Reanalysis of the BFKL Pomeron at the next-to-leading logarithmic accuracy
Reanalysis of the BFKL Pomeron at the next-to-leading logarithmic accuracy
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以次领先的对数精度重新分析 BFKL Pomeron
DOI:
10.1007/jhep10(2013)117
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发表时间:
2013-08
期刊:
影响因子:
--
通讯作者:
Zhang, Qiong-Lian
中科院分区:
文献类型:
--
作者:
Wu, Xing-Gang;Wang, Sheng-Quan;Shen, Jian-Ming;Zhang, Qiong-Lian
A bstractWe apply the principle of maximum conformality (PMC) to the Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomeron intercept at the next-to-leading logarithmic (NLL) accuracy. The PMC eliminates the conventional renormalization scale ambiguity by absorbing the non-conformal {βi}-terms into the running coupling, and a more accurate pQCD estimation can be obtained. After PMC scale setting, the QCD perturbative convergence can be greatly improved due to the elimination of renormalon terms in pQCD series, and the BFKL Pomeron intercept has a weak dependence on the virtuality of the reggeized gluon. For example, by taking the Fried-Yennie gauge, we obtain $ \omega_{\mathrm{MOM}}^{\mathrm{PMC}} $(Q2, 0) ∈ [0.149, 0.176] for Q2 ∈ [1, 100] GeV2. This is a good property to apply to the high-energy phenomenology. Further more, to compare with the data, it is found that the physical MOM-scheme is more reliable than the $ \overline{\mathrm{MS}} $-scheme. The MOM-scheme is gauge dependent, which can also be greatly suppressed after PMC scale setting. We discuss the MOM-scheme gauge dependence for the Pomeron intercept by adopting three gauges, i.e. the Landau gauge, the Feynman gauge and the Fried-Yennie gauge, and we obtain $ \omega_{\mathrm{MOM}}^{\mathrm{PMC}} $(Q2 = 15 GeV2, 0) = $ 0.166_{-0.017}^{+0.010 } $; i.e. about 10% gauge dependence is observed. We apply the BFKL Pomeron intercept to the photon-photon collision process, and compare the theoretical predictions with the data from the OPAL and L3 experiments.
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