论文标题
四环大N_F对非单词结构函数F_2和F_L贡献
Four-loop large-n_f contributions to the non-singlet structure functions F_2 and F_L
论文作者
论文摘要
我们已经计算了N_F^2和N_F^3在强耦合alpha_s中在第四阶的包容性深弹性散射中对风味非单词结构函数F_2和F_L的贡献。系数函数是通过使用微分方程方法计算大量的Mellin-N矩来获得的，然后从中确定N和Bjorken-X中的分析形式。我们的新n_f^2术语在数值上比已经知道的n_f^3领先的大NF零件大得多。他们同意对阈值和高能重新调整的预测。此外，我们的计算证实了相应异常尺寸的四环N_F^2部分的较早确定。通过NO-PI^2猜想/定理的欧几里得物理量，我们预测非单词Quark分布的演变的第五阶异常维度的Z4 N_F^3部分。
We have calculated the n_f^2 and n_f^3 contributions to the flavour non-singlet structure functions F_2 and F_L in inclusive deep-inelastic scattering at the fourth order in the strong coupling alpha_s. The coefficient functions have been obtained by computing a very large number of Mellin-N moments using the method of differential equations, and then determining the analytic forms in N and Bjorken-x from these. Our new n_f^2 terms are numerically much larger than the n_f^3 leading large-nf parts which were already known; they agree with predictions of the threshold and high-energy resummations. Furthermore our calculation confirms the earlier determination of the four-loop n_f^2 part of the corresponding anomalous dimension. Via the no-pi^2 conjecture/theorem for Euclidean physical quantities, we predict the z4 n_f^3 part of the fifth-order anomalous dimension for the evolution of non-singlet quark distributions.
