2,918 research outputs found
Infrared subtraction at next-to-next-to-leading order for gluonic initial states
No full textIn this thesis we describe a procedure for isolating the infrared singularities present in gluonic scattering amplitudes at
next-to-leading and next-to-next-to-leading order. We adopted the
antenna subtraction framework which has been successfully applied to the
calculation of NNLO corrections to the 3-jet cross section and related
event shape distributions in electron-positron annihilation. We consider
processes with coloured particles in the initial state, and in
particular two-jet production in hadron-hadron collisions at
accelerators such as the Large Hadron Collider (LHC). We derive explicit
formulae for subtracting the single and double unresolved contributions
from the double radiation gluonic processes using
antenna functions with initial state partons. We show numerically that
the subtraction term effectively approximates the matrix element in the
various single and double unresolved configurations
Engaging Physics Tutoring: A didactical toolbox for teaching assistants (TAs)
No full text[EN] In this paper we present a project dedicated to the development of a didactical toolbox of material for teaching assistants (TAs) supervising exercise classes for non-physics majors at ETH Zurich. With our materials we were able to support TAs in preparing high-quality exercise sessions for their class which go beyond direct instruction and activate students intellectually and emotionally. The materials are developed for 13 exercise sessions and are presented in the form of an eBook. The materials were immediately used by several TAs in dedicated focus groups. The positive feedback of students and TAs suggests that our material helped to activate and engage the students, enhancing their learning - even in the challenging setting of online teaching.The EPT project was supported by the ETH Zurich Rector’s Impulse Fund.Bondar, V.; Nuber, J.; Zeyen, M.; Schiltz, G.; Dissertori, G. (2021). Engaging Physics Tutoring: A didactical toolbox for teaching assistants (TAs). En 7th International Conference on Higher Education Advances (HEAd'21). Editorial Universitat Politècnica de València. 9-16. https://doi.org/10.4995/HEAd21.2021.12949OCS91
CHIPP Roadmap for Research and Infrastructure 2025–2028 and beyond by the Swiss Particle Physics Community
No full textThis community roadmap presents the visions for future research in particle and astroparticle physics in Switzerland and formulates the needs of these fields in terms of research infrastructure in the years 2025-2028 and beyond. It was established under the auspices of the Swiss Institute of Particle Physics (CHIPP), which issued its first roadmap already in 2004 and conducted dedicated roadmap-planning workshops in 2018 and 2020. The roadmap represents the view of the Swiss scientific community in the field of particle and astroparticle physics and is a formal element of the process to elaborate the Swiss Roadmap for Research Infrastructures 2023. This bottom-up contribution to the identification and selection of important national and international research infrastructures has been coordinated by the Swiss Academy of Sciences (SCNAT) on a mandate by the State Secretariat for Education, Research and Innovation (SERI).Wallny R, Dissertori G, Durrer R, Isidori G, Müller K, Rivkin L, Seidel M, Sfyrla A, Weber M, Benelli A (2021)
CHIPP Roadmap for Research and Infrastructure 2025–2028 and beyond by the Swiss Particle Physics Community. Swiss Academies Reports 16 (6
The socioeconomic impact of large scale research infrastructures: models, methods, and data
No full textIn chapter 16, Bastianin and Florio survey models and methods used to assess the economic and societal impacts of Large Scale Research Infrastructures (LSRIs) and provide a taxonomy of existing frameworks of analysis and then review the methodologies used to quantitatively assess the impacts of LSRIs. They also survey the literature that provides quantitative and qualitative evidence on the effects of LSRIs and discuss methodological policy implications arising from such studies
Measurements of the QCD colour factors at LEP and a limit on the light gluino
No full textA summary of the measurements of the QCD colour factors at LEP is presented. Such measurements provide a test of the gauge group structure underlying the theory of strong interactions. A variety of methods have been applied by the various experiments, and perfect consistency with the expectation of QCD with SU(3) as gauge group is found.A summary of the measurements of the QCD colour factors at LEP is presented. Such measurements provide a test of the gauge group structure underlying the theory of strong interactions. A variety of methods have been applied by the various experiments, and perfect consistency with the expectation of QCD with SU(3) as gauge group is found
Event shapes and power corrections in annihilations
No full textHadronic final states in e+e- annihilitions at centre-of-mass energies from 14GeV up to 189GeV are studied in order to test recent predictions for power corrections to the mean values as well as the distributions of event shape variables.Hadronic final states in e+e- annihilitions at centre-of-mass energies from 14GeV up to 189GeV are studied in order to test recent predictions for power corrections to the mean values as well as the distributions of event shape variables
Electromagnetic calorimetry and performance in CMS
No full textThe electromagnetic calorimeter of the CMS experiment at LHC will consist of about 76000 Lead Tungstate crystals. Its main purpose is the very precise energy measurement of electrons and photons produced in proton-proton collisions at 14 TeV centre-of-mass energy. A review is given of its main building blocks and its construction status. Then the results of the testbeam campaign in 2002 are discussed. Finally, the overall calibration and reconstruction strategy is outlined
The Determination of the Strong Coupling Constant
No full textThe strong coupling constant is one of the fundamental parameters of the standard model of particle physics. In this review I will briefly summarise the theoretical framework, within which the strong coupling constant is defined and how it is connected to measurable observables. Then I will give an historical overview of its experimental determinations and discuss the current status and world average value. Among the many different techniques used to determine this coupling constant in the context of quantum chromodynamics, I will focus in particular on a number of measurements carried out at the Large Electron Positron Collider (LEP) and the Large Hadron Collider (LHC) at CERN
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