Ultrasoft NLL Running of the Nonrelativistic O(v) QCD Quark Potential
arXiv:1102.0269 · doi:10.1007/JHEP06(2011)088
Abstract
Using the nonrelativistic effective field theory vNRQCD, we determine the contribution to the next-to-leading logarithmic (NLL) running of the effective quark-antiquark potential at order v (1/mk) from diagrams with one potential and two ultrasoft loops, v being the velocity of the quarks in the c.m. frame. The results are numerically important and complete the description of ultrasoft next-to-next-to-leading logarithmic (NNLL) order effects in heavy quark pair production and annihilation close to threshold.
25 pages, 7 figures, 3 tables; minor modifications, typos corrected, references added, footnote added
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