Project

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Collider physics with effective field theory methods

Applicant Becher Thomas
Number 130404
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 01.04.2010 - 31.03.2012
Approved amount 211'984.00
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Keywords (10)

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

Lay Summary (English)

Lead
Lay summary
In order to be able to find new physics at the Large Hadron Collider (LHC), it is important to have precise theoretical predictions of collider processes. The biggest challenge in this context is the computation of the effect of the strong interaction described by Quantum Chromo-Dynamics (QCD). For sufficiently inclusive observables, the QCD effects can be calculated in an expansion in the strong coupling constant. However, for quantities involving disparate scales, large logarithms of scale ratios can spoil this expansion. This project aims at further developing effective field theory methods to obtain improved predictions for collider processes. By solving renormalization-group equations in Soft-Collinear Effective Theory, logarithmically enhanced corrections can be resummed to all orders. This framework has successfully been used to perform resummations for simple observables such as inclusive Higgs and Drell-Yan production. The goal of the present project is to extend the method to more exclusive observables, in particular to multi-jet cross sections at the LHC.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Electroweak Gauge-Boson Production at Small $q_T$: Infrared Safety from the Collinear Anomaly
Becher Thomas, Neubert Matthias, Wilhelm Daniel (2012), Electroweak Gauge-Boson Production at Small $q_T$: Infrared Safety from the Collinear Anomaly, in JHEP, 1202, 124-124.
NNLO soft function for electroweak boson production at large transverse momentum
Becher Thomas, Bell Guido, Marti Stefanie (2012), NNLO soft function for electroweak boson production at large transverse momentum, in JHEP, 1204, 034-034.
Resummation for W and Z production at large pT
Becher Thomas, Lorentzen Christian, Schwartz Matthew D. (2012), Resummation for W and Z production at large pT, in Phys.Rev.Lett., 108, 012001-012001.
Drell-Yan production at small q_T, transverse parton distributions and the collinear anomaly
Becher Thomas, Neubert Matthias (2011), Drell-Yan production at small q_T, transverse parton distributions and the collinear anomaly, in Eur.Phys.J., C71, 1665-1665.
Factorization and Resummation for Jet Broadening
Becher Thomas, Bell Guido, Neubert Matthias (2011), Factorization and Resummation for Jet Broadening, in Phys.Lett., B704, 276-283.
The gluon jet function at two-loop order
Becher Thomas, Bell Guido (2011), The gluon jet function at two-loop order, in Phys.Lett., B695, 252-258.
Updated Predictions for Higgs Production at the Tevatron and the LHC
Ahrens Valentin, Becher Thomas, Neubert Matthias, Yang Li Lin (2011), Updated Predictions for Higgs Production at the Tevatron and the LHC, in Phys.Lett., B698, 271-274.
Direct photon production with effective field theory
Becher Thomas, Schwartz Matthew D. (2010), Direct photon production with effective field theory, in JHEP, 1002, 040-040.
Analytic Regularization in Soft-Collinear Effective Theory
Becher Thomas, Bell Guido, Analytic Regularization in Soft-Collinear Effective Theory, in Phys.Lett. , B.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
SCET 2012 27.03.2012 Madrid, Spanien
Workshop QCD@LHC 21.08.2011 St. Andrews, UK
KITP program "Harmony of Scattering Amplitudes" 06.06.2011 Santa Barbara, USA
XLVIth Rencontres de Moriond 13.03.2011 La Thuile, Italien
SCET 2011 06.03.2011 Pittsburgh, USA
CKM 2010 06.09.2010 Coventry, UK
ICHEP 2010 22.07.2010 Paris, Frankreich
Flavour Physics and CP Violation 2010 25.05.2010 Torino, Italien


Associated projects

Number Title Start Funding scheme
140978 Precision collider physics from effective field theory 01.04.2012 Project funding

Abstract

This project aims at further developing effective field theory methods to obtain improved predictions for collider processes. By solving renormalization group equations in Soft-Collinear Effective Theory, we resum logarithmically enhanced contributions to cross sections to all orders in perturbation theory. This framework has successfully been used to perform resummations for simple observables such as inclusive Higgs and Drell-Yan production. The goal of the present project is to extend the method to more exclusive observables, in particular to jet cross sections at the LHC.
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