A comment on the LLA method, the kT jet algorithm and the BFKL theory

Semiclassical solution to the BFKL equation with massive gluons

In this paper we proceed to study the high energy behavior of a scattering amplitudes in the Yang-Mills theory with the Higgs mechanism for the gauge boson mass. The spectrum of the $j$-plane singularities of the $t$-channel partial waves, and corresponding eigenfunctions of the BFKL equation in leading log approximation (LLA), were previously calculated by us numerically in arXiv:1401.4671 . Here we develop a semiclassical approach and investigate the influence of the impact parameter exponential decrease, existing in this model, on the high energy asymptotic behaviour of the scattering ampli…

高能QCD唯象学中的次领头阶BFKL本征函数

High-energy QCD phenomenology with next-to-leading order BFKL eigenfunctions

本文探讨了BFKL核的次领头阶本征函数在高能QCD唯象学中的应用，通过比较两种等价表示，旨在利用NLO本征函数改善高能可观测量的稳定性，并应用于轻矢量介子电产生和Mueller-Navelet喷注产生。

Diffractive beauty photoproduction as a short distance probe of QCD pomeron

High-energy open beauty photoproduction probes the vacuum exchange at distances $\sim 1/m_b$ and detects significant corrections to the BFKL asymptotics coming from the subleading vacuum poles. We show that the interplay of leading and subleading vacuum exchanges gives rise to the cross section $σ^{b\bar b}(W)$ growing much faster than it is prescribed by the exchange of the leading pomeron trajectory with intercept $α_{\Pom}(0)-1=Δ_{\Pom}=0.4$. Our calculations within the color dipole BFKL model are in agreement with the recent determination of $σ^{b\bar b}(W)$ by the H1 collaboration. The co…

Nondiagonal Parton Distributions in the Leading Logarithmic Approximation

In this paper we make predictions for nondiagonal parton distributions in a proton in the LLA. We calculate the DGLAP-type evolution kernels in the LLA, solve the nondiagonal GLAP evolution equations with a modified version of the CTEQ-package and comment on the range of applicability of the LLA in the asymmetric regime. We show that the nondiagonal gluon distribution $g(x_{1},x_{2},t,μ^2)$ can be well approximated at small $x$ by the conventional gluon density $xG(x,μ^2)$. Keywords: Hard Diffractive Scattering, Nondiagonal distributions, Evolution