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- W2267444199 abstract "In the standard model, the top quark decay width Gamma_t is computed from the exclusive t -> bW decay. We argue in favor of using the three body decays t-> bf_ibar{f}_j to compute Gamma_t as a sum over these exclusive modes. As dictated by the S-matrix theory, these three body decays of the top quark involve only asymptotic states and incorporate the width of the W boson resonance in a natural way. The convolution formula (CF) commonly used to include the finite width effects is found to be valid, in the general case, when the intermediate resonance couples to a conserved current (limit of massless fermions in the case of W bosons). The relation Gamma_t=Gamma(t-> bW) is recovered by taking the limit of massless fermions followed by the W boson narrow width approximation. Although both calculations of Gamma_t are different at the formal level, their results would differ only by tiny effects induced by light fermion masses and higher order radiative corrections." @default.
- W2267444199 created "2016-06-24" @default.
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- W2267444199 date "2001-08-09" @default.
- W2267444199 modified "2023-09-27" @default.
- W2267444199 title "Finite W boson width effects in the top quark width" @default.
- W2267444199 hasPublicationYear "2001" @default.
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