Resummation of double collinear logs in BK evolution versus HERA data

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• 作者：Javier L. Albacete ^{albacete@ugr.es}
• 关键词：Deep inelastic scattering ; Small-x non-linear evolution ; Saturation physics ; HERA data
• 刊名：Nuclear Physics A
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：957
• 期：Complete
• 页码：71-84
• 全文大小：414 K
• 卷排序：957

文摘

We present a global fit to HERA data on the reduced cross section measured in electron–proton collisions in the region of small Bjorken-x  : x≤x0=10−2x≤x0=10−2 and moderate to high values of the virtuality Q2<Qmax2=650 GeV2. The main dynamical ingredients in the fits are two recently proposed improved BK equations for the description of the small-x evolution of the dipole scattering amplitude  and . These two new equations provide an all-order resummation of double collinear logarithms that arise beyond leading logarithmic accuracy. We show that a very good description of data is possible in both cases, provided the parent dipole or smallest dipole prescriptions are employed for the running of the coupling.