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Precision jet physics from effective field theory

English title Precision jet physics from effective field theory
Applicant Becher Thomas
Number 165786
Funding scheme Project funding
Research institution Institut für Theoretische Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Theoretical Physics
Start/End 01.04.2016 - 31.03.2018
Approved amount 128'118.00
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Keywords (6)

particle physics; resummations of perturbation theory; quantum chromodynamics; soft-collinear effective theory; hadronic collisions; effective field theory

Lay Summary (German)

Lead
Um die Daten zu interpretieren, welche der Large Hadron Collider (LHC) am CERN sammelt, und darin nach Spuren von neuartigen Teilchen und Wechselwirkungen zu suchen, braucht es theoretische Vorhersagen für die Streuprozesse, welche bei Teilchenkollisionen auftreten. Präzise Vorhersagen sind wichtig, weil schwere, neue Teilchen innert kürzester Zeit wieder in leichte, bekannte Teilchen zerfallen. Die Effekte neuer Physik sind deshalb in der Regel nur indirekt nachweisbar, als Abweichungen einer Messung von den theoretischen Vorhersagen im Rahmen der Standard Modells der Teilchenphysik. Aufgrund der hohen Kollisionsenergie werden am LHC Teilchenjets produziert, bei welchem viele Teilchen in ähnliche Richtungen im Detektor fliegen. Solche Prozesse können mittels Störungsrechnung näherungsweise berechnet werden, in einer Entwicklung in der Stärke der Wechselwirkungen zwischen den Teilchen.
Lay summary
Das vorliegende Projekt entwickelt neue Methoden, um genauere Vorhersagen für Streuprozesse am LHC zu erhalten, insbesondere für Jet-Prozesse bei denen mehrere, verschiedene physikalische Skalen eine Rolle spielen. In solchen Prozessen sind Korrekturen durch Logarithmen des Verhältnisses der verschiedenen Skalen erhöht. Diese sogenannten Sudakov-Logarithmen können zu einem Zusammenbruch der Störungsrechnung führen. Um präzise Vorhersagen auch für solche Prozesse zu erhalten, werden im Rahmen des Projekts effektive Quantenfeldtheorien benutzt, um die Physik bei verschiedenen Skalen zu trennen. Ziel des Projektes ist die Entwicklung einer neuen effecktiven Theorie, welche es erlaubt Sudakov-Logarithmen auch in Jet-Prozessen zu summieren. 
Direct link to Lay Summary Last update: 18.04.2016

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Non-global and rapidity logarithms in narrow jet broadening
Becher Thomas, Rahn Rudi, Shao Ding Yu (2017), Non-global and rapidity logarithms in narrow jet broadening, in JHEP, 10, 030-030.
Factorization and Resummation for Jet Processes
Becher Thomas, Neubert Matthias, Rothen Lorena, Shao Ding Yu (2016), Factorization and Resummation for Jet Processes, in JHEP, 11, 019-019.
Factorization for the light-jet mass and hemisphere soft function
Becher Thomas, Pecjak Benjamin D., Shao Ding Yu (2016), Factorization for the light-jet mass and hemisphere soft function, in JHEP, 12, 018-018.

Collaboration

Group / person Country
Types of collaboration
R. Frederix/TUM München Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. M. Neubert/Universität Mainz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Pecjak, Benjamin/Durham U., IPPP Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
L. Rothen/DESY Hamburg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
SCET 2018 (XVth annual workshop on Soft-Collinear Effective Theory) Talk given at a conference Event-based Transverse Momentum Resummation 19.03.2018 Amsterdam, Netherlands Hager Monika;
Annual Theory Meeting Talk given at a conference Effective field theory for QCD processes 18.12.2017 Durham, Great Britain and Northern Ireland Becher Thomas;
Summer School: EFT in Particle Physics and Cosmology Talk given at a conference Soft-Collinear Effective Theory, lectures (8h) 03.07.2017 Les Houches, France Becher Thomas;
Radiative Corrections at the Intensity Frontier of Particle Physics Talk given at a conference SCET for precision physics at high and low energies 12.06.2017 Waterloo, Canada Becher Thomas;
Special QCD symposium Talk given at a conference EFT for interjet energy flow 21.03.2017 Zürich, Switzerland Becher Thomas;
SCET 2017 (XIVth annual workshop on Soft-Collinear Effective Theory) Talk given at a conference Factorization for the light-jet mass and hemisphere soft function 14.03.2017 Detroit, United States of America Becher Thomas;
Future challenges for precision QCD Talk given at a conference Resummation of global and non-global logarithms 25.10.2016 Durham, Great Britain and Northern Ireland Becher Thomas;
Effective Field Theories for Collider Physics, Flavor Phenomena and Electroweak Symmetry Breaking Talk given at a conference Resummation for jet processes 12.09.2016 Eltville am Rhein, Germany Becher Thomas;
QCD@LHC 2016 Talk given at a conference Soft-Collinear Effective Field Theory 22.08.2016 Zürich, Switzerland Becher Thomas;
Higgs Centre School of Theoretical Physics Talk given at a conference Soft-Collinear Effective Field Theory and Collider Physics, lectures (10h) 23.05.2016 Edinburgh, Great Britain and Northern Ireland Becher Thomas;


Knowledge transfer events

Active participation

Title Type of contribution Date Place Persons involved


Associated projects

Number Title Start Funding scheme
153294 Precision jet physics from effective field theory 01.04.2014 Project funding
182038 Precision jet physics from effective field theory 01.10.2018 Project funding

Abstract

The goal of our project are precision predictions for collider physics observables which involve disparate scales. Scale hierarchies can arise due to experimental cuts, or when analyzing more exclusive quantities, such as the substructure of hadronic jets. They lead to enhanced higher-order terms in perturbative computations. Thanks to a recent breakthrough in our research, the effective-field-theory methods we use to resum the large higher-order corrections to all orders can now be applied to a much wider class of observables, in particular also to genuine jet cross sections, the most important category of LHC observables. In the present project, we will develop methods to solve the associated renormalization-group equations and then use our new framework to obtain improved predictions for cone-jet cross sections. In addition, we will automate the higher-logarithmic resummation of a simpler observable, namely the transverse momentum spectrum of (one or several) electroweak bosons.
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