Associated production of Z bosons and b-jets at the LHC in the combined kT + collinear QCD factorization approach

被引：0

作者：

Baranov, S. P. ^{[1
]}

Jung, H. ^{[2
]}

Lipatov, A. V. ^{[3
,4
]}

Malyshev, M. A. ^{[3
]}

机构：

[1] PN Lebedev Phys Inst, Moscow 119991, Russia

[2] DESY, Notkestr 85, Hamburg, Germany

[3] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia

[4] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2017年 / 77卷 / 11期

关键词：

SMALL-X PHENOMENOLOGY; INITIAL-STATE RADIATION; HEAVY-QUARK PRODUCTION; PERTURBATION-THEORY; QCD COHERENCE; DISTRIBUTIONS; PROSPECTS; MODEL;

D O I：

10.1140/epjc/s10052-017-5369-5

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 consider the production of Z bosons associated with beauty quarks at the LHC using a combined k(T) + collinear QCD factorization approach, which interpolates between small x and large x physics. Our consideration is based on the off-shell gluon-gluon fusion subprocess g*g* -> ZQ (Q) over bar at the leading order O(alpha alpha(2)(s)) (where the Z boson further decays into a lepton pair), calculated in the k(T)-factorization approach, and several subleading O(alpha alpha(2)(s)) and O(alpha alpha(3)(s)) subprocesses involving quark-antiquark and quark-gluon interactions, taken into account in conventional (collinear) QCD factorization. The contributions from double parton scattering are discussed as well. The transverse momentum dependent (or unintegrated) gluon densities in a proton are derived from Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. We achieve reasonably good agreement with the latest data taken by CMS and ATLAS Collaborations. The comparison of our results with next-to-leading-order pQCD predictions, obtained in the collinear QCD factorization, is presented. We discuss the uncertainties of our calculations and demonstrate the importance of subleading quark-involving contributions in describing the LHC data in the whole kinematic region.

引用

页数：8

共 19 条

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