2023/11/07 by Leandro Da Rold, Da Rold, Leandro
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2311.04062
openalex publication_date 2023/11/07 · openalex created_date 2023/11/09 · openalex updated_date 2026/08/01
Several experiments have measured a deviation in B→ D(*) semileptonic decays, that point to new physics at the TeV scale violating lepton flavor universality. A scalar leptoquark S1, with a suitable structure of couplings in flavor space, is known to be able to solve this anomaly modifying b→ cτν. In the context of composite Higgs models, we consider a theory containing H and S1 as Nambu-Goldstone bosons (NGBs) of a new strongly interacting sector, with ordinary resonances at a scale \cal O(10) TeV. Assuming anarchic partial compositeness of the Standard Model (SM) fermions we calculate the potential of the NGBs that is dominated by the fermions of the third generation, we compute RD(*) and estimate the corrections to flavor observables by the presence of S1. We find that the SM spectrum and mS1∼ TeV can be obtained with a NGB decay constant of order ∼ 5 TeV. We obtain a robust correlation between the main corrections to RD(*), BK(*)νν and gτ/gμ, that leads to a sever bound on RD(*), roughly 2σ below the experimental value. Besides the bounds on the flavor observables gτW, BR(τ→μγ) and ΔmBs are saturated, with the first one requiring a coupling between resonances g_*\lesssim 2, whereas the second one demands mS1\gtrsim 1.7 TeV, up to corrections of \cal O(1).