Angular measurements play a crucial role in particle physics, offering precise insights into the dynamics of particle interactions and decays, and providing a sensitive tool for testing theoretical predictions. In particular, the ATLAS Run 2 quadruple-differential analysis of single top quark production in the t-channel provides detailed access to the phase space by measuring the spherical coordinates of the W boson and its leptonic decay products, allowing for stringent constraints on Effective Field Theory parameters and potential new physics beyond the Standard Model.
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