustrate its capabilities through a few simple
phenomenological examples.Comment: 37 pages, 5 figures, 7 table
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