Soft-Gluon Resummation for Bottom Fragmentation in Top Quark Decay
نویسندگان
چکیده
We study soft-gluon radiation in top quark decay within the framework of perturbative fragmentation functions. We present results for the b-quark energy distribution, accounting for soft-gluon resummation to next-to-leading logarithmic accuracy in both the MS coefficient function and in the initial condition of the perturbative fragmentation function. The results show a remarkable improvement and the b-quark energy spectrum in top quark decay exhibits very little dependence on factorization and renormalization scales. We present some hadron-level results in both xb and moment space by including non-perturbative information determined from e+e− data.
منابع مشابه
ar X iv : h ep - p h / 01 10 31 9 v 1 2 4 O ct 2 00 1 Bottom Quark Fragmentation in Top Quark Decay
We study the fragmentation of the b quark in top decay in NLO QCD, within the framework of perturbative fragmentation, which allows one to resum large logarithms ∼ log(m 2 t /m 2 b). We show the b-energy distribution, which we compare with the exact O(α S) result for a massive b quark. We use data from e + e − machines in order to describe the b-quark hadronization and make predictions for the ...
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