H2020Индивидуална стипендия2015–2017

Soft Gluons · Soft Gluon Physics and Multi-Loop Calculations

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2015-10-01 → 2017-09-30
Финансиране от ЕС: 183 455 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Амплитудите на разсейване при сблъсъци на протони в ускорители се анализират чрез сложни математически интеграли. Точните теоретични изчисления помагат да се открият отклонения от Стандартния модел, които биха разкрили нови физични явления.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Soft Gluon Physics and Multi-Loop Calculations

The fundamental interactions in Nature are studied nowadays by means of large accelerators, like the Large Hadron collider (LHC), at CERN. Two proton beams are accelerated close to the velocity of light and collide at selected points, producing a plethora of particles. The type and rate at which particles are produced is dictated by the fundamental interactions: the study of these collisions gives us access to the dynamics of particle scattering and thus to the structure of the fundamental interactions. Our current knowledge of fundamental interactions is based on the Standard Model of Particle Physics, which describes well all physical phenomena from the scale of everyday life down to the Fermi scale (~ 10^(-15) meters). Experiments at the LHC allows us to explore for the first time physics at shorter distance scales, and new phenomena are expected to appear. However, any such phenomenon will occur in the background of Standard Model interactions, and therefore will show up as small deviations from the theoretical predictions obtained using the Standard Model. In order to identify these deviations we need precise theoretical predictions. There has been a worldwide effort among theoretical physicists over the past few years, devoted to producing accurate predictions for scattering processes at the LHC. A large part of this effort has been aimed at calculating scattering amplitudes, the basic object describing a scattering process. These functions are given in terms of complicated integrals, and there exist no general methods to perform these calculations. For this reason, much effort has been directed to studying the analytic structure of scattering amplitudes. This is the context in which the present action has been conceived. The aim of this project has been to study scattering amplitudes in specific kinematic limits of interest, namely, particle scattering near threshold, and in the high-energy limit. The objectives were to understand the factorisation structure of amplitudes in these limits and identify iterative structures which would allow one to calculate them as iterated integrals. The project has been successful, and the outcome of this research will be useful in the first place to the community of theoretical physicists. The results obtained will help them to further characterise analytic properties of scattering amplitudes, and to produce precise calculations, which in turn can be contrasted with experimental data from the LHC. This work will be useful for the society as a whole, as it contributes towards the common effort of advancing our knowledge of quantum field theory, and thus our knowledge of fundamental interactions in Nature.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The start of the LHC at CERN and the discovery of the Higgs boson in 2012 started a new era in particle physics. After fifty years from its prediction, the Standard Model (SM) of particle physics has received its final experimental confirmation. There are many experimental and theoretical observations which suggest that new physics should be present at energies slightly above the electroweak scale. Two years of LHC running, however, made clear that such new physics will show up only as small deviations from the SM. This opens up the quest for precision particle physics. It involves our ability to predict scattering amplitudes with the smallest uncertainty possible, a task which relies on our understanding of quantum chromodynamics. This is currently the main task of the theoretical high-energy physics community, and this project addresses issues that are at the heart of this endeavour. Scattering processes at the LHC involve multiple scales, and very often become sensitive, through multi-loop corrections, to scales far lower than the hard interaction. This is the physics of soft gluons, which is the subject of my proposal. I aim at improving our knowledge and treatment of the physics of soft gluons. I will do this by working in parallel on four tasks: - calculating soft gluon webs at higher orders in perturbation theory, needed to understand the nature of soft gluon radiation to all-orders; - developing a framework for the resummation of next-to-eikonal soft gluons, needed for improving our ability to obtain precise prediction at LHC; - developing tools for automatising the treatment of soft gluon radiation in scattering processes, which will directly serve the experimental community. - investigating factorisation properties of scattering amplitudes in the high-energy limit, the so-called Regge limit.These goals are important for the exploitation of the LHC and will have a major impact in the field.

Оригинален текст от CORDIS (на английски).

Участници

THE UNIVERSITY OF EDINBURGH · EdinburghКоординаторОбединеното кралство