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Search for the Exclusive W Boson Hadronic Decays W^{±}→π^{±}γ, W^{±}→K^{±}γ and W^{±}→ρ^{±}γ with the ATLAS Detector.
Phys Rev Lett
October 2024
CERN, Geneva, Switzerland.
A search for the exclusive hadronic decays W^{±}→π^{±}γ, W^{±}→K^{±}γ, and W^{±}→ρ^{±}γ is performed using up to 140 fb^{-1} of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of sqrt[s]=13 TeV. If observed, these rare processes would provide a unique test bench for the quantum chromodynamics factorization formalism used to calculate cross sections at colliders. Additionally, at future colliders, these decays could offer a new way to measure the W boson mass through fully reconstructed decay products.
View Article and Find Full Text PDFWe measure the complete set of angular coefficients J_{i} for exclusive B[over ¯]→D^{*}ℓν[over ¯]_{ℓ} decays (ℓ=e, μ). Our analysis uses the full 711 fb^{-1} Belle dataset with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the B[over ¯]→D^{*} transition and the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}|.
View Article and Find Full Text PDFObservation ofγγ→ττin proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton.
Rep Prog Phys
September 2024
CERN, Geneva, Switzerland.
The production of a pair of τ leptons via photon-photon fusion,γγ→ττ, is observed for the first time in proton-proton collisions, with a significance of 5.3 standard deviations. This observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb.
View Article and Find Full Text PDFArticle Synopsis
- The research presents the first simultaneous measurement of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element V_{ub}, using data from the Belle experiment at the ϒ(4S) resonance.
- It involves analyzing decay events of B mesons to isolate specific decay processes, allowing for a more accurate determination of V_{ub} through a two-dimensional fitting technique.
- The results show values for exclusive and inclusive decay measurements of V_{ub}, which are consistent and indicate that both measurement methods are aligned with the theoretical expectations.
Phenomenological Estimate of Isospin Breaking in Hadronic Vacuum Polarization.
Phys Rev Lett
October 2023
Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Puzzles in the determination of the hadronic-vacuum-polarization contribution currently impede a conclusive interpretation of the precision measurement of the anomalous magnetic moment of the muon at the Fermilab experiment. One such puzzle concerns tensions between evaluations in lattice QCD and using e^{+}e^{-}→hadrons cross-section data. In lattice QCD, the dominant isospin-symmetric part and isospin-breaking (IB) corrections are calculated separately, with very different systematic effects.
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