论文标题
从LHC数据中迈向质子中TMD Gluon密度的全局拟合
Towards the global fit of the TMD gluon density in the proton from the LHC data
论文作者
论文摘要
我们提出了质子中横向动量依赖性（TMD或不整合）的新分析表达。基本现象学参数是从LHC数据中的LHC数据中提取的$ PP $ collisions，低横向动量，$ p_t \ sim 1 $ 〜GEV。后者在修改的软夸克 - 螺旋字符串模型的框架中描述，其中考虑了质子内部parton的gluonic状态和非零横向动量。为了确定在中度和大$ x $上重要的参数，我们使用了LHC的包含$ b $ -JET和HIGGS BOSON生产的测量值以及Proton结构的最新HERA数据$ f_2^c（x，q^2）$和$ f_2^b（x，q^2）$ f_2^b（x，x，q^2）$ and降低了交叉部分$ $ nm $ nm $ nm nm red}^{c}（x，q^2）$和$σ_ {\ rm red}^{b} {b}（x，q^2）$。 Catani-Ciafaloni-Fiorani-Marchesini进化方程式用于将初始Gluon分布扩展到整个运动区域。我们已经用$χ^2/d.o.f来同时描述所有考虑的过程。 = 2.2 $，从而从对撞机数据中向前迈向TMD Gluon密度的全局拟合。质子中获得的TMD GLUON分布可用于公共用法，并将其实施到TMDLIB软件包和蒙特卡罗事件发生器Pegasus中。
We propose a new analytical expression for the Transverse Momentum Dependent (TMD, or unintegrated) gluon density in the proton. Essential phenomenological parameters are extracted from the LHC data on inclusive hadron production in $pp$ collisions at low transverse momenta, $p_T \sim 1$~GeV. The latter are described in the framework of modified soft quark-gluon string model, where gluonic state and non-zero transverse momentum of partons inside the proton are taken into account. To determine the parameters important at moderate and large $x$ we used measurements of inclusive $b$-jet and Higgs boson production at the LHC as well as latest HERA data on proton structure functions $F_2^c(x, Q^2)$ and $F_2^b(x, Q^2)$ and reduced cross sections $σ_{\rm red}^{c}(x,Q^2)$ and $σ_{\rm red}^{b}(x,Q^2)$. The Catani-Ciafaloni-Fiorani-Marchesini evolution equation is applied to extend the initial gluon distribution into the whole kinematical region. We have achieved simultaneous description of all considered processes with $χ^2/d.o.f. = 2.2$, thus moving forward to the global fit of TMD gluon density from collider data. The obtained TMD gluon distribution in a proton is available for public usage and implemented into the TMDlib package and Monte-Carlo event generator PEGASUS.
