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New methods for precision predictions at the LHC.

Funded Value:223,124

Funded Period:Oct 16 - Mar 19

Funder:STFC

Project Status:Active

Project Category:Research Grant

Project Reference:ST/M004104/2

Experiments carried out during the first phase of the Large Hadron Collider (LHC) have produced one of the most fundamental discoveries in recent times through the observation of the Higgs boson. Predicted more than 50 years ago this last missing ingredient of the Standard Model offers an explanation for the origin of mass and electro-weak forces. Despite this, the origins of the Standard Model and it's place within models for cosmological and astrophysical observations remain unclear.

The second phase of the LHC, which runs until 2018 at twice the energy of phase one, aims to study the properties of this new boson and uncover the true structure of the electro-weak symmetry breaking scale. Astrophysical and cosmological observations predict new forms of matter and energy as yet unexplained by the Standard Model and there are many conjectured theories which point towards new physics around the electro-weak scale at an energy of 1-2 TeV.

Studies of the data from run I of the LHC indicate the expected signals of new physics may be harder to find than originally hoped and it is for this reason that precision predictions and detailed analyses will become the focus for future LHC experiments. The project "New methods for precision predictions at the LHC" addresses the need for new theoretical tools which currently limit our ability to make precision predictions at hadron colliders like the LHC.

Hadron colliders produce huge amounts of strongly interacting radiation that must be precisely modelled if we hope to find the tiny signatures that high energy models of new physics predict. This is an extremely challenging task within the framework of Quantum-Chromo-Dynamics (QCD), our model for the strong interaction, where even perturbative approximations quickly run into areas pushing the boundaries of mathematics and computational power. Owing to the relatively large size of the strong coupling constant, high order expansions within QCD are required in order to keep the theoretical uncertainties under control and in line with the experimental errors.

Despite these challenges remarkable progress has been made in recent years that now allow predictions at next-to-leading order in the pertubative expansion to be made for a wide variety of different processes. A particular highlight of these developments is the ability to look at high multiplicity processes which give access to much more flexible analyses. However, these methods are restricted to an accuracy of between 10 and 20% which is above the projected precision expected from phase two collisions. In order to make sure the theory is ready to handle the new data we must now focus on finding new solutions for higher multiplicity QCD predictions at higher order in perturbation theory and push predictions towards 5% precision.

New mathemati

Project completion date : 2019-03-31 12:00:00

Major organization : DURHAM UNIVERSITY

Address : Old Shire Hall,

Old Elvet,

Durham,

County Durham,

DH1 3HP

Country :United Kingdom

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Publication:Mena Report
Date:Feb 4, 2019
Words:509
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