کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10723701 | 1033882 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The strong coupling and its running to four loops in a minimal MOM scheme
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The strong coupling and its running to four loops in a minimal MOM scheme The strong coupling and its running to four loops in a minimal MOM scheme](/preview/png/10723701.png)
چکیده انگلیسی
We introduce the minimal momentum subtraction (MiniMOM) scheme for QCD. Its definition allows the strong coupling to be fixed solely through a determination of the gluon and ghost propagators. In Landau gauge this scheme has been implicit in the early studies of these propagators, especially in relation to their non-perturbative behaviour in the infrared and the associated infrared fixed-point. Here we concentrate on its perturbative use. We give the explicit perturbative definition of the scheme and the relation of its β-function and running coupling to the MS¯ scheme up to 4-loop order in general covariant gauges. We also demonstrate, by considering a selection of Nf=3 examples, that the apparent convergence of the relevant perturbative series can in some (though not all) cases be significantly improved by re-expanding the MS¯ coupling version of this series in terms of the MiniMOM coupling, making the MiniMOM coupling also of potential interest in certain phenomenological applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 681, Issue 4, 9 November 2009, Pages 336-342
Journal: Physics Letters B - Volume 681, Issue 4, 9 November 2009, Pages 336-342
نویسندگان
Lorenz von Smekal, Kim Maltman, André Sternbeck,