arXiv 0903.27292009-03-16hep-ph

HERA的美丽、魅力和$F_L$：新数据与早期预测

Beauty, charm and $F_L$ at HERA: new data vs. early predictions

N. N. Nikolaev, V. R. Zoller

备注：: 16 pages, 4 figures. The contribution to the volume in honor of Lev Okun's 80 birthday
发表信息：: Phys.Atom.Nucl.73:672-679,2010
DOI：: 10.1134/S1063778810040137

摘要：

渐近自由度的一个著名效应是在复角动量平面上将前导- $\log$ BFKL pomeron分裂成一系列孤立的极点。在我们早期的工作之后，我们探索了质子的小- $x$魅力（$F_2^c$）和美（$F_{2}^{b}$）结构函数的新兴BFKL-Regge因子化展开的唯象后果。正如我们之前发现的，BFKL动力学的色偶极方法预测了在中等大的$Q^{2}$下，子引导硬BFKL交换与$F_2^c$的唯一解耦。我们预测早熟的BFKL渐近$F_2^c(x,Q^2)$与截距的最右边的BFKL极点$α_{\Pom}(0)-1=Δ_{\Pom}\approx 0.4$。高能量开放式美容照片和电生产探测真空交换在更小的距离，并检测到显着的修正BFKL渐近来自次领先的真空极点。鉴于小$x$ $F_{2}^{c}$和$F_{2}^{b}$的实验数据的积累，我们将我们早期的预测扩展到新的HERA测量所覆盖的运动学域。我们在1999年获得的结构函数与2006年发表的H1对$F_2^c$和$F_2^b$的测定一致，但与最近（2008年，初步）H1对$F_2^b$的结果相矛盾。我们还提出了我们的纵向结构函数$F_L$的早期预测与最近的H1数据（2008年）在非常低的比约肯$x$的比较。本文评述了Okun-Pomeranchuk定理的电磁修正。

英文摘要：

One of the well known effects of the asymptotic freedom is splitting of the leading-$\log$ BFKL pomeron into a series of isolated poles in complex angular momentum plane. Following our earlier works we explore the phenomenological consequences of the emerging BFKL-Regge factorized expansion for the small-$x$ charm ($F_2^c$) and beauty ($F_{2}^{b}$) structure functions of the proton. As we found earlier,the color dipole approach to the BFKL dynamics predicts uniquely decoupling of subleading hard BFKL exchanges from $F_2^c$ at moderately large $Q^{2}$. We predicted precocious BFKL asymptotics of $F_2^c(x,Q^2)$ with intercept of the rightmost BFKL pole $α_{\Pom}(0)-1=Δ_{\Pom}\approx 0.4$. High-energy open beauty photo- and electro-production probes the vacuum exchange at much smaller distances and detects significant corrections to the BFKL asymptotics coming from the subleading vacuum poles. In view of the accumulation of the experimental data on small-$x$ $F_{2}^{c}$ and $F_{2}^{b}$ we extended our early predictions to the kinematical domain covered by new HERA measurements.Our structure functions obtained in 1999 agree well with the determination of both $F_2^c$ and $F_2^b$ by the H1 published in 2006 but contradict to very recent (2008, preliminary) H1 results on $F_2^b$. We present also comparison of our early predictions for the longitudinal structure function $F_L$ with recent H1 data (2008) taken at very low Bjorken $x$. We comment on the electromagnetic corrections to the Okun-Pomeranchuk theorem.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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