Collinear and TMD quark and gluon densities from parton branching solution of QCD evolution equations

被引：88

作者：

Hautmann, F. ^{[1
,2
,3
]}

Jung, H. ^{[4
]}

Lelek, A. ^{[4
]}

Radescu, V. ^{[5
]}

Zlebcik, R. ^{[4
]}

机构：

[1] Rutherford Appleton Lab, Chilton OX11 0QX, England

[2] Univ Oxford, Oxford OX1 3NP, England

[3] Univ Antwerp, B-2020 Antwerp, Belgium

[4] DESY, D-22603 Hamburg, Germany

[5] CERN, CH-1211 Geneva 23, Switzerland

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2018年 / 01期

关键词：

QCD Phenomenology; HIGH-ENERGY FACTORIZATION; MONTE-CARLO SOLUTIONS; TRANSVERSE-MOMENTUM DISTRIBUTION; 3-LOOP SPLITTING FUNCTIONS; DEEP-INELASTIC SCATTERING; LEADING LOGARITHMIC ORDER; INITIAL-STATE RADIATION; SEMIINCLUSIVE PROCESSES; JET CALCULUS; W-BOSON;

D O I：

10.1007/JHEP01(2018)070

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study parton-branching solutions of QCD evolution equations and present a method to construct both collinear and transverse momentum dependent (TMD) parton densities from this approach. We work with next-to-leading-order (NLO) accuracy in the strong coupling. Using the unitarity picture in terms of resolvable and non-resolvable branchings, we analyze the role of the soft-gluon resolution scale in the evolution equations. For longitudinal momentum distributions, we find agreement of our numerical calculations with existing evolution programs at the level of better than 1% over a range of five orders of magnitude both in evolution scale and in longitudinal momentum fraction. We make predictions for the evolution of transverse momentum distributions. We perform fits to the high-precision deep inelastic scattering (DIS) structure function measurements, and we present a set of NLO TMD distributions based on the parton branching approach.

引用

页数：29

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