Project description
Extending the Standard Model by computing isospin breaking effects in hadronic precision observables
For high-precision observables like the anomalous magnetic moment of the muon, the prediction of hadronic contributions computed by Lattice quantum chromodynamics (QCD) demands a level of precision where isospin breaking effects (IBE) cannot be overlooked. Therefore, IBE must be included in the theory computation. Supported by the Marie Skłodowska-Curie Actions programme, the IsoPrec project proposes to compute IBE in the valence quark sector in the hadronic vacuum polarisation contribution and in associated observables by means of Lattice QCD+QED (quantum electrodynamics), also factoring in operator renormalisation and quark-disconnected contributions. Notably, the renormalisation constant of the local vector current is determined based on the vector Ward identity, allowing computation of the valence-quark IBE in quark-connected and quark-disconnected contributions.
Objective
Lattice quantum chromodynamics (QCD) allows for first-principle theory predictions of hadronic observables in the non-perturbative regime of the strong interaction. In this approach QCD is solved by means of Monte Carlo simulations in finite volumes on a Euclidean space-time lattice. For high precision observables such as the anomalous magnetic moment of the muon the prediction of hadronic contributions computed by Lattice QCD has reached a level of precision at which isospin breaking effects (IBE), i.e. effects caused by the electric charge of quarks due to quantum electrodynamics (QED) and the mass non-degeneracy of up and down quarks, cannot be neglected and therefore have to be included into the theory computation. Due to an existing tension between the experimental determination and the theory prediction the anomalous magnetic moment of the muon is a candidate for BSM physics. The hadronic vacuum polarisation contribution to this observable dominates the overall uncertainty of the theory prediction. As the uncertainties of the experimental results will significantly decrease in the upcoming years a precise prediction is of high importance. With a few exceptions IBE are commonly only included at the level of valence quark effects in quark-connected contributions. This project aims to compute IBE in the valence quark sector in the hadronic vacuum polarisation contribution and in related observables by means of Lattice QCD+QED, also focussing on operator renormalisation and quark-disconnected contributions, where noise reduction techniques have to be applied. In particular, the renormalisation constant of the local vector current is determined based on the vector Ward identity and valence-quark IBE in quark-connected and quark-disconnected contributions are computed. The fellowship allows the fellow to pursue research goals in this field and to further sharpen his profile. It marks the next crucial step in his academic career aiming for a long-term position.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences theoretical physics particle physics leptons
- natural sciences physical sciences theoretical physics particle physics quarks
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) HORIZON-MSCA-2024-PF-01
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
1211 GENEVE 23
Switzerland
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