2024/04/09 by David Marzocca, Marzocca, David, Marco Nardecchia +5
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2404.06533
openalex publication_date 2024/04/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the implications of the observed excess in B+ → K+ νν under the assumption of Rank-One Flavour Violation, i.e. that New Physics couples to a single specific direction in flavour space. By varying this direction we perform analyses at the level of the low-energy EFT, the SMEFT, and with explicit mediators such as leptoquarks and colorless vectors (Z^′ and V^′). We study correlations with other flavour, electroweak and collider observables, finding that the most interesting ones are with K → πνν, Bs → μ+ μ-, meson mixing and the LHC searches in τ+ τ- high-energy tails. Among the various mediators, the scalar leptoquarks R2 and S1 offer the best fits of the Belle-II excess, while being consistent with the other bounds. On the other hand, colorless vectors are strongly constrained by meson mixing and resonance searches in p p → τ+ τ-. In all cases we find that a flavour alignment close to the third generation is generically preferred.