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 √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. The search results in the most stringent upper limits to date on the branching fractions ℬ(𝑊±→𝜋±𝛾)<1.9×10−6, ℬ(𝑊±→𝐾±𝛾)<1.7×10−6, ℬ(𝑊±→𝜌±𝛾)<5.2×10−6 at 95% confidence level.
Search for the Exclusive 𝑊 Boson Hadronic Decays 𝑊±→𝜋±𝛾, 𝑊±→𝐾±𝛾 and 𝑊±→𝜌±𝛾 with the ATLAS Detector
M. Cristoforetti;A. Di Luca
2024-01-01
Abstract
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 √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. The search results in the most stringent upper limits to date on the branching fractions ℬ(𝑊±→𝜋±𝛾)<1.9×10−6, ℬ(𝑊±→𝐾±𝛾)<1.7×10−6, ℬ(𝑊±→𝜌±𝛾)<5.2×10−6 at 95% confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
