کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1843147 | 1645165 | 2006 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fermionic corrections to the three-loop matching coefficient of the non-relativistic vector current
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Fermionic corrections to the three-loop matching coefficient of the non-relativistic vector current Fermionic corrections to the three-loop matching coefficient of the non-relativistic vector current](/preview/png/1843147.png)
چکیده انگلیسی
In this paper we consider the matching coefficient of the vector current between quantum chromodynamics (QCD) and non-relativistic QCD (NRQCD) to three-loop order in perturbation theory. We evaluate the fermionic corrections containing a closed massless fermion loop. The results are building blocks both for the bottom and top quark system at threshold. We explain in detail the methods used for the evaluation of the Feynman diagrams, classify the occurring master integrals and provide results for the latter. The numerical effects are significant. They have the tendency to improve the behaviour of the perturbative series—both for the bottom and top quark system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 758, Issues 1–2, 4 December 2006, Pages 144–160
Journal: Nuclear Physics B - Volume 758, Issues 1–2, 4 December 2006, Pages 144–160
نویسندگان
P. Marquard, J.H. Piclum, D. Seidel, M. Steinhauser,