Search for the Rare Radiative Decay: $W\rightarrow\pi\gamma$ in \ppbar\ Collisions at $\sqrt{s} = 1.96$ TeV

CDF Collaboration; et al; T. Aaltonen

arxiv: 1104.1585 · v1 · pith:QE4MWOA6new · submitted 2011-04-08 · ✦ hep-ex

Search for the Rare Radiative Decay: Wrightarrowπγ in ppbar\ Collisions at sqrt{s} = 1.96 TeV

CDF Collaboration , T. Aaltonen , et al This is my paper

classification ✦ hep-ex

keywords collisionsdecaylimitradiativeraresearchbranchingbratio

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We present a search for the rare radiative decay \wpigamma\ using data corresponding to an integrated luminosity of 4.3 \invfb\ of proton-antiproton collisions at a center of mass energy of 1.96 TeV collected by the CDF experiment at Fermilab. As no statistically significant signal is observed, we set a 95% confidence level upper limit on the relative branching fraction \bratio\ at $6.4\times 10^{-5}$, a factor of 10 improvement over the previous limit.

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Proof-of-principle for hadron-in-fat-jet AI tagging that yields an expected 95% CL limit of B(W±→π±γ) < 2.78×10^{-5} at 450 fb^{-1}.