MuonHVP - Muon HVP and Smeared R-ratio from Lattice QCD
The goal of this project is to establish a pioneering excellence hub for globally competitive research in particle physics through state-of-the-art lattice QCD+QED simulations. A primary focus is addressing the longstanding "muon g-2 puzzle": the notable discrepancy between experimental measurements and theoretical predictions of the muon's anomalous magnetic moment, which has persisted at a 3-4 standard deviation for over a decade. Recent experimental advancements have achieved unprecedented accuracy, while theoretical predictions have traditionally relied on phenomenological inputs, specifically the RRatio, to estimate the Hadronic Vacuum Polarization (HVP) contribution. To circumvent the limitations of data-driven approaches and derive a first-principle Standard Model (SM) prediction, several lattice collaborations have embarked on calculating the HVP contribution using lattice QCD simulations. This endeavour is exceptionally challenging and computationally demanding, with the BMW collaboration being the only group to date to achieve high accuracy and comprehensive control of systematic effects.
Our excellence hub aims to further this pioneering work, pushing the frontiers of precision in theoretical particle physics. In particular, using ensembles of gauge configurations at physical values of the u,d,s, and c quark masses, produced by the Extended Twisted Mass Collaboration (ETMC), we will compute the muon HVP contribution, the energy-smeared R-ratio, as well as inclusive hadronic tau-meson decay rates, providing critical information on CKM matrix elements. For the first time, we will include leading-order isospin breaking effects (LIBE) to correct our iso-symmetric QCD results to QCD+QED. This comprehensive approach will enable us to achieve unprecedented accuracy in our theoretical predictions, enhancing our understanding of the Standard Model and its potential extensions.
CyI Principal Investigator: Dr. Ferenc Pittler
Additional Info
- Acronym: MuonHVP
- Website: Under construction
- Center: CaSToRC
- Funding Source: RIF/EXCELLENCE/0524
- CyI Funding: €200.000
- Funding Period: --
- Starting Date: 01/05/2025
- End Date: 30/04/2027
- Coordinator: THE CYPRUS INSTITUTE
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Partners:
UNIVERSITY OF CYPRUS
Foreign Research Organizations: University of Tor Vergata and INFN, CERN – Theoretical Physics Department
