2017/04/30 by Alejandro Celis, Javier Fuentes-Martín, Javier Fuentes-Martin +2 · 3 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dimension (graph theory) #Effective field theory #Electroweak interaction #Electroweak scale #Gauge (firearms) #Gauge symmetry #Gauge theory #Invariant (physics) #Lepton #Mathematical physics #Mathematics #Nuclear physics #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Pure mathematics #Quantum mechanics #Standard Model (mathematical formulation) #hep-ph
paper · pdf · doi:10.1103/physrevd.96.035026
published as Phys. Rev. D 96, 035026 (2017) · 10 pages, 2 figures, 3 tables. v2: references added, typos corrected, improved discussion in Sec. V, corrected coefficient of C7 in formula for RKstar in the low-bin, new figure with global fit in terms of SMEFT coefficients. Conclusions unchanged. v3: minor addition, shorter version to be published in PRD
openalex created_date 2017/05/05 · arxiv created 2017/08/09 · openalex publication_date 2017/08/25 · arxiv updated 2017/08/30 · openalex updated_date 2026/08/05
We study the implications of the recent measurements of RK and R_K* by the LHCb Collaboration. We do that by adopting a model-independent approach based on the Standard Model effective field theory (SMEFT), with the dominant new physics (NP) effects encoded in the coefficients of dimension-6 operators respecting the full Standard Model (SM) gauge symmetry. After providing simplified expressions for RK and R_K*, we determine the implications of the recent LHCb results for these observables on the coefficients of the SMEFT operators at low and high energies. We also take into account all b\ensuremath→s\ensuremathℓ\ensuremathℓ data, which combined lead to effective NP scenarios with SM pulls in excess of 5\ensuremathσ. Thus, the operators discussed in this paper would be the first dimension-6 terms in the SM Lagrangian to be detected experimentally. Indirect constraints on these operators are also discussed. The results of this paper transcend the singularity of the present situation and set a standard for future analyses in b\ensuremath→s transitions when the NP is assumed to lie above the electroweak scale.