Project description
Pioneering strange-flavour-tagging algorithm supports search for new physics
The q2 distribution of the rare hyperon decay ‘Sigma-to-p mu+ mu-’ – where a sigma hyperon containing one strange quark decays into a proton and a pair of muons – is a critical observable for testing the standard model and the existence of new physics. This rare decay was recently observed with high precision in the Large Hadron Collider beauty experiment. With the support of the Marie Skłodowska-Curie Actions programme, the FOUNDRY project aims to overcome challenges with interpreting the data via a pioneering strange-flavour-tagging algorithm. By developing models with unparalleled precision, FOUNDRY will work to deliver the world’s first measurements of key components in the q2 distribution of Sigma-to-p mu+ mu- decays.
Objective
This proposal, FOUNDRY, will establish a new production line for discovery in the strange sector. It aims to deliver the world's first measurements of the differential branching fraction and forward-backward asymmetry in the q2 distribution of Sigma to p mumu decays. Simultaneously, an essential tool facilitating future exploration will be created, the inaugural strange flavour-tagging algorithm at LHCb.
This project directly addresses the primary obstacle in interpreting experimental data: the 8-fold model-dependent ambiguity in the dimuon mass spectra that obscures the absolute branching fraction. To achieve the systematic precision necessary to distinguish between degenerate solutions in data, we aim to meet the primary challenge of developing a state-of-the-art efficiency model in bins of q2. This will enable a precise efficiency correction of the raw signal yields, yielding a definitive test of Standard Model predictions in the strange-baryon sector. Utilizing the vastly increased Sigma+ dataset from LHCb's Run 3, these advanced methodologies are poised for a transformative measurement. Any observed deviation from Standard Model expectations could provide clear evidence of New Physics in s to p mumu transitions, a sector with a known history of anomalies.
The host institution, the University of A Coruña, Spain, offers an optimal environment for this groundbreaking research, with proven expertise in rare-strange-decay analyses and strategic leadership as primary developers of LHCb's inclusive b-hadron flavour-tagging algorithm. This fellowship will be pivotal for the researcher's career, enabling knowledge transfer from high-statistics charm and beauty physics, expanding the host's programme into high-statistics strange decays, acquiring new skills in flavour tagging, and fostering international collaboration within the Spanish and Chinese research communities.
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Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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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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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.
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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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(opens in new window) HORIZON-MSCA-2025-PF
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15001 La Coruna
Spain
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