Browsing by Author "Cabarcas J.M."
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Item B meson anomalies within the triplet vector boson model to the light of recent measurements from LHCb(American Physical Society, 2024) Cabarcas J.M.; Muñoz J.H.; Quintero Poveda, Néstor; Rojas, EduardoThe 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→sμ+μ- and b→cτν¯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(∗)τν¯τ)/BR(B→D(∗)ℓ′ν¯ℓ′), R(Λc)=BR(Λb→Λcτν¯τ)/BR(Λb→Λcμν¯μ), and RK(∗)=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 (BABAR, Belle, and LHCb) on R(D(∗)). Future measurements will be required in order to clarify such a situation.Item Implications of NSI constraints from ANTARES and IceCube on a simplified Z′ model(Elsevier B.V., 2024) Cabarcas J.M.; Parada, Alexander; Quintero Poveda, NéstorRecently the neutrino experiments ANTARES and IceCube have released new constraints to the non-standard neutrino interaction (NSI) parameter ϵμτd (flavor off-diagonal). These new constraints are stronger than those obtained from a combination of COHERENT and neutrino oscillation data. In the light of the recent constraints from ANTARES and IceCube data on the NSI parameter ϵμτd, in this work, we study the new physics implications on the parameter space of a simplified Z′ model with lepton flavor violating (μτ) couplings. For a Z′ boson with a mass heavier than the τ lepton, our results show that ANTARES and IceCube can provide additional constraints to such a new physics scenario with μτ couplings, when compared to bounds from low-energy flavor physics. Moreover, these neutrino experiments can exclude a similar region than ATLAS experiment, showing the potential to provide complementary information to the one obtained from direct searches at the Large Hadron Collider. The impact of the expected sensitivity at DUNE and Belle II experiments is also studied.