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High Impact Cross-section Calculations for Unprecedented Precision

Objective

"The first runs of the Large Hadron Collider (LHC) experiment just finished. The LHC was successful in discovering a particle compatible with the Higgs boson of the Standard Model (SM). However expectations to discover New Physics have not been met so far.

In order to establish whether the new resonance is the SM Higgs boson, or not, precise measurements of its properties are mandatory. These require accurate predictions for cross-sections involving the Higgs boson, as well as for SM backgrounds, that need to be subtracted accurately. Furthermore, since so far New Physics has been elusive, it will be even more important to extend the range of these searches as much as possible. This requires a solid control of SM backgrounds.

This project aims at pushing the frontier of precision QCD calculations to reach an unprecedented precision for collider
processes. The project is divided into two main parts.

In the first part the PI will formulate a general procedure to merge different calculations at next-to-leading order (NLO) level. This will lead to the construction of an event generator for two-to-one and two-to-two scattering processes at next-to-next-to-leading order (NNLO), including parton shower corrections, essentially upgrading the POWHEG NLO generator to the NNLO level. Depending on the process considered, a significant reduction of the theoretical errors, by a factor 2-4, will be achieved.

The second part focuses on extending the accuracy of resummed predictions for important QCD observables from next-to-leading logarithmic to next-to-next-to-leading logarithmic level, again achieving a substantial reduction of the theoretical error. The observables considered include, besides event-shapes and jet-rates, also jet-veto predictions in Higgs + 1 or 2 jet events.

Besides the groundbreaking impact on present LHC physics measurements, these results will also be essential to match the high accuracy of measurements at a future linear collider."

Field of science

  • /natural sciences/physical sciences/theoretical physics/particles/particle accelerator
  • /natural sciences/physical sciences/theoretical physics/particles/higgs boson

Call for proposal

ERC-2013-CoG
See other projects for this call

Funding Scheme

ERC-CG - ERC Consolidator Grants

Host institution

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
Address
Esplanade Des Particules 1 Parcelle 11482 De Meyrin Batiment Cadastral 1046
1211 Geneva 23
Switzerland
Activity type
Research Organisations
EU contribution
€ 1 272 686
Principal investigator
Giulia Zanderighi (Prof.)
Administrative Contact
Svetlomir Stavrev (Dr.)

Beneficiaries (2)

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
Switzerland
EU contribution
€ 1 272 686
Address
Esplanade Des Particules 1 Parcelle 11482 De Meyrin Batiment Cadastral 1046
1211 Geneva 23
Activity type
Research Organisations
Principal investigator
Giulia Zanderighi (Prof.)
Administrative Contact
Svetlomir Stavrev (Dr.)
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
United Kingdom
EU contribution
€ 242 112
Address
Wellington Square University Offices
OX1 2JD Oxford
Activity type
Higher or Secondary Education Establishments
Administrative Contact
Gill Wells (Ms.)