B meson anomalies within the triplet vector boson model to the light of recent measurements from LHCb

• Published in: Physical review. D 2024-01, Vol.109 (1), Article 015029
• Main Authors: Cabarcas, J. M., Muñoz, J. H., Quintero-Poveda, Néstor, Rojas, Eduardo
• Format: Article
• Language: English
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.109.015029

The triplet vector boson (TVB) is a simplified new physics model involving massive vector bosons transforming as a weak triplet vector. Such a model has been proposed as a combined explanation of the anomalous b → s μ + μ − and b → c τ ν ¯ τ data (the so-called B meson anomalies). In this work, we carry out a revamped view of the TVB model by incorporating the most recent 2022 and 2023 LHCb measurements on the lepton-flavor universality ratios R ( D ( * ) ) = BR ( B → D ( * ) τ ν ¯ τ ) / BR ( B → D ( * ) ℓ ′ ν ¯ ℓ ′ ) , R ( Λ c ) = BR ( Λ b → Λ c τ ν ¯ τ ) / BR ( Λ b → Λ c μ ν ¯ μ ) , and R K ( * ) = BR ( B → K ( * ) μ + μ − ) / BR ( B → K ( * ) e + e − ) . We perform a global fit to explore the allowed parameter space by the new data and all relevant low-energy flavor observables including the recent experimental progress from Belle, Belle II, and LHCb. Our results are confronted with the recent high-mass dilepton searches at the LHC. We find that for a heavy TVB mass of 1 TeV a common explanation of the B meson anomalies is possible for all data with the recent LHCb measurements on R ( D ( * ) ) , consistent with LHC constraints. However, this framework is in strong tension with LHC bounds when one considers all data along with the world average values reported by the Heavy Flavor Averaging Group (, Belle, and LHCb) on R ( D ( * ) ) . Future measurements will be required in order to clarify such a situation.